Facial paralysis is one of the common conditions, so what is the diagnosis of facial paralysis? It is introduced as follows 1. In patients with complete paralysis of facial expression muscles, forehead wrinkles disappear, eye fissures widen, nasolabial folds flatten, the corner of the mouth droops, and the corner of the mouth deviates to the healthy side when teeth are exposed. This is one of the diagnostic methods of facial paralysis. 2.Most of the patients tend to find one side of the cheek not moving well and the mouth is crooked when they wash their face and rinse their mouth in the morning. This is also a common diagnosis of facial paralysis. 3.When eating, food residue often stays in the gap between the cheek and the teeth on the sick side, and saliva often drips down from that side. This is one of the diagnostic methods of facial paralysis. 4. The sick side cannot make movements such as frowning, frowning, closing the eyes, puffing and pouting. When puffing out the cheeks and whistling, the affected side of the mouth and lips can not be closed and air leakage. 5.Because the tear point is turned inward with the lower lid, the tear fluid can not be drained according to the normal drainage and overflowed.