There are many causes of eye congestion. Conjunctival congestion can be caused if the surface of the eye is irritated by microbial infections, chemical substances, foreign bodies, etc., or if there is mechanical obstruction of blood flow, such as acute angle-closure glaucoma, conjunctivitis, iridocyclitis, uveitis, protrusion of the eye, intraorbital tumors, etc. If the congestion is near the fornix of the eye, it is called conjunctival congestion and is generally considered to be caused by various types of conjunctivitis; if the congestion is near the edge of the cornea, it is called ciliary congestion and may be caused by inflammation of the cornea and deeper tissues of the eye; if the entire eye is congested, it is mixed congestion and may be associated with uveitis, glaucoma, or deeper inflammation of the eye; if the congestion is only in one part of the bulbar conjunctiva, it may be vesicular conjunctivitis or orbital tumors. It may be caused by vesicular conjunctivitis or sclerositis, or foreign body irritation, etc. In addition, chronic conjunctivitis may occur in patients who have been in a smoky, hot, humid, or polluted environment for a long time, or in patients who are addicted to alcohol and tobacco; or in patients who have been working at close range for a long time and suffer from visual fatigue, refractive error, or dry eyes. Therefore, if you find that your eyes are congested, it is recommended that you seek medical attention and treatment in a timely manner.