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Medical conditions such as diabetes can cause foot cramps due to the lack of oxygen supplied to the feet. It is very important that you eat properly and get enough vitamins and minerals. A lack of potassium in your system can cause cramps in your feet and legs. Vitamin D is also important to healthy feet and bones.
Leg cramps. Leg cramps or spasms are a painful tightening of the muscles in the leg. Staying in bed for long periods of time sometimes can cause leg or foot cramps. Dehydration, certain drugs, overuse, and brain or nerve diseases can also cause cramps. Massage the leg, if itâs OK with your cancer team. 2  When you have a cramp, contract the opposite muscle group. 3  Sit up or stand up to stretch the tight muscle as much as you can without hurting it. 4  For example, for a calf muscle cramp, try pointing the toes upward toward the knees, or walk around.