Muscle Strains: What They Are, Why They Happen and How to Best Treat Them
Updated: 5 days ago
We have all felt them!!
We have all heard the term. And many of us have either been diagnosed with a muscle strain or, at some point, assumed that we had one. Whether you sit all day at a desk in downtown Manhattan, roam the streets of NYC for hours with your dog, run for miles in Central Park or ride your bike up the west side highway to escape the city noise, muscle strains affect New Yorkers and non-New Yorkers alike.
But what exactly is a muscle strain? Is a pulled muscle the same thing as a strain? What about a muscle tear? What's the difference between a strain and a sprain? And if you do strain a muscle, should you rest it, stretch it, massage it, strengthen it, ice it, heat it, or just leave it alone?
All of these questions can become confusing because the terms are often used interchangeably, but they don't all mean exactly the same thing. After more than two decades of treating orthopedic injuries, working with athletes, and helping people return to exercise, I have seen just about every version of a muscle strain—from the recreational runner who feels a sudden pull in the hamstring to the weightlifter who strains a pec to the person who simply wakes up sore and assumes they must have "pulled something."
That last example is important because not every painful muscle is a muscle strain. Sometimes it is delayed-onset muscle soreness. Sometimes it is a spasm or trigger point. Sometimes it is tendon-related. And sometimes pain is being referred from somewhere else entirely. A true muscle strain involves actual injury to muscle fibers.
So let's clear up the terminology first and then get deeper into what actually matters: why muscle strains happen, how severe they are, how the healing process changes from the acute to subacute and chronic phases, how they should be rehabilitated, and where treatments such as Active Release Techniques® can fit into that process.
What Is a Muscle Strain?
A muscle strain occurs when muscle fibers are overstretched or exposed to more force than they can tolerate, resulting in damage to some portion of those fibers. To understand why that happens, think about what muscles are constantly being asked to do. They produce force by contracting, lengthening, shortening, and absorbing force. During many athletic movements, they also have to produce force while simultaneously lengthening.
That last part is especially important. This is called an eccentric contraction. Imagine sprinting. Your hamstrings are working extremely hard to control the movement of your leg while rapidly lengthening. Or imagine lowering a heavy dumbbell during a biceps curl. Your biceps are lengthening, but they are still producing force to control the weight.
These situations can place tremendous mechanical stress on muscle tissue. When the force becomes greater than the tissue can tolerate, some of the muscle fibers can become damaged. That is a strain. The injury often occurs around the musculotendinous or myotendinous junction, where muscle transitions toward tendon, although strains can occur elsewhere within muscle tissue.
Is a Muscle Strain the Same as a Pulled Muscle?
Basically, yes. "Pulled muscle" is the everyday term.
"Muscle strain" is the more clinical term.
If somebody tells me: "Mark, I think I pulled my hamstring", they are essentially telling me they think they strained it. But whether they actually strained the hamstring is another question. That requires assessment.
What's the Difference Between a Muscle Strain and a Muscle Tear?
This is another source of unnecessary confusion. A strain is a form of tearing of muscle fibers. The difference is really about severity. A mild strain may involve relatively minor fiber damage, a moderate strain involves more significant tissue disruption, and a severe strain can involve extensive or complete rupture.
So when someone says, "It's not torn. It's only strained," that is not technically the best distinction. The more useful question is: How much tissue has been damaged? That is where grading becomes important.
What's the Difference Between a Strain and a Sprain?
This one is easy to remember: strain = muscle or musculotendinous tissue, while sprain = ligament. Ligaments connect bone to bone and help stabilize joints, while muscles create and control movement.
If you damage the fibers of your hamstring, that is a strain. If you roll your ankle and damage the ligaments supporting the ankle joint, that is a sprain. Both can involve pain, swelling, and bruising, but they involve different tissues. That means their evaluation and rehabilitation are not necessarily the same.
How Do Muscle Strains Happen?
There are a lot of circumstances that can lead to a strain, but the basic issue is relatively simple: the force being placed on the muscle exceeds the tissue's current ability to tolerate it.
That can happen suddenly. You sprint after not sprinting for six months. You slip and your leg gets forced into an extreme position. You attempt a heavy lift or explosively change direction. In each case, the muscle is suddenly exposed to a demand greater than its current capacity.
A strain can also develop in the setting of repeated overload. Fatigue can accumulate, training volume can become excessive, recovery may be inadequate, or a previous injury may not have been fully rehabilitated. Eventually, one final movement becomes the proverbial straw that breaks the camel's back.
