The signs and symptoms of conjunctivitis, or pink eye, can vary depending on the cause of the condition and the severity of it. Symptoms can affect either just one eye or both eyes. Conjunctivitis gets its commonly known name of pink eye due to the primary, and most visible, symptom, which is redness in the eye that is easily noticed covering over the white part of the eye. Additional symptoms of conjunctivitis include itching, which is particularly common in the case of allergy conjunctivitis, a gritty feeling in the eye, tearing up of the eye, and an abnormal discharge that comes out during the night and forms a crust that inhibits the ability to open the eye in the morning. There are other medical conditions that can cause a similar redness in the eyes, so people experiencing symptoms such as pain, blurred vision, light sensitivity, and the feeling of having something in their eye should seek medical attention immediately in order to get a proper diagnosis.