Conjunctivitis—commonly known as “pink eye”—is one of the most frequent eye conditions affecting both children and adults. It occurs when the conjunctiva, the thin transparent membrane covering the white part of the eye and lining the inside of the eyelids, becomes inflamed. While conjunctivitis is often mild and temporary, recognizing its symptoms early can help prevent complications and reduce the risk of spreading it to others.
This guide explores the full range of conjunctivitis symptoms, how they differ depending on the cause, and when it may be time to seek medical attention.
What Does Conjunctivitis Feel Like?
Most people first notice conjunctivitis because their eye feels “off.” This sensation can vary from mild irritation to noticeable discomfort. The most common early symptom is a gritty or sandy feeling in the eye, as if something is stuck inside. Unlike a foreign object, blinking does not relieve the sensation.
Many individuals also report mild burning or itching, which can worsen throughout the day. These early signs often appear before visible redness becomes obvious.
Redness of the Eye
The hallmark symptom of conjunctivitis is redness in the white part of the eye. This happens because the tiny blood vessels in the conjunctiva become inflamed and more visible.
The redness may:
- Affect one or both eyes
- Appear light pink or deep red
- Spread unevenly across the eye surface
In some cases, redness starts in one eye and then spreads to the other, particularly in infectious forms of conjunctivitis. The intensity of redness does not always indicate severity, but sudden or extreme redness should not be ignored.
Eye Discharge and Crusting
Discharge is one of the most noticeable and sometimes bothersome symptoms of conjunctivitis. The type and consistency of discharge can provide clues about the underlying cause.
Common types of discharge:
- Watery discharge: Often associated with viral conjunctivitis or allergies
- Thick, yellow or green discharge: Common in bacterial conjunctivitis
- Stringy mucus: Frequently seen in allergic conjunctivitis
People with conjunctivitis may wake up with crusted eyelids, making it difficult to open their eyes in the morning. This crust forms when discharge dries overnight and sticks the eyelashes together.
Itching and Irritation
Itching is especially prominent in allergic conjunctivitis, though it can occur in other forms as well. The urge to rub the eyes can be strong, but doing so may worsen inflammation or spread infection.
Irritation can range from mild discomfort to persistent annoyance. For some individuals, it feels like dryness, while others describe a stinging or burning sensation.
Excessive Tearing
Watery eyes are another common symptom. The eye may produce more tears as a response to irritation or inflammation. This can lead to blurred vision temporarily, especially if tears pool on the surface of the eye.
In viral conjunctivitis, tearing is often continuous and may be accompanied by a runny nose or other cold-like symptoms.
Swelling of the Eyelids
Inflammation of the conjunctiva can extend to the eyelids, causing them to appear puffy or swollen. This swelling may be mild or more pronounced, depending on the cause.
In allergic conjunctivitis, eyelid swelling can become significant and may be accompanied by redness and itching around the eyes. In bacterial cases, swelling is often paired with thicker discharge.
Sensitivity to Light (Photophobia)
Some individuals with conjunctivitis develop sensitivity to light, known as photophobia. Bright environments may feel uncomfortable, and people may squint or prefer dim lighting.
While mild light sensitivity is relatively common, severe photophobia may indicate a more serious eye condition and should be evaluated by a healthcare professional.
Blurred Vision
Temporary blurred vision can occur due to excess discharge or tears coating the eye. Usually, blinking clears the vision briefly.
However, persistent or worsening blurred vision is not typical of simple conjunctivitis and may signal a more serious issue, such as involvement of deeper eye structures.