Red, swollen and watery eyes may be caused by blepharitis, dacryocystitis, tear duct obstruction and so on. 1. Blepharitis: usually caused by staphylococcal infection, the bacteria will enter the root of eyelashes through the opening, and patients will have red, swollen and watery eyes, accompanied by painful symptoms. 2. Dacryocystitis: when the patient’s nose is abnormal or damaged, it will lead to long-term retention of tears in the lacrimal sac, triggering bacterial growth, when the invasive bacteria are more virulent, or the patient’s body resistance is low, it will cause redness and swelling of the eyes and tears. 3. Tear duct obstruction: when affected by inflammation, trauma, foreign bodies, tumors and other factors, there will be red, swollen and tearful eyes, and part of the eye pus phenomenon. It is recommended that patients go to a regular hospital, follow the doctor’s instructions to actively standardize the treatment, pay attention to eye hygiene in life, avoid eye fatigue.