Pain in the right eye should be alert to conditions such as granuloma, conjunctivitis, glaucoma, eye fatigue, and also due to allergic reactions. 1. Blepharitis: Also known as blepharitis, mostly caused by purulent bacterial infections, clinical manifestations of redness, swelling, heat, pain in the eye, and yellow purulent discharge. 2. Conjunctivitis: The clinical symptoms of conjunctivitis include foreign body sensation in the affected eye, burning sensation, heaviness of the eyelids, and increased secretion. Although conjunctivitis itself does not have a serious effect on vision, when its inflammation spreads to the cornea or causes complications, it can lead to visual impairment. 3. Glaucoma: Clinical symptoms of glaucoma include eye swelling, eye pain, photophobia, tearing, headache and sharp decrease in vision. If the intraocular pressure of glaucoma is not properly controlled or treated in time, irreversible visual function damage may occur, and in severe cases, blindness may result. It may cause vasoneurotic headache, hypertension, cardiovascular and cerebrovascular lesions and other diseases. 4. Visual fatigue: Visual fatigue can cause eye muscle spasm, which can also lead to eye pain and vision loss. 5. Allergic diseases: Such as allergic conjunctivitis, there can be conjunctival congestion and edema after contact with allergens, burning pain in the eyes, accompanied by mucous secretions. Different anti-allergic drugs or hormone therapy can be taken according to different clinical manifestations in the treatment. In addition to these, the right eye pain may also have other causes, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.