Yes, a sinus infection can cause pink eye. In fact, it is one of the most common causes. Sinusitis, which affects the sinuses, can lead to inflammation and infection of the conjunctiva, the clear lining of the eyelids and the inside of the eyelids. This inflammation causes the conjunctiva to appear pink or red due to the presence of blood vessels under the conjunctiva
When a sinus infection occurs, the sinus cavities, which are spaces within the bones of the face that lie behind the nose, become filled with mucus and fluid. This can cause the sinuses to become blocked, preventing normal drainage of mucus and fluid. As a result, the infection can spread to the upper respiratory system,…