If the patient suddenly swollen face is the following factors: 1, infectious factors, the face is often easy to be bacteria, viruses, fungi or atypical pathogens, such as mycoplasma and chlamydia and invasion, so there will be infected, in the infection of the face will suddenly swollen. 2, the face of the subcutaneous cellulitis, can also lead to the face suddenly swollen. 3, swollen lymph nodes of the lower jaw, Facial lymphadenitis, which can also lead to swelling of the face.4. Infections of the facial nerve, such as facial neuritis or trigeminal neuralgia, which can also lead to swelling and edema of the face.5. Oral surgical diseases, such as mumps and gingivitis, which can also lead to swelling of the face.