Former Olympic gymnast Mary Lou Retton has been hospitalized for a rare form of pneumonia that has prevented her from breathing on her own. Her daughters have shared updates on her health on their Instagram stories and have set up a crowdfunding page to help cover her medical costs. The U.S. Olympic and Paralympic Committee has also offered assistance to Rettons family through its relief fund. Pneumonia is a common illness that can affect people of all ages, causing more than 50,000 deaths and a million hospitalizations each year in the United States alone. Symptoms of pneumonia include cough, fever, and difficulty breathing, and it can be treated with antibiotics and other medications. It is not clear what specific type of pneumonia Retton has, but her daughters have described it as a rare form.