*Updated April 2026
Key takeaways about red eyes:
- Almost everyone will get red eyes at some point, which means understanding the causes and knowing the right treatments is crucial.
- In many cases, the reasons behind your red eyes aren't a big concern. They can resolve without extra help. Common reasons include allergies, conjunctivitis, dry eye, and broken blood vessels.
- In certain situations, the reasons behind red eyes are serious and need medical intervention. These include acute angle-closure glaucoma, uveitis, and corneal ulcer.
Have you ever caught a glimpse of yourself and noticed that your eyes look a bit red?
Red eyes can stem from a wide range of conditions, from minor irritants to more serious concerns. And since nearly everyone experiences them at some point, knowing what's behind the redness and how to respond really matters.
The right knowledge can help you decide whether to wait it out at home or seek care from an eye doctor before things get worse.
Common and manageable causes of red eyes
In many cases, the reasons behind your red eyes aren't a big concern. They can resolve without extra help.
Common reasons include:
Allergies
If your eyes suddenly turn itchy, watery, and red, an allergic reaction could be to blame. This happens when your immune system overreacts to a foreign substance, triggering inflammation and irritation in the process.
- Causes: Exposure to pollen, pets, mold, dust, and other substances.
- Treatment: Over-the-counter oral antihistamines, doctor-prescribed antihistamines, or decongestant eye drops.
Conjunctivitis
Conjunctivitis, more commonly known as pink eye, is a common and contagious infection. Symptoms can vary, but you can typically spot it by the discharge from the eyes and their pinkish or red color.
- Causes: Viral or bacterial infections.
- Treatment: Remove makeup and contacts immediately. If the condition doesn't go away on its own, a doctor may prescribe antibiotic eye drops or ointments depending on the cause.
Note: Conjunctivitis caused by a virus cannot be treated with antibiotics. Be sure to speak with a doctor for additional information and treatment options.
Dry eye
If your eyes aren't producing enough tears, you may experience dry eyes. This condition is often associated with a scratchy or burning sensation, sensitivity to light, blurred vision, and red eyes.
- Causes: Age, illness, blinking less often, dry environments, medications, and contacts.
- Treatment: Lubricating eye drops, staying hydrated, avoiding triggers, giving your eyes a break (especially while using a screen), and others.
Broken blood vessels
If you look in the mirror and notice a strikingly red patch in your eye, you may have broken a small blood vessel. Known as a subconjunctival hemorrhage, this happens when one of the tiny blood vessels beneath the eye's surface bursts, causing blood to pool and spread across the white of the eye.
- Causes: Eye rubbing, intense coughing or sneezing, a direct injury to the eye, blood-thinning medications, and more.
- Treatment: Broken blood vessels look more alarming than they are. They often go away on their own. If you have recurrent subconjunctival hemorrhages or pain, be sure to speak to your doctor.
Serious and urgent causes of red eyes
In certain situations, the reasons behind red eyes are serious and require medical intervention. Some of these need to be treated as emergencies, so it’s very important to seek help immediately.
Acute angle-closure glaucoma
This condition occurs when the eye's fluid pathways become blocked, preventing proper drainage and causing pressure to build within the eye. The result can be a sudden onset of red eyes, severe headache, eye pain, and nausea or vomiting. These are all warning signs of a serious medical emergency that requires immediate attention.
- Causes: Acute angle-closure glaucoma can be caused by the thickening of the natural lens and aging. However, it may also be triggered by dilating eye drops and certain medications.
- Treatment: Seek medical attention immediately. A doctor may prescribe eye drops or oral medication. In severe cases, your doctor may perform an iridotomy operation, which helps relieve pressure in the eye by placing a tiny hole in the iris.
Uveitis
Uveitis occurs when the middle layer of the eye becomes inflamed, causing the eye to appear red.
- Causes: Autoimmune disorders, infection, or cancer.
- Treatment: Steroids and anti-inflammatory medications in the form of pills, eye drops, injections, or implants.
Corneal ulcer
A corneal ulcer is a type of eye injury identifiable by an open sore on the cornea, a symptom of which can be red eyes.
- Causes: Trauma, infection from bacteria, viruses, fungi, or improper contact lens use, or autoimmune diseases.
- Treatment: Seek medical attention immediately. A doctor may prescribe an antibiotic or antifungal treatment to help prevent vision loss or corticosteroids.
Understanding the causes of red eyes can protect your eye health
Recognizing the underlying causes of red eyes is essential for protecting your long-term eye health. While red eyes are often harmless and resolve on their own, they can sometimes signal something more serious.
Staying informed means you'll know when to treat symptoms at home and when it's time to seek professional care, ensuring that minor eye irritations never have the chance to become major complications.
Looking for ways to protect your eye health? Check out “The Sun and Our Vision | Prevent Eye Damage from the Sun”.
