The symptoms of cramps after tired work are mainly due to the following reasons: First, muscle overload after tired work, resulting in muscle strain and injury, which leads to muscle dysfunction, spasm and contraction, resulting in the symptoms of cramps. Second, due to more work, the local movement is greater, resulting in insufficient blood supply, resulting in lack of oxygen and ischemia, which affects the muscle function, easily leading to dysfunction, continuous, uncontrolled spasms and contractions, resulting in cramps. Local hypoxia and ischemia after more work can lead to anaerobic metabolism of local tissues, resulting in the accumulation and stimulation of anaerobic metabolites such as lactic acid. Third, if the patient has malnutrition, such as potassium deficiency, calcium deficiency, etc., and local cold, etc., it will affect the local blood circulation, leading to muscle dysfunction and producing cramps. This situation involves a variety of factors that coexist and affect each other, and can be treated with supportive symptomatic treatment when it occurs. If you have frequent cramps, you must go to the hospital to find the cause.