Numbness of the left ear is divided into physiological and pathologic, and the causes of pathology include ear diseases, orthopedic diseases and neurological diseases. 1. Physiological: If the left ear is pressed for a long time due to incorrect sleeping posture, it will produce the feeling of numbness in the left ear, which is a normal physiological phenomenon, and no additional special treatment is needed, and most of them can be relieved on their own. 2. Pathological: Suffering from ear diseases is one of the causes of numbness in the left ear, such as otitis cartilaginous, otitis externa, otitis media and other diseases; there are also cervical vertebrae related diseases, which can compress the local nerves and lead to numbness in the left ear; herpes zoster infection in the ear is also a common cause of numbness in the ear. If you have symptoms of numbness in the ear, it is recommended to go to the hospital for examination to clarify the cause of targeted treatment.