Chlorine helps keep pool water clean, but it can also make swimmers susceptible to eye infections because it irritates the lining of the eyes. Additionally, too many swimmers or improper pool cleaning can cause ear infections when water gets into the ears while swimming.

Restless Leg Syndrome (RLS) is a condition in which the legs are constantly in a state of wanting to move, due to a disorder of the nervous system. Because of this condition, the syndrome also greatly affects sleep, and is considered one of the causes of sleep disorders.