Bloodshot and swollen eyes may be caused by keratitis, scleritis, uveitis and so on. 1. Keratitis: mostly due to the weakening of the cornea’s defense ability, external or endogenous pathogenic factors invade the corneal tissue, resulting in hemorrhage and swelling of the eyes, accompanied by vision loss. 2. Scleritis: mainly caused by endogenous antigen-antibody-immune complex, related to autoimmunity, resulting in congestion and swelling of the patient’s eyes, with eye pain, vision loss and other symptoms. 3. Uveitis: if affected by infection, injury, autoimmunity and other diseases, patients will have bloodshot and swollen eyes, accompanied by blurred vision and dark shadows in front of the eyes. Bloodshot and swollen eyes, it is recommended to go to the hospital in a timely manner, under the guidance of the doctor to carry out relevant examinations, follow the doctor’s instructions to take targeted treatment.