The time it takes for lactic acid buildup to disappear after it has formed is related to an individual’s physical condition and cannot be generalized. Lactic acid buildup is mostly caused by over-exercise, during which the muscles undergo anaerobic fermentation, resulting in incomplete breakdown of glucose. Lactic acid buildup can lead to muscle pain, which usually lasts for 2-3 days. In some people with large amounts of lactic acid buildup or limited transport capacity in the body, the pain will be delayed to 5-6 days, or even about 1 week. A large amount of lactic acid buildup can cause muscle soreness and fatigue. Patients should perform warm-up exercises before exercise, which can be done by massaging and stretching, and warm water shower and massage after exercise, which can regulate blood circulation and accelerate lactic acid metabolism. If the accumulation of lactic acid is more serious, it is necessary to rest for a period of time before reasonable exercise. In daily life, we should keep our mood happy to avoid aggravation of pain due to poor mood. When the symptoms are serious, it is recommended to go to the sports medicine department of the hospital in time for further treatment.