A red eye is a general term used to describe red, irritated, and bloodshot eyes. The redness is caused by the expansion or dilation of blood vessels on the surface of the eye due to irritation or disease. While most cases of eye redness are relatively harmless and usually improve with home remedies or over-the-counter treatments, some cases can be serious if they are a symptom of another disease. Below are some possible causes of eye redness:

• Allergies: Allergies can affect the eyes, leading them to become red and swollen. Other symptoms that you may experience include itching, burning, and increased tearing.

• Dry eyes: If you have dry eyes, you may notice that your eyes appear red. Other symptoms include a stinging, scratchy, or burning sensation, feeling like something is in your eye, sensitivity to light, and blurred vision.

• Conjunctivitis: Conjunctivitis happens when the membrane covering the insides of your eyelids and the white part of your eye, called the conjunctiva, becomes inflamed. This condition is also called pink eye.

• Subconjunctival hemorrhage: If a blood vessel within your eye breaks, it can leak blood onto the surface of your eye, causing it to appear red. While it may look serious, the hemorrhage is often benign and resolves on its own in 1-2 weeks.

• Blepharitis: Blepharitis is an inflammation of your eyelids, causing them or your eyes to appear red and swollen. It may occur if you have high amounts of bacteria on the lids or if the oil glands in the lids become clogged.

If you have red eye that doesnt clear up after several days, or if you have pain or vision problems, make an appointment with an eye care provider, perhaps with an ophthalmologist (eye doctor) or an optometrist.