Crying face numbness may be caused by respiratory alkalosis, insufficient blood supply to the brain, high blood pressure and other reasons 1. Respiratory alkalosis: due to the short inhalation time and long exhalation time when crying loudly, excessive ventilation occurs, and a large amount of carbon dioxide will be exhaled out of the body, and the body’s acidity is not enough, respiratory alkalosis may occur, which may also lead to numbness of the face when crying. 2. Insufficient cerebral blood supply: If there is insufficient cerebral blood supply, crying can temporarily aggravate the insufficient cerebral blood supply, or even induce acute cerebrovascular disease, brain tissue in the case of ischemia and hypoxia, will produce symptoms of numbness in the face. 3. Hypertension: If the patient himself suffers from hypertension, crying will lead to increased blood pressure, which will also cause symptoms of numbness of the face. If there is the case of crying face numbness, you should go to the hospital in time for relevant examinations, to clarify the specific causes, to take the appropriate treatment program.