Why is the white part of my eye red without pain or itching?

Redness of the sclera—the white part of the eye—without pain, itching, or discharge is commonly caused by a subconjunctival hemorrhage. This occurs when a small blood vessel beneath the conjunctiva (the transparent membrane covering the sclera) ruptures, allowing blood to pool in the space between the conjunctiva and sclera. It typically appears as a well-defined, bright red patch that may enlarge slightly over the first 24–48 hours before gradually fading over 1–3 weeks, much like a bruise. Importantly, it does not affect vision, cause discomfort, or indicate underlying infection or inflammation.

Subconjunctival hemorrhages are usually benign and spontaneous, often triggered by minor trauma (e.g., vigorous eye rubbing, coughing, sneezing, straining during bowel movements, or lifting heavy objects). They are more common in older adults due to age-related fragility of capillaries and in individuals taking anticoagulants (e.g., warfarin, aspirin, clopidogrel) or antiplatelet agents. Other potential—but less common—causes include systemic hypertension, diabetes mellitus, bleeding disorders (e.g., von Willebrand disease), or ocular surface dryness with microtrauma.

While isolated, asymptomatic scleral redness rarely signals serious disease, evaluation is warranted if there is recurrent hemorrhage, bilateral involvement, associated visual changes, eye pain, photophobia, or systemic symptoms such as easy bruising or prolonged bleeding after minor injuries. A comprehensive ophthalmic examination—including visual acuity testing, slit-lamp biomicroscopy, intraocular pressure measurement, and assessment for signs of uveitis or glaucoma—is recommended in these cases. Blood pressure measurement and, if clinically indicated, coagulation studies or referral to hematology may also be appropriate.

In most instances, no treatment is required beyond reassurance and observation. Artificial tears may be used for comfort if mild irritation is present, but topical vasoconstrictors (e.g., tetrahydrozoline) are unnecessary and potentially harmful with repeated use. Patients should be advised to avoid excessive eye rubbing and to manage modifiable risk factors such as uncontrolled hypertension or constipation. Follow-up is generally not needed unless new symptoms develop or the hemorrhage fails to resolve within three weeks.