Always feel numbness behind the ear to the face, may be related to autonomic dysfunction, may also be trigeminal nerve injury, acute cerebrovascular disease and other causes. 1. Autonomic dysfunction: usually due to long-term irregular work and rest, emotional instability and other causes of neurological dysfunction, autonomic nervous system disorders, there may be a constant feeling of numbness behind the ear to the face, but also with dizziness, panic, chest tightness and other symptoms. 2. Trigeminal nerve injury: may be caused by trauma, infection and other factors, due to damage to the trigeminal nerve, you will always feel numbness behind the ear to the face, may also be accompanied by tingling and other symptoms. 3. Acute cerebrovascular disease: if you suddenly feel numbness behind the ear to the face, accompanied by limb weakness, crooked mouth and other symptoms, you should be alert to the possibility of acute cerebrovascular disease, commonly seen in acute cerebral infarction or cerebral hemorrhage, mainly due to local cerebral vascular ischemia or hemorrhage, resulting in damage to the cerebral nerves, triggering cerebral dysfunction caused by. Always feel numbness behind the ear to the face, may also be caused by other reasons, if accompanied by obvious symptoms of discomfort, should seek medical attention as soon as possible, after diagnosis of the cause, by the doctor’s guidance for treatment.