Swelling below the corner of the eye may be caused by physiological reasons, but we can’t rule out pathological reasons, such as eye allergies, blepharitis and so on. 1. Physiological causes: Due to poor rest, body fluids are concentrated in the eyes when sleeping, and patients may have swollen eyes after getting up. This kind of swelling is usually mild, and usually can gradually subside after a period of time. Patients need to pay attention to rest and develop a good lifestyle. 2. Allergic reaction: If allergic patients are allergic to food, pollen and other allergens, patients may experience swelling below the corners of the eyes, which may also be accompanied by rashes, itching and other symptoms. 3. Blepharitis: Blepharitis refers to suppurative inflammation of the eyelid glands, and under the stimulation of inflammation, the patient’s eyelids may appear red, swollen, painful and other uncomfortable symptoms. It is recommended that patients with significant swelling at the corners of the eyes should consult a doctor to evaluate their condition and follow the doctor’s instructions for treatment.