Sudden muscle stiffness and pain are mainly considered to be related to prolonged ischemia, overexertion, trauma, and neurological lesions. Generally need to check first to clarify the specific cause, and then targeted treatment, to prevent the late impact on muscle function, triggering motor dysfunction. 1, prolonged ischemia: If the muscle is cold, poor posture, resulting in muscle pressure, easy to prompt the muscle prolonged ischemia, producing symptoms of sudden muscle stiffness and pain. You can appropriately change the body posture, hot compress, massage, consider also through aspirin, Maizi Ling and other drugs for treatment, improve local blood circulation; 2, overwork: if the body is overactive, muscle contraction frequently, can secrete more lactic acid, lactic acid accumulation in the muscle tissue, there will be swelling, sudden stiffness and pain performance. Should be appropriate rest, avoid excessive activity, but also hot compresses, massage, in order to relax the local muscles, to promote lactic acid subsidence; 3, trauma: if the muscle by the impact of external forces, resulting in local injury or sports strains, usually easy to cause an increase in tissue exudate, stimulate muscle tissue, causing muscle tissue contraction spasm, the symptoms of sudden muscle stiffness and pain, can be accompanied by swelling problems, it is recommended to consider Treatment by magnetic heat therapy with massage and stretching, also can use tizanidine, ethylprednisolone and other drugs to relieve muscle spasm symptoms; 4, neurological lesions: if there are central nervous system lesions, resulting in abnormal nerve discharges, epilepsy symptoms, resulting in increased muscle tone, easy to trigger the symptoms of sudden muscle stiffness, pain, can also be accompanied by convulsions, loss of consciousness phenomenon. Consider drugs such as carbamazepine and phenytoin sodium for antiepileptic treatment as prescribed by the doctor. After the symptoms of the muscles are relieved, pay attention to proper exercise to maintain the function of the muscles and prevent the life from being affected later. Usually warm-up activities should be done before exercise to prevent injury to the soft tissues of the muscles.