The short explanation
A bright red patch on the white of the eye, without pain or change in vision, is usually a subconjunctival haemorrhage. This means a tiny blood vessel under the clear surface of the eye has broken and leaked blood, like a bruise. It looks alarming but is usually harmless and fades by itself over a week or two, often changing colour as it clears. It can happen after coughing, sneezing, straining, vomiting, rubbing the eye, or for no clear reason. It is not a sign of stroke on its own. However, because you take blood pressure medicine, it is a good idea to check your blood pressure, since very high readings can sometimes contribute. If you take blood thinners, or it keeps happening, mention it to your doctor.
What depends on your situation
The parts of this that change from woman to woman. Uncertainty is stated, not hidden.
- Pain, reduced vision, discharge, or redness spreading around the whole eye are not typical and should be checked.
- Eye redness after an injury needs an eye examination.
- Repeated haemorrhages, easy bruising elsewhere, or bleeding gums may need blood tests.
- Signs of stroke are different: face drooping, arm weakness, slurred speech or sudden vision loss.
What this answer cannot determine
The boundary of online education. These need a clinician who can see you.
- This cannot tell you for certain what caused the red patch. A doctor can examine your eye and check your blood pressure.
Questions for your clinician
Take these with you. You can add any of them to an appointment card.
- Is this a subconjunctival haemorrhage?
- Is my blood pressure well controlled?
- Could my medicines be contributing?
- When should I worry if it happens again?
When to seek help
Clinician-approved guidance for this topic. When in doubt, being seen is never the wrong choice.
Emergency — call 112 now
- Call 112 if you have face drooping, arm weakness, slurred speech or sudden vision loss.
Get help the same day
- Get same-day care if the eye is painful, vision is reduced, or it followed an injury.
Book an appointment soon
- Check your blood pressure within a few days.
Raise it at a routine appointment
- Mention it at your next routine visit if it does not recur.
Sources
The evidence this explanation is built on.
- Red eye NHS
- Eye diseases MedlinePlus (US National Library of Medicine)
- Eye care MedlinePlus (US National Library of Medicine)
Who wrote and reviewed this
Every AskHer answer names its author. A clinically reviewed answer also names the clinician who signed it off — if no clinician is named below, it has not been clinically reviewed.
- Author
- AskHer Editorial (AI-assisted draft) AskHer's editorial team — not an individual clinician Works in English, தமிழ், हिन्दी
- Clinical reviewer
- Nobody yet No clinician has signed this answer off, and no person on the editorial team has read it yet. That is what the “Written with AI assistance” label means. It is queued for an editor to read, and then for a clinician who works in this area. The sources it was drafted against are listed above.
- Review status
- Written with AI assistance — not yet reviewed by a person
- Last reviewed
- Not yet reviewed by a person
- Version
- 1
Correction history
Substantive changes are listed, not quietly edited away.
No corrections have been made since this answer was first published.
Did this answer your question?
Whatever you choose is filed against this version of the answer, never against you, and it is never shown as a count.
“Explain more simply” asks you which part was hard to follow, so the author knows what to rewrite. “My question is different” opens a private follow-up with this answer attached.
Saving, following up and reporting are all private. Nothing you do on this page is visible to other readers or to the doctor who wrote it, unless you ask a question.