Numbness of the left eyebrow may be caused by physiological factors, but also may be caused by poor blood circulation, nerve paralysis, nerve inflammation. 1. Physiological factors: If you are tired recently and do not get enough rest, you may have a numbness of the left eyebrow, generally a physiological phenomenon, do not need special treatment, timely rest can be improved. 2. Pathological factors (1) Poor blood circulation: numbness of the left eyebrow may also be caused by prolonged localized pressure or poor blood circulation caused by violence, which can be alleviated by acupuncture, massage, etc. by a professional doctor to promote blood circulation. (2) Nerve paralysis: Nerve paralysis may be caused by various diseases, such as facial neuritis, cerebrovascular disease, spinal cord tumors and aneurysm compression, etc., the patient will have the feeling of muscle throbbing. (3) Nerve inflammation: for example, common peripheral neuritis, patients will have abnormal sensations, such as pain, numbness, muscle weakness and so on. In addition to the above factors, it cannot be ruled out that the numbness of the left eyebrow is caused by other reasons, and it is recommended to consult a doctor for standardized treatment in time when the symptoms persist.