Involuntary head shaking is mostly considered to be caused by idiopathic tremor, Parkinson’s disease, epilepsy and other diseases. 1. Idiopathic tremor: the cause of this disease is still unclear, but modern research has found that it is related to genetic and environmental factors. It mainly manifests as postural tremor, which usually starts in the upper limbs and then affects the head, neck, trunk and other places, followed by involuntary head shaking. 2. Parkinson’s Disease: This disease may be related to heredity, aging of the nervous system, environment and other reasons. Common symptoms include neck stiffness, resting tremor, sensory disturbances, etc. With the development of the disease, the lower limbs, mouth and lips, head and other places will be involved, which can be manifested as involuntary head shaking. 3. Epilepsy: The disease may be caused by traumatic brain injury, cerebrovascular disease, abnormal brain development, poisoning, cerebral vascular malformation, etc. Common risk factors include heredity, age, sleep, and internal environmental changes. Because some patients have atonic seizures, there will be symptoms of sudden relaxation of head muscles and involuntary shaking, accompanied by twitching and dilated pupils. There are many reasons for involuntary head shaking, and it is necessary to go to the hospital and do relevant examinations to clarify the specific causes.