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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.
There are a number of known causes of leg/foot cramps at night. Some of these causes include foot problems (such as flat feet), low potassium or low calcium levels, dehydration, hypothyroidism (underactive thyroid) or are associated with underlying neuropathy. However, most people who develop leg cramps at night have no obvious reason.