Swelling of the patient’s lower eyelid may be related to physiological factors, and may also be caused by eye trauma and eye infection. 1. Physiological factors: If patients stay up late for a long time, use their eyes excessively, have poor sleep quality or drink a lot of water before going to bed, etc., it may lead to swelling of the eyelids, but it can be relieved after resting, and does not need special treatment. 2. Ocular trauma: When the patient’s lower eyelid is hit or struck by an external force, it can lead to trauma to the lower eyelid, which can cause swelling of the patient’s lower eyelid, and can also be accompanied by localized bruising of the eyelid, pain and other discomforts. 3. Eye infections: Blepharitis, bacterial conjunctivitis, keratitis and other eye infections can cause swelling of the eye under the stimulation of inflammation, accompanied by tearing, photophobia and other discomforts. It is recommended that patients with significant lower eyelid swelling should seek medical attention to assess their condition and undergo treatment under the guidance of a physician.