Muscle soreness after training is so common that most people assume it signals a productive workout. But soreness and productive stimulus are not the same thing — and the relationship between them is more complicated than fitness culture suggests. Understanding when soreness is a normal adaptive signal and when it's a warning sign is one of the most practical pieces of knowledge a lifter can have.
6 Reasons You're Always Sore After Workouts (And When Soreness Becomes a Problem)
Delayed onset muscle soreness, or DOMS, is caused by microscopic damage to muscle fibers during exercise, particularly during the eccentric phase — the lowering portion of a movement.
This damage triggers an inflammatory response that peaks 24–48 hours after training and produces the familiar stiffness and tenderness. It is a normal consequence of novel or intense training stimulus.
Reason 1: The exercise is new to your body.
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