Sudden eye swelling is related to non-disease factors such as staying up late and crying, or it may be caused by pathological factors such as eyelid inflammation, conjunctivitis, and systemic diseases. 1. Non-disease factors: staying up late, excessive eye use, drinking too much water before going to bed, crying and other factors can lead to the manifestation of sudden eye swelling. 2. Disease factors: Inflammation of the eyelids, such as blepharitis, patients may experience eyelid swelling. Conjunctivitis, orbital cellulitis, dacryoadenitis and other diseases, can also appear eyelid swelling symptoms. Patients with glomerulonephritis, nephrotic syndrome, and cardiac insufficiency can also experience eyelid swelling. There are many causes of eye swelling, and if it cannot be relieved by rest for a long time or is accompanied by other discomforts of the body, it is recommended to go to the hospital in time for consultation and treatment.