Causes of facial swelling in the elderly include physiological causes, nephrogenic diseases, allergies, infections and so on. 1. Physiological causes: If the elderly drink a lot of water before going to bed, they will have swelling of eyelids and face when they get up in the morning, and usually recover in a short time. 2. Nephrogenic diseases: when suffering from chronic glomerulonephritis, chronic pyelonephritis and other renal diseases, it manifests itself as the symptom of face swelling. Combined with creatinine, urea nitrogen, renal ultrasound and other examinations to diagnose. 3. Allergy: patients with facial allergy due to various reasons may also have symptoms of swelling. 4. Infection: Swelling of the face can occur when the face of the elderly is infected by bacteria and other infections. The swelling of the face of the elderly is treated after the cause of the disease is clarified, do not use private medication, resulting in damage to the body.