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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.
Cold weather causing foot cramps may be because the cold causes the arteries in your feet to constrict when you are out in the cold. Warming the feet with a hot, moist towel should help relieve them. This works fast for foot cramps at night too: soak a towel in hot water, wring, and then stand on it.