Old body spasms may be caused by low calcium, epilepsy and muscle fatigue. 1. Low calcium: long-term poor diet, excessive partiality, picky eating, resulting in lack of nutrients in the body, especially when calcium deficiency, resulting in low blood calcium levels, which can easily cause muscle spasms. 2. Epilepsy: due to abnormal neuron discharge in the brain, which leads to spasmodic convulsions of the limbs, which can be accompanied by foaming at the mouth, loss of consciousness, rolling of the eyes, urinary and fecal incontinence and other symptoms. 3. Muscle fatigue: Unreasonable exertion, movement difficulty beyond the body’s ability, trying new and unaccustomed movements can lead to muscle fatigue, resulting in a decrease in coordination of movements and triggering muscle spasms. The body always appear spasm, may also be other causes, need to actively consult the doctor, clear the cause of the targeted treatment.