Swollen eyelids can be caused by physiological factors such as mosquito bites and sleeping conditions, as well as pathological factors such as eye allergies, eye infections and kidney failure. 1. Physiological factors: if too much water intake before going to bed, poor sleep quality may lead to eyelid swelling. In addition, mosquito bites can also lead to eyelid swelling. 2. Eye allergies: if the eyes accidentally come into contact with allergens, triggering the body’s immune mechanism, there may also be eyelid swelling. 3. Eye infections: when the eyes are infected with bacteria, viruses and other pathogens, such as Staphylococcus aureus infection, patients may show symptoms such as eyelid congestion, redness and swelling. 4. Kidney failure: patients suffering from kidney failure disease, because of water and sodium retention, may lead to generalized edema, resulting in eyelid swelling. Eyelids are swollen with various factors, exclude physiological factors should go to the hospital in time for treatment.