Finger cramps may be the harbinger of calcium deficiency, epilepsy, cervical spondylosis and carpal tunnel syndrome. 1. Calcium deficiency: when the intake of vitamin D or calcium is insufficient, it can cause increased nerve and muscle excitability, finger cramps, flexion of metacarpophalangeal joints, thumb close to the palm, and in some cases, combined with toe cramps, which can be alleviated by calcium and vitamin D supplementation. 2. Epilepsy: simple partial seizure epilepsy can be manifested as finger cramps, conscious during the seizure, the cramping time is usually less than 1 minute, and the electroencephalogram is abnormal during the seizure. 3. Cervical spondylosis: when the herniated disc compresses the cervical spinal cord and nerves, and there are sensory and motor disorders in the fingers, finger cramps can appear, and some of them will have numbness, which can be clearly diagnosed by doing cervical spine MRI films. 4. Carpal Tunnel Syndrome: Carpal Tunnel Syndrome is caused by the compression and stimulation of the median nerve due to the hyperplasia of the transverse carpal ligament, which can cause the excitability of the median nerve to increase, and finger cramps innervated by the median nerve can occur. The diagnosis is usually made through physical examination by a doctor and electromyography. When finger cramps occur frequently, you need to go to the hospital for examination.