What causes doms

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Last updated: April 4, 2026

Quick Answer: DOMS, or Delayed Onset Muscle Soreness, is primarily caused by microscopic tears in muscle fibers that occur during strenuous or unaccustomed physical activity. These tears trigger an inflammatory response, leading to the characteristic pain and stiffness felt 12-72 hours after exercise.

Key Facts

What is DOMS?

Delayed Onset Muscle Soreness, commonly known as DOMS, is a familiar sensation for anyone who has pushed their physical limits. It's that deep ache and stiffness that sets in hours or even days after a particularly challenging workout. While it can be uncomfortable, DOMS is a normal physiological response to exercise, particularly when muscles are subjected to novel or intense stress.

The Science Behind the Soreness

The primary culprit behind DOMS is the damage that occurs to muscle fibers during exercise. When you engage in physical activity, especially movements that involve eccentric contractions – where the muscle lengthens under tension (think of the lowering phase of a bicep curl or running downhill) – tiny tears can form within the muscle tissue. These microscopic tears are not indicative of a serious injury but rather a sign that your muscles have been challenged beyond their current capacity.

Following this micro-damage, the body initiates an inflammatory response. This process involves the release of various chemicals and the influx of immune cells to the affected area. This inflammation, while crucial for the repair and adaptation process, contributes significantly to the pain and tenderness associated with DOMS. The soreness typically peaks between 24 and 72 hours after the inciting event, gradually subsiding as the muscle tissue repairs itself.

Factors Contributing to DOMS

Several factors can increase the likelihood and severity of DOMS:

Is DOMS Harmful?

It's important to distinguish DOMS from acute muscle strains or tears. DOMS is characterized by a dull, aching pain that is felt throughout the muscle, often accompanied by stiffness and a temporary reduction in strength. The pain is usually exacerbated by movement and palpation (touching the sore muscle). Acute injuries, on the other hand, tend to be sharper, more localized, and often occur suddenly during the activity itself, sometimes accompanied by swelling or bruising.

While DOMS is not harmful, it can be a signal from your body that you've pushed yourself significantly. It's a sign that your muscles are undergoing adaptation and will likely become stronger and more resilient after they recover. Pushing through severe DOMS, however, can increase the risk of actual injury.

Managing and Preventing DOMS

While it's difficult to completely prevent DOMS, especially when starting a new training program or increasing intensity, there are strategies to manage and potentially reduce its severity:

In conclusion, DOMS is a natural consequence of challenging your muscles. Understanding its causes and implementing smart training and recovery strategies can help you navigate this discomfort and continue progressing towards your fitness goals.

Sources

  1. Delayed onset muscle soreness - WikipediaCC-BY-SA-4.0
  2. Muscle soreness - NHSfair-use
  3. Muscle soreness: How to ease discomfort - Mayo Clinicfair-use

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