Sports and Explosive Movement
Muscle strains are extremely common in sports involving:
Sprinting
Jumping
Rapid acceleration
Deceleration
Cutting
Kicking
Throwing
Explosive lifting
That is why we see so many hamstring, quadriceps, groin and calf strains in athletes. These muscles are being asked to produce large amounts of force very quickly.
Strength Training
Bodybuilders and strength athletes are certainly not immune.
A muscle can be strained while:
Squatting
Deadlifting
Bench pressing
Performing heavy rows
Sprinting
Performing explosive movements
The issue is not that these exercises are inherently dangerous. The issue is whether the tissue is prepared for the load. That is an important distinction because
load isn't the enemy!!
Properly applied load is actually how we make muscles stronger. The problem occurs when demand exceeds capacity.
Previous Injuries Matter
One of the first questions I ask somebody with a suspected muscle strain is:
"Have you injured this muscle before?"
Why?
Because previous injury can matter tremendously. The number one risk for injury is previous injury to that structure.
A muscle may become pain-free without completely regaining:
Strength
Range of motion
Endurance
Tissue capacity
Confidence
Neuromuscular control
Then the person returns to the same activity that caused the original problem.
This is particularly important with athletes. Being able to walk around without pain does not necessarily mean your hamstring is ready for an all-out sprint. Being able to perform a bodyweight squat does not automatically mean your quad is ready for heavy training. Pain-free is not the same thing as fully rehabilitated.
Is It Really a Muscle Strain?
This is where things get interesting. People use "muscle strain" to describe almost any muscular pain, but several other problems can feel similar. Knowing the difference matters because treating every painful muscle as if it were torn is just as problematic as ignoring a genuine tear.
Delayed-Onset Muscle Soreness
DOMS typically develops after unfamiliar or challenging exercise. You train legs hard, feel okay the next morning, and then 24 to 48 hours later, stairs suddenly become your mortal enemy.
That is not necessarily a muscle strain. DOMS generally affects a broader area and appears after the workout rather than as one sudden injury event.
Muscle Spasm
A muscle spasm is an involuntary contraction. It can be extremely painful. But the fact that a muscle spasms does not automatically mean fibers have torn.
Trigger Points
Trigger points can produce localized tenderness and referred pain. Again: Pain does not automatically equal tissue tearing.
Tendon Problems
Pain close to where a muscle attaches can sometimes involve a tendon rather than the muscle itself. This distinction matters because tendon rehabilitation can be different from muscle-strain rehabilitation.
This is exactly why assessment matters. We need to determine what tissue is actually involved before deciding how it should be treated.
Common Signs and Symptoms of a Muscle Strain
A true muscle strain often has a fairly recognizable story. The person may describe a sudden:
Pull.
Grab.
Snap.
Sharp pain.
Sometimes they know the exact repetition or step when it happened.
Common symptoms may include:
Localized pain
Tenderness
Weakness
Pain when contracting the muscle
Pain when stretching it
Swelling
Bruising
Reduced range of motion
Difficulty using the injured muscle
The severity depends largely on the grade of the injury.
Grade 1 Muscle Strain
A Grade 1 strain is the mildest category. A relatively small portion of muscle fibers has been injured. The person usually still has substantial function.
You may feel:
Local soreness
Mild tightness
Tenderness
Pain with certain movements
Mild weakness
You may still be able to walk, exercise or perform everyday activities.
That does not mean you should ignore it. One of the easiest ways to turn a small injury into a larger one is to think, "It isn't that bad. I'll just train through it." You then repeatedly load tissue that is not ready for the demand being placed on it. A Grade 1 injury may heal relatively quickly, but appropriate progression still matters.
Grade 2 Muscle Strain
A Grade 2 strain involves greater damage to the muscle fibers.
Symptoms are generally more noticeable.
You may experience:
Greater pain
Swelling
Bruising
Clear weakness
Reduced range of motion
Difficulty performing the activity that caused the injury
This is the category where people can get themselves into trouble because the injury may not look catastrophic. You can sometimes still use the muscle, but its capacity has been significantly reduced. Trying to return too aggressively can increase the risk of reinjury. Grade 2 strains generally require a much more deliberate rehabilitation process than mild Grade 1 injuries.
Grade 3 Muscle Strain
A Grade 3 strain is severe. There may be extensive or complete disruption of the muscle. In other words, it is a mostly or fully torn muscle.
