Lactic acid buildup, infections, and muscle strains can cause muscle pain, and depending on the cause, physical and medication treatments can be given. The details are as follows: 1. Lactic acid accumulation: after excessive exercise, the muscles carry out anaerobic respiration, which can lead to the accumulation of lactic acid, thus causing muscle pain. Physical therapy such as hot compress massage can accelerate blood circulation, promote lactic acid subside, and alleviate the symptoms of muscle pain. 2. Infection: when the skin is broken, it can lead to muscle infection by bacteria and other infections, causing muscle pain, the treatment needs to apply amoxicillin and other antimicrobial drugs, when the pain is serious, apply ibuprofen and other painkillers. 3. Muscle strain: sudden intense, large amount of exercise, can lead to muscle damage due to pulling, resulting in muscle pain symptoms, can be used externally to apply Futenugreek ointment and other drugs to the affected area, pain can be added when the pain is severe, such as acetaminophen and other drugs. Muscle pain may also have other causes, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment. All of the above drugs should be applied under the guidance of a physician, not unauthorized use of drugs.