Leg cramps can be caused by a lack of vitamin D. However, a lack of calcium ions and a cold cannot be ruled out as causes of leg cramps. The main function of vitamin D is to promote the absorption of calcium. If your body is deficient in vitamin D, you are especially prone to leg cramps. So when leg cramps occur, vitamin D can be supplemented appropriately. Leg cramps can also be caused by calcium ion deficiency. If leg cramps are severe you can go to your local hospital for a calcium ion test to see if you have a calcium deficiency. If there is a calcium deficiency, you can take calcium supplements by way of oral medication. For example, take calcium gluconate tablets, calcium carbonate tablets and other medications. In addition, leg cramps can also be caused by cold. In this case, you should add more clothes to avoid the legs getting cold. If leg cramps continue to worsen, you can use medication to relieve them under the guidance of your doctor, such as ibuprofen or meloxicam. When leg cramps occur, you can take vitamin D and calcium supplements, and you should also add more clothes to avoid catching cold. Eat more calcium-containing foods in your diet to replenish the calcium ions in your body. You can exercise properly in your daily life to increase the content of calcium ions in your muscles. The use of drugs need to follow the doctor’s instructions, leg cramps can not be relieved, then you need to consult a doctor in time to check, clear the cause of timely treatment.