Health information to help you understand symptoms. It isn't a diagnosis.
Check symptoms

Muscle pain after activity

Also called: Sore muscles, DOMS, muscle strain, pulled muscle

Muscle pain after activity is common, especially after a new or harder workout. Soreness that starts a day or two later (delayed-onset muscle soreness) usually fades in a few days. Sudden sharp pain may be a strain. Severe pain with weakness and dark, cola-colored urine is an emergency (rhabdomyolysis).

Common causesOveruse, new exercise, muscle strain
Usually serious?Usually not
Get checked ifThere's dark urine, severe swelling, or it doesn't improve in a week
If you think it's an emergency, call 911.Thinking about suicide? Call or text 988.

Overview

Delayed-onset muscle soreness (DOMS) happens when muscles work harder than they're used to, causing tiny injuries. It peaks 1 to 3 days after exercise and gets better on its own.

A strain (pulled muscle) causes sudden pain during activity, sometimes with bruising or swelling. Rarely, very intense exercise, heat, or certain medicines can break down muscle tissue (rhabdomyolysis), which can harm the kidneys.

When to get medical care

Call 911Severe muscle pain and weakness with dark, cola-colored urine or very little urine. Muscle pain with chest pain or shortness of breath.
Get care todaySevere swelling, or a muscle that's very tight, tender, and numb (possible compartment syndrome). Sudden pain with a pop and you can't use the muscle. Muscle pain with a red, warm, swollen area or fever.
See a doctor soonSoreness that doesn't improve after a week. Muscle pain after starting a new medicine, like a statin. Pain that keeps coming back with the same activity.

Causes

Common causes include delayed-onset muscle soreness, overuse, muscle strains, cramps, and dehydration. Other causes include rhabdomyolysis, compartment syndrome, statins and other medicines, low potassium or other electrolyte problems, and an underactive thyroid.

OwieClear has pages on 2 conditions that can cause muscle pain after activity. Each shows how soon to get care.

Common causes

What you can do at home

  • Rest the sore muscles, but keep moving gently.
  • Use ice for the first day or two after a strain, then heat.
  • Stretch gently and try massage.
  • Drink plenty of water.
  • Build up exercise slowly, increasing by no more than about 10% a week.
  • Warm up before and cool down after exercise.

Medicines

Acetaminophen (Tylenol) or ibuprofen (Advil, Motrin) can ease soreness. Don't take ibuprofen if you have dark urine or might be dehydrated. Tell your provider if you think a medicine is causing muscle pain.

At the doctor

The provider will check for a strain or muscle breakdown.

Questions you may be asked

  • What activity you did and when the pain started
  • Whether pain came on suddenly
  • Urine color
  • Swelling, weakness, or numbness
  • Your medicines

The exam

A physical exam of the muscles and strength.

Tests

  • Blood test for muscle damage (CK)
  • Urine test
  • Kidney function tests
  • An ultrasound or MRI for strains

Prevention

You can lower your risk.

  • Build up exercise gradually
  • Warm up and stretch
  • Drink fluids, especially in heat
  • Rest between hard workouts

Check your symptoms

Most symptoms have more than one possible cause. The symptom checker looks at all of your symptoms together, plus your age, and shows how soon to get care.

Start the symptom checker

Sources

Last updated 2026-11-13.