Conjunctivitis
What is Conjunctivitis?
Conjunctivitis is an inflammation of the conjunctiva, the thin clear tissue that covers the white part of your eye. This tissue also lines the inside of your eyelids. When the conjunctiva gets inflamed, the tiny blood vessels inside it become more visible. This makes your eye look pink or red, which is why conjunctivitis is often called pink eye.
Pink eye is one of the most common eye conditions. It can happen to anyone at any age. The condition can be caused by viruses, bacteria, allergens, or irritants in your environment. Most cases are mild and clear up on their own within a week or two. However, some types need medical treatment to prevent complications.
Understanding what type of conjunctivitis you have matters because each type needs different care. Viral and bacterial pink eye can spread easily from person to person. Allergic conjunctivitis happens when your immune system reacts to something like pollen, dust, or animal dander. Chemical or irritant conjunctivitis occurs when something like chlorine or smoke bothers your eyes.
Symptoms
- Redness in the white of the eye or inner eyelid
- Increased tears or watery discharge
- Thick yellow or green discharge that crusts over lashes
- Itchy or burning eyes
- Gritty feeling in one or both eyes
- Swollen eyelids
- Sensitivity to light
- Blurred vision due to discharge
Some people have mild symptoms that barely bother them. Others experience intense discomfort that makes it hard to work or sleep. The type and severity of symptoms often depend on what caused the inflammation. Allergic conjunctivitis typically causes more itching, while bacterial types produce more discharge.
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Causes and risk factors
Conjunctivitis has many different causes. Viral infections are the most common trigger and often come with a cold or respiratory infection. Bacterial infections can happen when bacteria enter the eye through touching or from contaminated makeup. Allergens like pollen, dust mites, pet dander, or mold can trigger allergic conjunctivitis in sensitive people. Irritants such as smoke, chlorine, air pollution, or chemical fumes can also inflame the conjunctiva.
Some cases link to nutritional deficiencies. Insufficient biotin intake, for example, can lead to eye inflammation and conjunctivitis. Certain allergens produce specific immune responses that blood tests can detect. High levels of specific IgE antibodies to substances like Bermuda grass or goose feathers may indicate allergic reactions causing pink eye. Poor hygiene, sharing towels or pillowcases, and touching your eyes with unwashed hands increase your risk of getting infectious conjunctivitis.
How it's diagnosed
Doctors usually diagnose conjunctivitis by examining your eyes and asking about your symptoms. They will look at the color and pattern of redness, check for discharge, and ask when symptoms started. Most cases can be identified through a physical exam alone. Your doctor may ask about recent colds, allergies, or exposure to people with pink eye.
For allergic conjunctivitis, specialized allergy testing can identify specific triggers. Blood tests measuring allergen-specific IgE antibodies can reveal reactions to substances like Bermuda grass, tree pollen, or animal feathers. Testing for nutrient levels like biotin may help identify deficiency-related cases. Talk to your doctor about which tests make sense for your situation. While these specialized tests are not part of standard panels, they can provide valuable information about underlying causes.
Treatment options
- Apply cool or warm compresses to reduce discomfort and remove crusting
- Use artificial tears or lubricating eye drops to relieve dryness
- Avoid touching or rubbing your eyes to prevent spread
- Wash hands frequently and avoid sharing towels or pillowcases
- Remove contact lenses until symptoms clear completely
- For allergic types, identify and avoid triggers when possible
- Take oral antihistamines or use antihistamine eye drops for allergy relief
- Address nutrient deficiencies with dietary changes or supplements like biotin
- Use antibiotic eye drops or ointments for bacterial infections as prescribed
- See a doctor if symptoms worsen, vision changes, or pain increases
Frequently asked questions
Most cases of viral conjunctivitis clear up within one to two weeks without treatment. Bacterial conjunctivitis often improves within three to five days with antibiotic eye drops. Allergic conjunctivitis lasts as long as you are exposed to the allergen. Some people have chronic allergic conjunctivitis that comes and goes seasonally.
Viral and bacterial conjunctivitis are highly contagious and spread easily through direct contact. You can catch it by touching contaminated surfaces or sharing items like towels and pillowcases. Allergic and irritant conjunctivitis are not contagious because they result from environmental triggers or immune responses. Washing hands frequently helps prevent spreading infectious types.
Yes, allergies are a common cause of conjunctivitis. When your immune system reacts to allergens like pollen, pet dander, or dust mites, it releases chemicals that inflame the conjunctiva. Blood tests can measure specific IgE antibodies to identify which allergens trigger your symptoms. Avoiding these triggers and using antihistamines can help manage allergic pink eye.
See a doctor if you experience severe pain, vision changes, or intense light sensitivity. Seek care if symptoms last more than a week or get worse instead of better. Newborns with any eye discharge need immediate medical attention. People who wear contact lenses or have weakened immune systems should also see a doctor promptly.
Yes, certain vitamin deficiencies can contribute to eye inflammation. Insufficient biotin intake, for example, can lead to conjunctivitis and other eye problems. Biotin is a B vitamin found in eggs, nuts, seeds, and certain vegetables. If blood tests show low biotin levels, your doctor may recommend dietary changes or supplements to address the deficiency.
Wash your hands frequently with soap and water, especially after touching your eyes. Avoid sharing towels, washcloths, pillowcases, or eye makeup with others. Replace eye makeup and contact lenses that you used while infected. Clean surfaces like doorknobs and countertops regularly with disinfectant.
No, you should stop wearing contact lenses immediately if you develop conjunctivitis. Wearing lenses during infection can make symptoms worse and delay healing. It may also increase your risk of developing more serious eye problems. Wait until your eyes are completely healed and your doctor gives approval before wearing contacts again.
Allergen-specific IgE tests can identify immune reactions to substances like Bermuda grass, tree pollen, or goose feathers. IgG antibody tests may reveal sensitivities contributing to chronic inflammation. Testing biotin levels can identify vitamin deficiencies linked to eye inflammation. These specialized tests help doctors understand why some people experience repeated episodes of pink eye.
Cool compresses can soothe irritation and reduce swelling in most types of conjunctivitis. Artificial tears help flush out irritants and keep eyes moist. Warm compresses may help loosen crusty discharge from bacterial infections. However, home remedies only manage symptoms and do not cure bacterial infections, which need antibiotic treatment.