Head shaking but not feeling it yourself may be caused by idiopathic tremor or Parkinson’s disease. 1. Idiopathic tremor: Symptoms are uncontrollable tremors in the head, hands or voice. It is an autosomal dominant genetic disease, can have a family history, can have an impact on life and work, and is not life-threatening. If necessary, electromyography and genetic testing can be done to clarify the condition. Mild patients can be left untreated, while those with serious conditions can be treated with medication or surgery. 2. Parkinson’s disease: it is a kind of degenerative disease of the nervous system mostly seen in the elderly, the main symptoms include tremor at rest, muscle tonus and so on, and sleep disorder or cognitive impairment may also occur. Imaging examination such as MRI can be improved, and the treatment is mainly based on medication, or surgical treatment can also be taken. If involuntary head shaking occurs occasionally, it can be observed on its own. If the head shaking occurs frequently for unknown reasons, it is necessary to raise vigilance, consult a doctor in time, clarify the condition, and actively treat it.