The redness of the inner corner of the patient’s eye may be caused by intraocular foreign body, acute conjunctivitis, keratitis and other factors. 1. Intraocular foreign body: if the patient’s eye accidentally enters the sand, small flying insects and other foreign objects, it may cause friction on the surface of the eye, conjunctiva, cornea and so on, which may lead to the performance of the patient’s eye redness in the inner corner of the eye. 2. Acute conjunctivitis: If the patient’s conjunctiva is infected by bacteria, viruses and other pathogens, an acute inflammatory reaction may occur, resulting in eye congestion, redness of the corners of the eyes, tearing, itching and other symptoms. 3. Keratitis: Keratitis patients because of inflammation stimulation, may appear eye stinging, photophobia, eyelid spasm, ciliary congestion and other uncomfortable symptoms, but also may be accompanied by varying degrees of vision loss. It is recommended that patients with significant redness in the inner corners of the eyes should seek prompt medical attention to assess their condition and follow the doctor’s instructions for treatment.