Old cramps may be caused by cold stimulation, epilepsy, calcium deficiency, muscle fatigue and so on. 1. Cold stimulation: it may be caused by cold stimulation, such as low room temperature at night in winter, too thin quilt during sleep or exposed legs and feet to the outside causing the phenomenon of old cramps. 2. Epilepsy: uncontrolled partial seizures can lead to recurrent convulsions. 3. Calcium deficiency: old cramps can also be caused by calcium deficiency, the decline of calcium levels in the blood, which can lead to localized muscle spasms, and then the phenomenon of old cramps. 4. Muscle fatigue: Unreasonable exertion, movements that are more difficult than the body’s ability, and attempting new and unaccustomed movements can lead to muscle fatigue, resulting in a decrease in coordination of movements and triggering muscle spasms. Patients often appear old cramps, it is recommended to actively go to the hospital for relevant examinations, to clarify the cause of the disease to make the appropriate treatment.