The cause of redness and congestion of the eyeball is the expansion of blood vessels on the surface of the eye congestion, common causes can be caused by eye fatigue, foreign bodies, trauma and other external stimuli, as well as eye diseases including conjunctivitis, lacrimal sacculitis, glaucoma and other causes, the following are common: 1. External stimuli: 1. Eye fatigue: patients do not get enough sleep or play cell phones for a long time to watch computers, etc., resulting in overuse of the eye, which in turn appears Eye redness, congestion; suggest that patients pay attention to rest, but also eye exercises or hot towels or steam eye mask for hot compresses to relieve symptoms; 2, intraocular foreign body: is due to sand, flying insects and other foreign objects into the eye, causing friction in the eye so that the eye redness, congestion, pain and other conditions, suggest that patients use saline or water for flushing, can remove the foreign body in the eye; 3, eye trauma: is Due to eye contusion, chemical injury, electric light irritation injury, etc. resulting in redness, congestion, pain, etc., it is recommended that the eye trauma should be promptly sought after, so as not to cause serious consequences. Second, eye diseases: 1, conjunctivitis: due to bacteria, viruses, allergies and other stimuli triggered by inflammation of blood vessels in the conjunctiva, manifested as redness, congestion, swelling, etc., it is recommended that patients use lubricating eye drops and antibiotics and other drugs, allergies to avoid contact with allergens, in order to help relieve eye symptoms; 2, dacryocystitis: is caused by various reasons leading to narrowing or obstruction of the nasolacrimal duct, tear retention in the tear sac, inducing bacterial Infection, and the eye redness, congestion, pain, photophobia, tearing and other symptoms, can be treated with antibacterial drugs, such as levofloxacin, tobramycin, etc., can remove the infection and relieve symptoms; 3, glaucoma: due to pathologically high intraocular pressure caused by optic nerve atrophy, manifested as redness, congestion, photophobia, tearing, blurred eyes, vision loss, etc., can be used under the guidance of doctors mannitol, brinzolamide, etc. 4. Other: High myopia or other fundus lesions can also cause redness and congestion in the eyes, such as keratitis, sclerositis, iritis, etc., which require medical consultation to clarify the cause and treat the cause. Third, other lesions: patients with previous systemic diseases such as diabetes, hypertension, kidney disease may cause eye congestion and redness, or may be caused by cranial occupational lesions. However, most patients also have other discomforts, such as edema, elevated blood pressure, elevated blood sugar, headache, nausea, etc. This condition requires prompt hospital consultation to identify the cause and provide targeted treatment.