Stars & Their Diseases: 50 Celebrities With Chronic Health Conditions

Cobie Smulders, known for her role as Robin in "How I Met Your Mother", received a diagnosis of ovarian cancer, leading to surgeries to remove tumors while she was filming season 3 of the show.

William Shatner has been dealing with tinnitus and has become an advocate for finding a cure while also raising awareness about the mental health issues that often accompany this disorder.

In 2001, Slash, the renowned guitarist, received a diagnosis of cardiomyopathy due to drug and alcohol abuse. He was given a prognosis of between 6 days and 6 weeks to live, but he defied the odds and now has a defibrillator implanted inside him.

Tom Cruise was diagnosed with dyslexia at the age of 6, and he graduated from high school as a functional illiterate. He relied on his sister for help with schoolwork. He appeared in movies like "Taps" and "Risky Business" before learning to read in 1986, when he became a Scientologist, coinciding with the release of "Top Gun."

Comedian Mike Birbiglia has been diagnosed as a sleepwalker, and he once jumped through a second-story window while dreaming that a missile was about to hit his hotel. To restrain himself, Birbiglia sleeps in a sleeping bag and wears mittens at night.

Billionaire Richard Branson struggled with dyslexia and was a poor academic student who only attended school until he was 16. On his last day, his headmaster told him he would either end up in prison or become a millionaire.

Actor and former WWE superstar Dave Bautista used to hide inhalers under wrestling rings to cope with his asthma during matches.

Lady Gaga suffers from fibromyalgia, which causes widespread muscle pain along with fatigue and issues with sleep and memory.

Danny DeVito's height is the result of Fairbank's Disease, a rare genetic disorder that affects bone growth.

Daniel Radcliffe, who played Harry Potter, suffers from a debilitating condition called cluster headaches and also has a form of "developmental coordination disorder." On bad days, he struggles with tasks as simple as tying his own shoelaces.