Calf cramps in middle-aged and old people may be caused by muscle fatigue, calcium deficiency, lumbar disc herniation and other reasons. 1. Muscle fatigue: When middle-aged and elderly people walk for a long time, stand for a long time or exercise strenuously, it may cause muscle fatigue, which may lead to spasm of the calf muscles and cause calf cramps and other symptoms. 2. Calcium deficiency: due to the serious loss of calcium in middle-aged and elderly people, calcium absorption ability decreases, which may lead to calcium deficiency in the body in the long run, triggering osteoporosis, calf cramps and other conditions. 3. Lumbar disc herniation: When a patient suffers from lumbar disc herniation, the nucleus pulposus in the lumbar disc area may compress the spinal nerve root, so that the blood flow in the spinal nerve root decreases, which may cause calf cramps. In addition, cold stimulation, arteriosclerosis of the lower limbs, malnutrition and other reasons may also cause cramps in the calves, it is recommended that the patient consult a doctor in a timely manner to check, and actively cooperate with the doctor’s treatment, pay attention to rest in life, and regular re-examination.