###Human: What causes eye redness with pain and headache in uveitis patient? ###Assistant: Hello. For simple allergic conjunctivitis, you can use over-the-counter lubricants, like 0.5 % Carboxymethylcellulose acetate. They usually settle down on their own and will not cause any harm to the eyes. But an allergy on itself will not cause any pain. I recommend that you visit a doctor in case you develop increasing continuous pain, a drop in vision, non-resolution of symptoms within two days.