In a nutshell
After unfamiliar exertion, muscles often do not start hurting until the next day. It is particularly typical after movements in which a loaded muscle lengthens, such as walking downhill. The pain usually fades within a few days.
Why does it happen?
Mechanical strain causes small changes in muscle fibers and surrounding tissue, followed by inflammatory and repair processes. These sensitize pain fibers; leftover lactic acid does not explain delayed muscle soreness.
Frequency
Delayed muscle soreness after unfamiliar exertion is widespread. How often it occurs depends more on the exertion than on a fixed personal trait.
Frequency is a qualitative description, not your individual probability.
Is it normal?
Temporary exertional pain in the worked muscles is typical; the two sides need not be affected equally.
When to seek advice
Dark urine, extreme swelling, severe weakness, or unexpectedly intense pain are emergency signs.
Does this happen to you?
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Sources (1)
- Cleveland Clinic: Delayed Onset Muscle Soreness (opens a new tab)
Explains delayed exercise soreness and distinguishes it from acute injury.
Editorial update: . AI-assisted research and editing; not individually reviewed by a physician. How we research
