Bloodshot eyes are usually a symptom of fatigue, irritation or infection. According to the National Institute of Health, "Bloodshot eyes appear red because the vessels in the surface of the white portion of the eye (sclera) become enlarged and irritated." Causes of bloodshot eyes include dryness, allergies, fatigue, strain, sun exposure, dust or foreign objects, infections and trauma. Figure out what is causing your bloodshot eyes, then treat your symptoms to decrease the redness. Place the wash cloth under cold running water. Let the wash cloth get as cold as it can and then wring as much water out as possible. Place the cold washcloth over your closed blood shot eyes. Hold there for two minutes. The cold will shrink the swollen blood vessels in your blood shot eyes. Rest your eyes. When you are reading or using a computer, stop and close your eyes for a few minutes every hour, placing your palms over your eyes and blocking out the light. Rhythmic eye rolling or focusing on an object far in the distance also relaxes your eyes. Resting helps decrease redness due to fatigue or subconjunctival hemorrhage caused by coughing or straining. Usually the redness will clear up after a week or two.