What causes leg cramps at night?

Common causes of leg cramps at night include: 1. Intense physical activity: After strenuous exercise during the day, lactic acid in the leg muscles may not be metabolized in time, which can irritate the local muscles during sleep and trigger cramps. In such cases, local massage can help relieve symptoms. 2. Cold exposure: If the lower leg is exposed to cold for prolonged periods during sleep, it may lead to muscle spasms. Keeping the legs warm, for example by applying heat packs, can help alleviate this. 3. Calcium deficiency: Calcium is essential for maintaining normal nerve and muscle function. Low calcium levels may reduce the excitation threshold at neuromuscular junctions, causing abnormal muscle contractions even with minor stimulation. Increasing intake of calcium-rich foods such as dairy products, legumes, and fish can help prevent cramps. 4. Underlying medical conditions: Certain diseases, such as lumbar disc herniation or thyroid disorders, may also cause leg cramps. In these cases, treatment should focus on managing the specific underlying condition.