Redness in the eyes may be related to eye inflammation, eye fatigue, glaucoma, and intraocular foreign bodies. 1. Eye inflammation: When inflammatory lesions occur in the eyes, such as conjunctivitis, keratitis, iritis or scleritis, the irritation of inflammation may cause redness in the eyes. 2. Eye fatigue: If you are overly tired with your eyes, redness may also appear in your eyes. 3. Glaucoma: acute attack of glaucoma can also cause local congestion of the eyes, which is manifested by the appearance of red blood in the eyes, and may also be accompanied by other discomforts such as soreness and swelling of the eyes. 4. Foreign body in the eye: when the eye enters a foreign body such as iron or wood chips, it is easy to irritate the eye and cause the generation of red bloodshot. As you can see, there are many reasons for redness in the eyes, and if you can’t get relief from resting, it is recommended that you consult a doctor as soon as possible.