Conjunctivitis or pink eye is the most prevalent cause of eye soreness. It is an eye condition where inflammation occurs in the thin membrane called conjunctiva that covers the inner part of the eyelids and eyeball. Basically, there are three different forms of conjunctivitis. One is the bacterial conjunctivitis, second is viral conjunctivitis, and the third one is chemical conjunctivitis which is triggered by allergens or harsh chemicals that are present in soap, shampoo, etc.