Common causes of swollen eyes include granuloma, eyelid dermatitis, conjunctivitis, orbital cellulitis, eye trauma and other ocular diseases, as well as some systemic diseases. 1. Blepharitis: Blepharitis refers to suppurative inflammation of the eyelid glands, and the patient’s eyelids may be red, swollen, painful and other uncomfortable symptoms, and eyelid abscesses may also form. 2. Eyelid dermatitis: Herpes, eczema and other inflammatory diseases of the eyelid skin can cause redness and swelling of the eyelid skin, accompanied by itching and other uncomfortable symptoms. 3. Conjunctivitis: Inflammation of the conjunctiva due to bacterial or viral infection or allergic reaction, patients may have swollen eyes under the stimulation of inflammation, accompanied by conjunctival congestion, foreign body sensation, photophobia, tearing and other uncomfortable symptoms. 4. Orbital cellulitis: Orbital cellulitis is an acute inflammation of orbital soft tissues caused by Staphylococcus aureus and other bacterial infections, and patients may have redness, swelling and severe pain around the eyes and the conjunctiva, even with fever. 5. Ocular trauma: various kinds of ocular trauma can lead to congestion, edema and pain of the soft tissues around the eyes and conjunctiva, and in severe cases, it can also affect the vision. 6. Systemic diseases: heart failure or renal failure and other systemic diseases can also lead to edema of the soft tissues around the eyes. It is recommended that patients with significant eye swelling should consult a doctor in time to assess their condition and follow the doctor’s instructions for treatment.