If the patient’s calf is like a cramp when he uses force, it may be caused by the following reasons. 1. It may be caused by excessive fatigue. If the patient has done strenuous activities or excessive activities before, it may cause fatigue in the muscles here, and then when the patient wants to exert force again, this symptom will appear, and it is very easy to produce muscle spasms here, that is, cramps. 2. It may be caused by electrolyte disorders. This is because the patient has a lot of vomiting, diarrhea, bleeding or sweating, which may lead to electrolyte disorders in the body, and then produce the above symptoms. 3, may also be caused by the patient’s high excitement, tension. 4, such symptoms are also seen in patients with some neurological diseases, such as the existence of some spinal cord cervical spondylosis, or brain-related lesions.