Eye Redness: Causes, Symptoms & Complications
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What causes eye redness? 35 possible conditions

Eye redness occurs when the vessels in your eye become swollen or irritated. Redness of the eye, also called bloodshot eyes, or pink eye can indicate the presence of several different health problems. While some of these problems are benign, others are... Read more

See a list of possible causes in order from the most common to the least.

1

Conjunctivitis (Pink Eye)

Conjunctivitis, commonly known as "pink eye," is an infection or swelling in the outer membrane of your eyeball. Blood vessels in your conjunctiva, a thin membrane that lines part of your eye, become inflamed. Thi...

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2

Allergies Overview

This condition is considered a medical emergency. Urgent care may be required.

An allergy is the immune system's response to a foreign substance (allergen) that is not typically harmful to a person's body. This attack response may involve inflammation, sneezing, and a host of other symptoms.

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3

Scleritis

Scleritis is inflammation of the outer surface of the eye. How scleritis will affect you often depends on which type you have.

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4

Uveitis

Uveitis is swelling of the middle layer of the eye, which provides blood to the retina. Read about causes, symptoms, and treatment.

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5

External Eyelid Stye (Hordeolum Externum)

An external eyelid stye is an inflamed area or bump on the eyelid. The medical term for a stye is hordeolum externum . Styes are red, painful lumps (most look like pimples) near the edge of the eyelid, where th...

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6

Closed-Angle Glaucoma

Closed-angle glaucoma is an eye condition caused by too much pressure inside your eye. Learn about the types and symptoms of closed-angle glaucoma.

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7

Cluster Headaches

Cluster headaches are severely painful and occur in cycles. Read more for tips on how to treat and relieve them.

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8

Corneal Abrasion

This condition is considered a medical emergency. Urgent care may be required.

A minor scratch to the eye's cornea is called a corneal abrasion. It can be caused by dust, contact lenses, or other foreign objects, and can sometimes develop into a serious eye condition.

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9

Bleeding Under Conjunctiva (Subconjunctival Hemmorhage)

This condition is considered a medical emergency. Urgent care may be required.

The transparent tissue that covers your eye is called the conjunctiva. When blood collects under it, it's known as bleeding under the conjunctiva.

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10

Pterygium

A pterygium is a growth on the conjunctiva or mucous membrane that covers the white part of your eye. These growths usually don't require treatment.

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11

Hyphema

A hyphema is a collection of blood in the eye, between the cornea and the iris. It is painful, and requires immediate medical attention.

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12

Eyelid Turned In (Entropion)

Entropion is when your eyelid rotates inward. Your eyelashes rub against your eye and cause redness, irritation, and abrasions on the cornea of your eye.

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13

Corneal Ulcer

A corneal ulcer is an open sore that forms on the cornea. It's usually caused by an infection. Even small injuries to the eye can lead to infections.

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14

Dry Eye Syndrome

There are a lot of conditions and medications that can cause dry eye syndrome. Read about the causes and treatment options.

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15

Glaucoma

Glaucoma is an eye condition that damages your optic nerve. Learn what causes it.

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16

Reactive Arthritis (Reiter's Syndrome)

Reactive arthritis is a type of arthritis triggered by an infection in the body.

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17

Sarcoidosis

Learn about sarcoidosis and its causes, symptoms, diagnosis, treatment, and potential complications.

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18

Marijuana Dependence

Marijuana is the most commonly used illicit drug in the United States. Uncontrollable or overly frequent marijuana consumption may indicate abuse or addiction.

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19

Toxic Shock Syndrome

This condition is considered a medical emergency. Urgent care may be required.

Toxic shock syndrome is a rare, serious condition caused by a bacterial infection. Rash is one of several common signs for this symptom.

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20

Allergic Conjunctivitis

Allergic conjunctivitis is an eye inflammation caused by an allergic reaction to substances like pollen. Your eyes may become red, itchy, and watery.

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This feature is for informational purposes only and should not be used to diagnose.
Please consult a healthcare professional if you have health concerns.
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