It is normal to have swelling and pain in the eyes 1 month after cataract surgery if it is relatively mild, but if the pain is strong, it is usually abnormal and may be related to elevated intraocular pressure, postoperative infection and other conditions. 1. Normal phenomenon: If the pain is not strong 1 month after cataract surgery, it may be because the incision is recovering and has not yet healed, which is a normal phenomenon. 2. Elevated intraocular pressure: If there is elevated intraocular pressure after cataract surgery, the eyes may be distended and painful, accompanied by headache, nausea, vomiting and other symptoms. 3. Post-operative infection: If patients do not take proper care after surgery or do not use eye drops according to the doctor’s instructions, it may cause infection around the wound, resulting in eye swelling and pain. It is recommended that if the patient’s symptoms continue to be unrelieved or accompanied by other discomforts, he/she should go to the hospital in a timely manner to clarify the cause of the disease and follow the doctor’s instructions for treatment.