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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.
Some of the conditions that can cause leg cramps include: 1  Dehydration â when your body loses a lot of fluids, the salt levels get depleted, which can trigger the muscles in the legs to contract. 2  Usually, the reason for dehydration is not drinking enough, but severe diarrhea and vomiting can cause it as well.