My red eyes

I recently noticed that my two eyes suddenly became red. Kindly let me know what could cause this. I am a 20-year-old university undergraduate who is not into drinking or smoking.

Goriola (by SMS)

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Sudden development of red eyes happens to a lot of people every now and then. Your eyes get red when the tiny blood vessels on the surface of the eyes expand and turn the whites of one or both eyes a pink or reddish tint. Many things can cause it, like untreated high blood pressure, a night of heavy drinking, or a physical injury to your eye. But if you haven’t had too much alcohol, or scratched or poked your eyeball recently, there are other possibilities. Allergy triggers may make your eyes red. Outdoor causes include pollen from grasses and trees. Indoor triggers include pet dander, dust or mold, or irritants like perfume and smoke. In these cases, you need to see a eye doctor for proper check up.