If your eyes are red after swimming, it might be "pink eye."

This time of year, when swimming lessons begin at school, is a season when "pink eye" (conjunctivitis caused by adenovirus) tends to increase.
The main symptoms include redness of the eyes, discharge, increased tearing, and swollen eyelids. Cold-like symptoms and fever may also occur.
Conjunctivitis is highly contagious and spreads easily not only in schools and workplaces but also within families. If any family members are experiencing symptoms such as red eyes or discharge, take precautions to prevent infection, such as avoiding sharing towels.
If you have any concerning symptoms, please consider seeing a doctor as soon as possible.