Occasional cramps in the body are mainly due to localized muscle dysfunction, resulting in involuntary spasms and contractions that produce the sensation of cramping. It may be accompanied by local pain as well as functional disorders. The common causes are as follows: First, muscle diseases including injury, strain, muscle mass, and local compression can lead to muscle dysfunction and cramps. Second, it can be seen in local poor blood circulation, such as local acute trauma, local cold, local vasculitis, vascular injury, etc., which can lead to relative ischemia and hypoxia in local muscles, thus leading to dysfunctional symptoms of cramps. Thirdly, local nerve problems, such as nerve injury, nerve inflammation stimulation to produce the corresponding functional abnormalities, nerve trunk travel area with the corresponding compression and irritation, such as swelling. Nerve root compression and irritation, such as lower extremity cramps, may be caused by lumbar disc herniation resulting in compression of the sciatic nerve root in the lower extremity. In addition, some systemic diseases may also cause cramps, such as low potassium and calcium, malnutrition, water and sodium retention, renal insufficiency, and heart failure, which may affect the internal environment of the body and cause local muscle dysfunction.