Muscle soreness after a workout can usually be relieved by massaging heat packs and ice packs. There are three common causes of post-workout muscle soreness: lactic acid buildup, delayed muscle soreness and muscle strains, which are handled accordingly for different situations. 1. Lactic acid accumulation: because of excessive exercise caused by poor local blood circulation, the accumulation of lactic acid in the body, there will be muscle soreness, this situation can be done by doing hot packs, massage and other methods. This promotes local blood circulation, is conducive to relieving soreness, generally 2 to 3 hours after the symptoms of significant relief. 2. Delayed muscle soreness: because the exercise is not fully warmed up before, the muscles are not completely relaxed, so the exercise will cause muscle fatigue, which occurs muscle soreness, generally through 3 to 5 days of rest, physical therapy, the symptoms can be reduced. 3. Muscle strain: Exercise too much or the wrong way, resulting in muscle strain, manifested as localized swelling and pain. You can reduce the swelling by applying ice packs, using Yunnan Baiyao aerosol, and recuperating for 2 to 3 weeks. The above drugs should be used under the guidance of a doctor, avoid self-medication.