Many protesters have become familiar with the short-term pain of exposure to tear gas. For some, it might turn out to be a long-term problem, too. 

While little is known about the long-term impact of tear gas, health experts know plenty about what happens in the short term. Dr. Thomas Wyatt, who practices emergency medicine at Hennepin Healthcare and treated many patients exposed to tear gas last year during protests, spoke at length with Sahan Journal about them.