Cramps in the calf every morning may have the following two causes: First, because of lumbar disc herniation, the compression of the nerve causes cramps or radiating pain in the calf area, sometimes combined with numbness. The most common clinical condition is a herniated disc in the lumbar fourth or fifth or lumbar fifth sacral one, which compresses the lumbar fifth or sacral one nerve, resulting in twitch-like pain or discharge-like pain in the area innervated by these two nerves, that is, the back of the calf and the outer side of the calf, sometimes manifesting as cramps. The best treatment plan for this condition is to improve the CT or MRI examination of the lumbar spine as soon as possible, and after a clear diagnosis, take appropriate treatment plans for the degree of protrusion. Secondly, it is mostly seen in middle-aged and elderly people, mainly because of osteoporosis and lower blood calcium when they get older, which leads to cramps, and in this case, they should go to the hospital to have their blood calcium tested in time, and if the blood calcium is really low, timely calcium supplementation can be cured.