The most frequent cause of muscle pain post exercise is due to muscle repair. If you notice your muscle pain is delayed by 24-48 hours – or it gets worse over this time, you are likely experiencing delayed onset muscle soreness (also known as DOMS). When you exercise under resistance, your muscles undergo micro-trauma. This means small tears are created in the muscles. When the body repairs these tears, it helps you become stronger. The body adjusts and adapts. However, it may at first appear as soreness or muscle pain post exercise. This type of pain should resolve within 72 hours.
If your pain does not subside during this time, your muscle pain post exercise may be caused by injury. Injury during exercise is caused by too much, too soon, overuse, or improper biomechanics or form. The most common injuries include muscle strain and tendonitis. These injuries can occur almost anywhere in the body and having varying recovery times and severities.