What is delayed onset muscle soreness and when does it happen?

Delayed onset muscle soreness is actually a very common problem where athletes or people that are involved in physical activities will end up with pain where the body is sore after any type of what we call eccentric exercise, where any time you're lengthening the muscle and putting a force on that muscle will cause the muscle strain. That will lead to delayed onset muscle soreness. Typically, delayed onset muscle soreness occurs about 24 to 48 hours after the physical activity and usually lasts around three to five days.