Left leg cramps may be caused by physiological reasons such as over-exercise, as well as pathologic reasons such as lumbar spine diseases, electrolyte disorders, and lower extremity vascular diseases. 1. Physiological reasons: the accumulation of lactic acid in the thigh muscles due to overwork, etc., stimulates the muscle tissues around, resulting in cramps in the left leg. 2. Lumbar spine diseases: commonly caused by lumbar disc herniation, lumbar spine slippage and other diseases that compress the nerve root innervating the left leg, causing pain, numbness, cramps and other symptoms in the left leg. 3. Electrolyte disorders: mostly occurring in menopause, menopausal women and adolescents during the growth and development period, the patient’s body loses or needs more calcium, and the patient experiences symptoms of cramps in the left leg. 4. Lower extremity vascular disease: arterial occlusion or venous thrombosis of the lower extremities caused by poor local blood supply, patients with left leg cramps. Left leg cramps may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.