Most cases of red eye clear up on their own or with simple home care. The right treatment depends on what’s causing the redness: an infection, allergies, dryness, a broken blood vessel, or something more serious. Here’s how to figure out what you’re dealing with and what to do about it.
Start With the Likely Cause
Conjunctivitis (pink eye) is the most common cause of red eye. But the list also includes dry eyes, blepharitis (inflamed eyelids), a scratched cornea, a broken blood vessel, allergies, and less common but serious conditions like keratitis or glaucoma. Each has a different treatment, so matching your symptoms to the right cause matters more than reaching for whatever eye drops are in your medicine cabinet.
A few quick clues can help you narrow it down. Itching points toward allergies. Thick, crusty discharge suggests a bacterial infection. Watery eyes with a burning sensation are typical of viral pink eye or dry eye. A bright red patch with no pain or discharge is almost certainly a broken blood vessel. And significant pain, light sensitivity, or vision changes are signs of something that needs professional attention right away.
Viral Pink Eye
Viral conjunctivitis is the most common type of pink eye, and antibiotics do nothing for it. It typically clears up in 7 to 14 days without treatment, though some cases can linger for two to three weeks. In the meantime, cold compresses, artificial tears, and over-the-counter decongestant eye drops can take the edge off the discomfort. Keep your hands clean and avoid sharing towels or pillows, since viral pink eye spreads easily.
More serious viral infections, like those caused by herpes simplex, are a different story. If you have a history of cold sores or notice blisters near your eye, a doctor can prescribe antiviral medication.
Bacterial Pink Eye
Bacterial conjunctivitis usually produces thicker, yellowish or greenish discharge that can glue your eyelids shut overnight. Antibiotic eye drops are the standard treatment, and no single antibiotic has proven superior to another, so cost and availability typically guide the choice.
That said, mild bacterial pink eye often resolves on its own even without antibiotics. Delaying treatment and watching for improvement over a day or two is a reasonable approach for many people. If the discharge gets heavier, the redness spreads, or you develop pain, that’s the signal to start antibiotic drops.
Allergic Conjunctivitis
If your eyes turn red and itchy every spring or whenever you’re around cats, allergies are the likely culprit. The first steps are straightforward: avoid the trigger when possible, and use preservative-free artificial tears to flush allergens off the surface of your eye. Cold compresses also help reduce swelling and itching.
For mild symptoms, over-the-counter antihistamine/decongestant combination drops provide quick relief. For persistent seasonal or year-round allergies, newer antihistamine eye drops work better and need to be applied only twice a day. Mast cell stabilizer drops are another option, though some formulations require dosing four times daily, which makes them less convenient. Many newer over-the-counter allergy drops combine both antihistamine and mast cell stabilizing effects in a single product, giving you both immediate and longer-term relief.
Dry Eyes
Chronic dryness causes a low-grade redness that tends to get worse later in the day, especially after screen time. Artificial tears are the mainstay treatment. If you’re reaching for them more than four times a day, switch to preservative-free drops. The preservatives in regular artificial tears can irritate your eyes with frequent use.
At night, a thicker lubricant ointment slows tear evaporation while you sleep. Practical changes help too: a humidifier in your bedroom, taking breaks from screens every 20 minutes, and wearing wrap-around glasses or sunglasses outdoors to block wind. These steps won’t cure dry eye, but they reduce the redness and gritty discomfort significantly.
Blepharitis
Blepharitis is inflammation along the eyelid margins. It causes redness, flaking, and a gritty or burning sensation. Treatment centers on daily eyelid hygiene: soak a clean washcloth in warm water, hold it over your closed eyes for several minutes, then gently scrub along the lash line with diluted baby shampoo or a pre-made eyelid scrub solution. Follow with a gentle lid massage to help unclog the oil glands.
This isn’t a one-and-done fix. Blepharitis is a chronic condition, and the cleaning routine needs to continue indefinitely to keep symptoms under control. If eyelid hygiene alone doesn’t bring relief, a doctor may recommend an antibiotic ointment applied directly to the eyelid margins.
Broken Blood Vessel
A subconjunctival hemorrhage looks alarming: a bright red patch spreading across the white of your eye. But it’s harmless. A tiny blood vessel broke under the surface, and the blood has nowhere to go, so it pools visibly. This can happen from sneezing, coughing, straining, or sometimes for no obvious reason at all.
No treatment is needed. The blood reabsorbs on its own, usually within two weeks. Warm compresses and lubricating drops can make the eye feel more comfortable in the meantime. The red patch may shift colors, turning yellow or green like a bruise, before it fully fades.
Warm Compress vs. Cold Compress
Both warm and cold compresses help with red eyes, but for different reasons. A cold compress constricts blood vessels and reduces itching, making it ideal for allergic reactions and viral pink eye. A warm compress loosens clogged oils in the eyelid glands, so it’s the better choice for blepharitis, styes, chalazions, and dry eye.
For either type, use a clean washcloth soaked in water (not dripping) and hold it gently over your closed eye for five to ten minutes. Repeat a few times a day as needed. If you’re dealing with an infection, use a fresh cloth each time to avoid spreading bacteria.
A Warning About “Get the Red Out” Drops
Decongestant eye drops that promise to whiten your eyes work by constricting blood vessels on the eye’s surface. They’re fine for occasional use before a job interview or a photo, but regular use creates a rebound effect. When the drops wear off, your blood vessels dilate even wider than before, making your eyes redder. This can happen after days, weeks, or months of regular use, and stopping the drops without other treatment causes a noticeable flare of redness. If you find yourself needing these drops daily, it’s time to figure out what’s actually causing the redness and treat that instead.
If You Wear Contact Lenses
Contact lens wearers should remove their lenses at the first sign of redness, pain, or blurred vision. Continuing to wear lenses over an irritated or infected eye traps bacteria against the cornea and raises the risk of a serious infection called keratitis.
Avoid using redness-reducing drops while wearing contacts. These products contain chemicals that can damage both the lens and your eye over time. Only use drops specifically labeled as safe for contact lens wear. If your lenses were exposed to water (swimming, showering), clean and disinfect them thoroughly, or discard them, before wearing them again. Don’t reinsert your lenses until the redness and any discharge have fully resolved.
Signs That Need Immediate Attention
Most red eye is benign, but certain symptoms signal a potentially sight-threatening problem. Seek immediate care if you notice any of the following:
- Sudden changes in your vision
- Significant eye pain, especially with a headache or fever
- Sensitivity to light combined with nausea or vomiting
- Seeing halos or rings around lights
- A chemical splash or foreign object in the eye
- Swelling in or around the eye that makes it hard to open
- A feeling that something is stuck in your eye that won’t flush out
These can indicate conditions like acute glaucoma, a deep corneal ulcer, or iritis, all of which require prompt treatment to prevent permanent damage.