Sudden fundus hemorrhage in one eye, also known as sudden bleeding on one side of the fundus, may be due to external stimulation, eye diseases, systemic diseases and other factors, the specific analysis is as follows: 1, external stimulation: 1, eye trauma: due to eye contusion, chemical drug stimulation, electro-optical stimulation, etc., resulting in eye damage, and then the injured side of the eye pain, fundus hemorrhage, etc., it is recommended that after eye trauma should 2, head stimulation: the patient’s head stimulated by sticks, rods and other objects, or fall head impact, causing brain damage, and then the performance of the fundus hemorrhage, it is recommended that patients avoid external stimulation, the symptoms are serious to go to the hospital for treatment. Eye diseases: 1, conjunctivitis: due to bacteria, viruses, allergies and other stimuli triggered by inflammation of blood vessels in the conjunctiva, capillary congestion resulting in red eyes, for some patients with severe congestion, may lead to bleeding on one side of the fundus, it is recommended that patients promptly anti-infection treatment, commonly used drugs such as ofloxacin, tobramycin, etc.; 2, retinal vasculitis: the disease is caused by infection, systemic diseases, eye inflammation The treatment principle is symptomatic treatment, if the bleeding is caused by infection, timely anti-infection treatment, commonly used drugs are penicillin, gentamicin, oxyfluoroxacin, etc.; 3, optic neuritis: mostly caused by infection, inflammatory demyelination, autoimmune diseases and other causes leading to impaired optic nerve function, and then visual acuity Decline, unilateral or bilateral eye discomfort, can use prednisone, methylprednisolone and other drugs to suppress inflammation and regulate immunity. Systemic diseases: 1. Diabetes mellitus: In patients with diabetes mellitus, changes in cellular metabolism and abnormal insulin secretion may cause changes in ocular nerve, ocular tissue and vascular microcirculation, resulting in damage to the retinal vascular barrier, which in turn causes leakage from the tiny blood vessels in the eye, causing unilateral fundus hemorrhage. Patients are recommended to actively treat diabetes mellitus, which can be treated with insulin and biguanides to relieve the symptoms of fundus hemorrhage; 2, hypertension: elevated blood pressure will stimulate the retinal arterial blood vessel wall tension, resulting in hypertensive fundus lesions and fundus hemorrhage, patients are recommended to take antihypertensive drugs as prescribed by the doctor to control blood pressure to help relieve symptoms; 3, blood disorders: blood system diseases caused by Fundus hemorrhage, clinical symptoms are similar to hypertensive retinopathy, mainly manifested as scattered small dots and plaque type hemorrhage visible in the fundus. Common hematologic disorders mainly include anemia and coagulation abnormalities, which are manifested as hereditary coagulation factor deficiency, Warfarin poisoning, congenital bleeding quality disorders, etc. Patients are advised to actively treat the primary disease to help relieve the symptoms of fundus hemorrhage.