HiCustomer Thanks for the question,
This usually comes from intrinsic muscles if foot. It may occur if these muscles aren't getting enough oxygen (poor blood supply), Mineral deficit (Magnesium, calcium, Potassium), or other metabolic problems.
Do you have any chronic illnesses? on any medications, especially diuretics? Is this a new development or longterm? Is only the foot effected?
If I've answered your question to your satisfaction, please click on accept, If not please get back to me with more answers or questions.In the meantime, use a towel or elastic bandage to to dorsiflex (bring up to ward your head, thus stretching the muscles that are cramping. Dr. L