Sudden toe cramps are usually caused by overwork, local blood circulation obstruction, calcium deficiency, cold stimulation and other factors. 1. Overwork: After overwork, the muscles will be overloaded, resulting in damage and dysfunction, which will lead to sudden toe cramps; in addition, overwork can cause lactic acid to accumulate in the body, which can also cause sudden toe cramps. 2. Obstruction of local blood circulation: If you suffer from varicose veins or arterial embolism in the lower limbs, it can affect the blood circulation of the feet, which can cause sudden cramps in the toes. 3. Calcium deficiency: Calcium ions can stabilize the nerve cell membranes. A lack of calcium in the body will increase neuromuscular excitability, thus causing sudden toe cramps. 4. Cold stimulation: If the feet do not pay attention to keep warm, also due to cold stimulation of blood vessel contraction, resulting in sudden cramps in the toes. In addition, there are many other causes of sudden toe cramps including diabetic complications and epilepsy, etc. If not accompanied by other discomforts, the symptoms can be relieved through massage and foot soaking in warm water. If accompanied by other symptoms, you should go to the hospital in time for consultation.