Conjunctivitis, commonly called “pink eye,” is an inflammatory eye condition marked by excessive watering, a feeling of irritation, and a hallmark change in color from white to pink or scarlet. Pink eye has numerous causes, including viral and bacterial causes, as well as exposure to certain household or industrial chemicals. Allergies, airborne irritants and air pollutants can also trigger or exacerbate pink eye. Treatment depends on the root cause of the condition; antibacterial eye drops will help cases caused by bacteria, and antihistamines can reduce symptoms caused by allergen exposure. It is important for patients to avoid rubbing their eyes, as bacteria on their hands can worsen the condition.