DELAYED ONSET MUSCLE SORENESS (DOMS)

Delayed Onset Muscle Soreness (DOMS) is the muscle pain and stiffness that develops after exercise, usually beginning 12–24 hours after activity, peaking around 24–72 hours, and gradually resolving over several days.

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DOMS is especially common after:

• Starting a new exercise program

• Returning to exercise after a break

• Increasing training intensity or volume

• Performing exercises with a strong eccentric (muscle-lengthening) component

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Causes of DOMS

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DOMS is not caused by lactic acid buildup. Lactic acid is cleared from muscles within hours after exercise.

The current understanding is that DOMS results from:

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Microscopic Muscle Damage

Exercise can create tiny disruptions in muscle fibers and surrounding connective tissue.

This is particularly common during:

• Downhill running

• Lowering weights slowly

• Jumping activities

• High-intensity resistance training

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Inflammatory Response

The body responds to the microscopic damage by:

• Sending immune cells to the area

• Initiating tissue repair processes

This contributes to soreness and stiffness.

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Eccentric Muscle Contractions

DOMS is most strongly associated with eccentric contractions, where a muscle lengthens while producing force.

Examples:

• Lowering a dumbbell during a bicep curl

• Descending stairs

• Running downhill

• Lowering into a squat

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Symptoms of DOMS

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Muscle Soreness

The hallmark symptom is:

• Tender, aching muscles

• Pain when moving or using the affected muscles

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Stiffness

You may notice:

• Reduced flexibility

• Difficulty moving normally

• Feeling "tight" after resting

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Tenderness to Touch

Affected muscles may be:

• Sensitive when pressed

• Tender during massage

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Temporary Weakness

DOMS can cause:

• Reduced strength

• Reduced power output

• Fatigue during exercise

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Mild Swelling

Some people experience:

• Slight swelling

• A feeling of fullness in the muscle

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Reduced Range of Motion

Because of soreness and stiffness:

• Joints may not move as freely

• Certain movements may feel uncomfortable

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Typical Timeline

Time After ExerciseWhat Happens

During exercise Little or no soreness

12–-24 hours Soreness begins

24–-72 hours Peak soreness

3–7 days Gradual recovery

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The exact timing varies depending on training intensity and individual recovery.

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Common Examples

After Leg Day

• Sore quadriceps after squats

• Sore hamstrings after deadlifts

• Sore calves after running

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After Returning to Exercise

Someone returning to the gym after weeks or months off often experiences significant DOMS.

 

After New Activities

Examples:

• Skiing

• Hiking

• Rock climbing

• Rowing

• CrossFit-style workouts​

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DOMS vs. Injury

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DOMS Usually Causes:

• Symmetrical soreness

• Muscle tenderness

• Gradual onset (hours later)

• Improvement within several days​

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Injury May Cause:

• Sharp pain

• Immediate pain during activity

• Significant swelling or bruising

• Pain in joints, ligaments, or tendons

• Symptoms that worsen rather than improve

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When to Seek Medical Attention

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DOMS is usually harmless, but seek medical care if you experience:

• Severe swelling

• Extreme weakness

• Dark or cola-colored urine

• Severe pain that is out of proportion to the workout

These symptoms can occasionally indicate a serious condition called Rhabdomyolysis.

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What Helps DOMS

Evidence suggests the following may help reduce discomfort:

• Light activity (walking, cycling)

• Gentle stretching

• Adequate sleep

• Good hydration

• Proper nutrition, especially sufficient protein

• Sports massage or massage therapy

• Gradual progression of training load

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The good news is that as your body adapts to an exercise, the same workout usually causes much less soreness in the future. This is known as the repeated-bout effect, where muscles become more resistant to DOMS after they've been exposed to a particular type of exercise.