The severity of facial muscle synkinesis, contracture, spasm, crocodile tears and hearing impairment and/or tinnitus were observed carefully following facial nerve palsy and evaluated quantitatively by a scoring system. Using this system, a mathematical formula was obtained to predict sequelae from the severity of facial nerve palsy. The severity of palsy at 2 weeks and 2 months after its onset was an important sign for prediction of sequelae.