---
title: "Start with what you notice. | Eye Health Guide"
description: "Understand common eye symptoms such as blurred vision, red eye, flashes, and floaters, and learn which ones need urgent care."
url: https://eyehealthguide.org/symptoms/
source: Eye Health Guide
licence: "General information only. Cite the URL and the named medical reviewer."
---

Symptom guide

# Start with what you notice.

Symptoms are the way most people first meet an eye problem. This guide helps you understand what a symptom might mean and how urgent it is.

Medical reviewer [Mr Mohamed Mohyudin](https://eyehealthguide.org/reviewers/mohamed-mohyudin/)· Last recorded site review July 6, 2026

### About this review

This page inherits the site’s previous review record. A separate, current article sign-off has not yet been recorded.

[How review works](https://eyehealthguide.org/reviewers/) · [Official biography & credentials](https://mohamedmohyudin.co.uk/author/mohamed-mohyudin/)

Quick answer

Some eye symptoms are harmless, but a few are emergencies. Sudden vision loss, a new shower of floaters or flashes, severe pain, or eye injury need same-day medical advice.

### On this page ⌄

1. Urgent symptoms
2. Common everyday symptoms
3. How we rate urgency
4. All symptoms A–Z
5. Frequently asked questions

## All symptoms A–Z

No matches. Try a different search or browse by category above.

## Urgent symptoms

Seek same-day or emergency care for these.

- Sudden vision loss
- New flashes and floaters
- A curtain or shadow over vision
- Severe eye pain
- Eye injury or chemical splash

## Common everyday symptoms

Usually less urgent, but still worth understanding.

- Dry, gritty or watery eyes
- Blurry near or distance vision
- Eye strain and headaches
- Mild redness or irritation

## How we rate urgency

Each symptom guide explains likely causes and gives a clear urgency level, so you know whether to monitor, book an exam, or seek emergency care.

## Frequently asked questions

### Which eye symptoms are an emergency?

Sudden vision loss, a new shower of floaters or flashing lights, a curtain or shadow over your vision, severe eye pain, or any eye injury need same-day medical care.

### Are floaters always serious?

Occasional floaters are common and usually harmless, but a sudden increase, especially with flashes or a shadow, can signal a retinal problem and needs urgent assessment.

### Why is my vision suddenly blurry?

Sudden blur has many causes, from dry eye to more serious issues. If it is sudden, persistent, or affects one eye, seek prompt medical advice.

### What is the difference between red eye and bloodshot eyes?

They describe the same visible redness, but a painful bloodshot eye with light sensitivity or vision change needs urgent assessment, while mild redness with watering may be conjunctivitis or dry eye.

### When should yellow eyes be checked?

Yellowing of the white of the eye (sclera) often signals jaundice from liver or gallbladder disease. See a doctor promptly — this is usually a medical rather than routine optician issue.

### Can stress cause eye symptoms?

Stress can worsen dry eye, twitching, and migraine-related visual aura. It does not replace the need to check new vision loss, pain, or flashes urgently.

### Should contact lens wearers treat red eyes differently?

Yes. Remove lenses at the first sign of pain, redness, or reduced vision and seek same-day advice. Infections can progress quickly in lens wearers.

### What does double vision mean?

Seeing two images can come from eye alignment problems or, if sudden, more serious conditions including stroke. Sudden double vision with weakness or speech changes is an emergency.

## Explore related sections