Symptoms can include:
Severe pain at the time of injury
Significant weakness
Swelling
Bruising
Loss of function
Visible or palpable deformity in some cases
Inability to properly use the muscle
This is not something I recommend trying to diagnose and treat on your own. A severe suspected muscle tear needs appropriate medical evaluation. Imaging may be required, and some complete ruptures may require surgical consultation depending on the muscle, location, and individual circumstances.
Photos from Downtown Physical Therapy NYC
Muscle Strain Recovery Happens in Phases
A muscle strain should not necessarily be treated the same way aon Day 1 as it is on Day 10 or Week 6. The tissue changes, the goals change, and treatment needs to change with them.
For simplicity, I like to think about recovery in three broad phases: acute, subacute, and chronic/remodeling/return to function. These phases overlap because biology does not suddenly flip a switch from one stage to another. But thinking in phases helps us understand why treatment needs to progress.
The Acute Phase
Immediately after a muscle strain, the body begins responding to the injury. Pain, swelling, and sometimes bruising may develop. This is not the time to prove how tough you are. The first thing to do is stop the activity that caused the injury. Continuing to sprint on a newly strained hamstring is obviously not going to help.
Protecting the injured tissue
Managing pain
Avoiding unnecessary aggravation
Maintaining safe movement when appropriate
Determining the severity of the injury
If you cannot bear weight, cannot use the muscle, have major swelling or bruising, notice a deformity or experienced a significant traumatic event, seek professional medical evaluation.
Should You Stretch a Fresh Muscle Strain?
This is where people frequently make a mistake. The muscle feels tight, so naturally they want to stretch it. But remember: a strain involves damaged muscle fibers.
Aggressively pulling those fibers apart immediately after an injury does not automatically make sense. Gentle, pain-free movement may be appropriate, but aggressive stretching is a completely different thing. The treatment needs to match the stage of healing.
The Subacute Phase
As the initial pain and inflammatory response begin to settle, the focus gradually changes. Now we want to restore appropriate movement and begin rebuilding the muscle's capacity.
This may include:
Controlled range-of-motion exercises
Progressive mobility
Gentle strengthening
Gradually increasing load
Addressing surrounding restrictions
Correcting relevant compensations
This is where rehabilitation becomes extremely important. The muscle needs load, but it needs the right amount of load at the right time. Too little and you may fail to restore capacity. Too much too soon and you may reinjure the tissue.
This is the art and science of rehabilitation.
The Chronic and Remodeling Phase
Eventually the question changes from:
"How do we protect this muscle?" to: "How do we prepare this muscle to do its job again?"
If you are a runner, the hamstring eventually needs to tolerate running.
If you play soccer, it needs to tolerate sprinting, cutting and kicking.
If you are a bodybuilder, it needs to tolerate resistance training.
If you work a physical job, it needs to tolerate your work.
This is where progressive strengthening becomes critical.
The rehabilitation may involve:
Progressive resistance
Eccentric strengthening
Full-range strength
Sport-specific movements
Speed
Power
Endurance
Gradual return to activity
The exact program depends on the muscle, injury severity and individual.
Why Eccentric Strength Matters
Eccentric exercise involves producing force while a muscle lengthens. Think about slowly lowering a dumbbell during a curl or controlling the lowering phase of a Romanian deadlift.
Eccentric strength is particularly relevant because many muscle strains occur while muscles are producing force in lengthened positions. As rehabilitation progresses, gradually rebuilding the muscle's ability to tolerate these forces can become extremely important.
But again, timing matters. You do not go from a fresh Grade 2 strain to maximum-load eccentric training overnight. Rehabilitation is progression.
Treat the Injury But Look at the Entire Kinetic Chain
Suppose you strained your hamstring. Of course I am interested in the hamstring But I am also interested including your glute muscles strength, pelvic alignment, running mechanics, ankle mobility and much more.
Why?
Because the hamstring may not have been working in isolation when it became injured. Maybe it was compensating. Maybe another structure was restricted. Maybe the hamstring did not have enough strength for the demand being placed on it.
The body is intimately connected and learns how to compensate for movement deficiencies in one area by overusing and overtensioning other areas. Hamstring strains stemming from inactive glute muscles in one or the best examples of this phenomenon anywhere in the human body.
How Long Does a Muscle Strain Take to Heal?
This is probably the question everybody wants answered, and unfortunately, it depends. But here are some basic time-frames.
A mild Grade 1 strain may improve relatively quickly, generally in 1 to 3 weeks.
