Common symptoms: The typical symptoms of facial paralysis are sudden paralysis of facial expression muscles on one side, disappearance of frontal lines on the affected side, inability to close eye fissure, shallow nasolabial groove, drooping mouth, bulging cheeks, air leakage when whistling, food easily staying between the teeth and cheeks on the affected side, accompanied by loss of taste in the first two thirds of the tongue on the affected side, auditory allergy, tears, etc. In addition, there are four common complications after facial paralysis: hemifacial spasm, hemifacial joint movement, crocodile tears syndrome and hemifacial fiber spasm.