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Eye infections can cause pain, discharge, and swelling. However, symptoms and treatment options vary depending on the cause, whether viral, bacterial, or fungal.

If you’ve noticed some pain, swelling, itching, or redness in your eye, you likely have an eye infection. Eye infections fall into three specific categories based on their cause: viral, bacterial, or fungal, and each is treated differently.

The good news is eye infections aren’t hard to spot, so you can seek treatment quickly.

Here’s everything you need to know about the eight most common eye infections so you can figure out the cause and what to do about it.