A moderate Grade 2 strain can take considerably longer. This can range anywhere from 1 to 4 months and often times depends on the muscle and on the sport or activity that the individual is trying to get back to. Hamstrings, for example, are notoriously stubborn compared to the the quadriceps muscles. So while there is a lot of variation, the generally accepted timeframe is 1 to 4 months.
A severe Grade 3 injury may require months of rehabilitation and, in certain situations, surgical management. This can mean 2 to 6 months and longer.
Recovery depends on:
Injury severity
Muscle involved
Location of the injury
Previous injuries
Age
Overall health
Training demands
Rehabilitation
Whether the tissue is repeatedly reinjured
The bigger mistake is trying to force the body into somebody else's timeline. I care much more about function than an arbitrary date. Can you move through the required range? Is strength returning? Can the muscle tolerate progressive load?
Can you perform the movements required for your sport or activity?
Those are better questions.
How Do You Know When You're Ready to Return?
Being pain-free while sitting on the couch is not the standard. Return to activity should be based on the demands of the activity.
For a runner, that may involve progressing from:
Walking → jogging → running → faster running → sport-specific speed.
For a strength athlete:
Bodyweight movement → light resistance → moderate resistance → heavier training.
For an athlete:
Basic movement → strength → speed → change of direction → full practice → competition.
The exact progression depends on the injury. But the principle is the same.
You earn your way back.
How Can You Reduce Your Risk of Another Muscle Strain?
You cannot prevent every strain.
But you can improve your odds.
Build Strength
Stronger muscles generally have greater capacity to tolerate load. Strength training should be progressive and appropriate for the person's activity.
Warm Up Properly
Going from sitting all day to maximal sprinting is not an intelligent transition. Gradually prepare the tissues for the activity you are about to perform.
Progress Training Gradually
One of the easiest ways to get injured is doing too much too soon.
Mileage.
Speed.
Weight.
Volume.
Intensity.
All of these create stress. Give your body time to adapt.
Respect Fatigue
Technique changes when you are exhausted. Force production changes.
Coordination changes. Recovery matters.
Finish Your Rehabilitation
This one is huge. Do not stop rehabilitation simply because the pain disappeared.
Restore:
Strength
Range
Endurance
Control
Sport-specific capacity
That is how you turn recovery into injury prevention.
When Should You See a Professional?
Seek appropriate professional evaluation if you have:
Significant swelling
Extensive bruising
Severe pain
Inability to bear weight
Major weakness
A visible deformity
Numbness or neurological symptoms
Inability to use the muscle normally
Symptoms that are getting worse rather than better
And even with a milder injury, if you keep "straining" the same muscle repeatedly, there is probably a reason.
That deserves investigation.
How I Approach Muscle Strains at On Your Mark
When somebody comes to me with a muscle strain, I am not just interested in making the injured muscle feel better. I want to know why it happened and what needs to happen before that person returns to activity.
First, we determine what we are actually dealing with.
Is this really a strain?
What grade does it appear to be?
What phase of healing are we in?
What movements are limited?
Where is the weakness?
What activity does the client need to return to?
Then treatment progresses accordingly. Depending on the stage of healing, that may involve:
Active Release Techniques
Other manual therapy
Mobility work
Strengthening
Corrective exercise
Progressive return to activity
The treatment should evolve as the injury evolves. That is the key. The treatment that makes sense three days after an injury is not necessarily the treatment that makes sense six weeks later.
ART and Exercise Work Together
This is one of the most important principles in my practice: ART can help restore movement, while exercise helps restore capacity. The two approaches serve different but complementary purposes within rehabilitation.
Let's say ART helps improve the range of motion around a previously strained hamstring. Great. Now the hamstring needs to become strong through that range. It needs to tolerate load, and eventually it may need to tolerate speed.
If we only make the muscle feel better but never rebuild its capacity, we have not completed rehabilitation. This is why I do not view ART and exercise as competing treatments. They complement each other. The hands-on treatment can address restrictions, while exercise teaches the body what to do with the improvement.
Can Massage or ART Break Up Scar Tissue?
This phrase gets used constantly in manual therapy, and we need to be careful with what it means. Scar tissue is part of normal healing. Your body needs repair tissue, so the goal is not to somehow erase every bit of scar tissue from an injured muscle.
The more useful clinical question is whether the healing tissue and surrounding structures are allowing normal movement and function. ART is designed to identify restrictions within and between soft tissues and address how those tissues move.
That is more useful than thinking, "Scar tissue is bad, so let's destroy it." Healing tissue is necessary. What we want is functional healing.
