Muscle jumping can be caused by muscle tension, electrolyte disorders, and lumbar disc herniation. 1. Muscle tension: for example, after fatigue or lifting heavy objects, the hand muscles are too tense, which can lead to hand muscle throbbing. Generally, it can be significantly relieved after rest. 2. Electrolyte disorders: When electrolyte disorders occur in the body, such as reduced sodium ions, can also cause certain parts of the muscle jumping, mostly involuntary muscle jumping. When the temperature changes, the muscles will also be stimulated by the cold air and jump. 3. Lumbar disc herniation: Lumbar disc herniation will cause the pressure in the spinal canal to change, and through the nerve reflection to the lumbar region, causing the lumbar muscles to jump. The herniated disc also compresses the nerve roots, causing abnormal discharges and abnormal muscle throbbing. It is recommended to consult a doctor for further examination to identify the cause of the abnormal muscle throbbing and to carry out targeted treatment or therapy with the help of the doctor.