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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.
Foot cramps are painful and can be caused by several different conditions. A cramp is a sudden involuntary contraction of any muscle, including those in the feet, which can be extremely painful. A muscle cramp, commonly called a charley horse, occurs when the muscle cramps and does not relax, according to MedlinePlus. The muscle can get so tight it feels like a knot underneath the skin.