Where Active Release Techniques Fits Into Muscle-Strain Recovery
As an experienced Active Release Techniques® provider, this is an area I pay very close attention to. ART can be an extremely valuable component of muscle-strain rehabilitation, but how I use ART depends on where the person is in the healing process.
ART is not about attacking a newly injured muscle as aggressively as possible. It is about applying the appropriate treatment to the appropriate tissue at the appropriate stage.
That distinction matters.
Why ART Makes Sense for Muscle Injuries
ART is a highly specific, movement-based manual therapy system. Rather than generically massaging an entire muscle group, ART allows me to identify and treat specific muscles and soft-tissue relationships. During treatment, I establish a precise manual contact and move the tissue through an appropriate range.
This can be particularly useful as a muscle strain heals and we begin working to restore normal:
Tissue movement
Muscle length
Range of motion
Function
ART also allows me to look beyond the injured muscle itself. And this is extremely important.
Final Thoughts: Don't Just Wait for a Muscle Strain to "Go Away"
Muscle strains are extremely common, but common does not mean simple. A true muscle strain involves actual damage to muscle tissue, and the severity can range from a relatively minor Grade 1 injury to a major Grade 3 rupture.
Understanding that difference matters. Understanding the phase of healing matters. And understanding that pain relief is not the same thing as complete rehabilitation matters even more.
The goal should not simply be, "My hamstring doesn't hurt anymore." The better standard is: "My hamstring has regained the movement, strength, and capacity it needs for what I want to do." That is a very different standard.
Active Release Techniques can be an extremely powerful part of this process because ART allows me to address specific soft-tissue restrictions while incorporating movement directly into treatment. But I do not use ART in isolation. As the tissue heals, we restore movement, then strength, then capacity, and finally the specific demands of the person's life or sport.
After more than two decades of treating orthopedic injuries, this is one of the most important lessons I can give you: do not simply chase the pain. Figure out what was injured, understand why it happened, respect the healing process, restore movement, rebuild strength, and then progressively prepare the tissue to handle whatever you are asking it to do again.
That is how you recover from a muscle strain. And, just as importantly, that is how you give yourself the best opportunity to keep it from happening again.
Frequently Asked Questions About Muscle Strains
Is a pulled muscle the same as a muscle strain?
Yes. "Pulled muscle" is a common term for a muscle strain.
Is a strain the same as a muscle tear?
A strain involves damage or tearing of muscle fibers. The severity of the tear determines the grade of the strain.
What's the difference between a strain and a sprain?
A strain involves muscle or musculotendinous tissue. A sprain involves a ligament.
What are the three grades of muscle strain?
Grade 1 is generally mild, Grade 2 involves more significant partial tissue damage, and Grade 3 represents severe or potentially complete disruption.
Should I stretch a strained muscle?
Aggressive stretching of a newly injured muscle may not be appropriate. Movement and stretching should be progressed according to the severity and phase of healing.
Should I massage a fresh muscle strain?
The timing and intensity of manual therapy matter. Aggressive treatment of a newly injured muscle is not automatically beneficial. Treatment should match the stage of healing.
Can ART help a muscle strain?
Active Release Techniques can be a valuable component of rehabilitation when appropriate, particularly as treatment begins addressing soft-tissue restrictions, mobility and movement. ART should be integrated with progressive rehabilitation rather than viewed as a substitute for rebuilding strength and tissue capacity.
How long does a muscle strain take to heal?
Recovery varies considerably according to injury grade, location, previous injuries, activity demands and rehabilitation. Mild strains may recover relatively quickly, while significant tears can require weeks or months.
How do I know whether I actually strained a muscle?
A true strain often involves a recognizable injury event followed by localized pain, tenderness, weakness and pain when using or stretching the affected muscle. Professional assessment may be needed to distinguish a strain from tendon problems, DOMS, spasms and other causes of muscle pain.
Can I exercise with a muscle strain?
That depends on the severity and phase of healing. Appropriate movement and progressive exercise are often important parts of rehabilitation, but repeatedly loading an injured muscle beyond its current capacity can delay recovery or lead to reinjury.
Why does the same muscle keep getting strained?
Possible factors include incomplete rehabilitation, inadequate strength, previous injury, rapid changes in training load, fatigue and sport-specific demands. Recurrent strains should be properly assessed rather than repeatedly treated as isolated incidents.
When should I get a muscle strain checked?
Seek professional evaluation for severe pain, major swelling or bruising, significant weakness, inability to bear weight or use the muscle, visible deformity, neurological symptoms or symptoms that fail to improve.
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