There is a million different things. Where exactly is the pain? Here's some common causes: * Stress or fatigue in the foot – An overworked foot is often susceptible to foot cramps. * Poor circulation – Foot cramp is caused by lack of oxygen being carried to the foot. * Lack of potassium – This important mineral, found in salt, helps regulate body chemistry and keep you foot cramp free. * Dehydration – Lack of water in the muscles contribute to foot cramps. * Changing hormone levels – Foot cramps may occur while muscle tissue adjusts to these changes. * Pinched nerves – Caused when the electrical impulse from the brain cannot reach the muscle, this can cause foot cramps, numbness and other symptoms. * Nutritional deficiency – A healthy diet, complete with all essential nutrients can keep muscles and nerves functioning normally. * Environmental toxicity – Certain “poisons” we encounter (via factories, contaminated water, etc.) may play a role in increased foot cramps. * Chemical sensitivity – Some prescriptions may change the conditions in the body and make foot cramps more likely.
Could be several things: improper stretching, I'll fitting shoes, pushing the limits too far, magnesium levels too low. I use quinine pills under my tongue to relieve the onset of leg and foot cramps! If I up my magnesium intake they are less frequent!