Leg cramps may be caused by cold legs, calcium deficiency, lumbar disc herniation and obstruction of venous return. 1. Cold legs: If the living environment is too cold, and you fail to keep yourself warm, it can lead to abnormal contraction of the vascular tissues in the legs, which can cause leg cramps. This can lead to abnormal contraction of vascular tissues in the legs, which can cause leg cramps. 2. Calcium deficiency: when the patient’s intake of nutrients is too small, resulting in a serious lack of calcium in the body. This causes abnormal fluctuations in neuromuscular excitability in the legs, thus inducing leg cramps. 3. Lumbar intervertebral disc herniation: such as their own due to prolonged strain, induced lumbar intervertebral disc herniation disease, failed to seek timely medical treatment. This leads to the compression of local nerve tissues, nerve conduction dysfunction, resulting in leg cramps. 4. Obstruction of venous return: When the venous return of the lower limbs is obstructed, the blood supply to the legs is abnormal, which can also lead to leg cramps. It is recommended to improve one’s living habits, pay attention to dress warmly, reasonable diet and so on. After eliminating the physiological causes or if the disease worsens, consult a doctor in time for treatment.