Over 270 passengers and crew members became sick with norovirus on a Royal Caribbean cruise ship this week. As a result, the cruise will end early.
The norovirus, a contagious gastrointestinal illness, sickened at least 145 people at evacuation shelters for the Camp Fire in Northern California.
The causes for all diseases can differ but these can be passed down from your parents.
From Selena Gomez to Gigi Hadid, here are some celebrities who have opened up about the invisible illnesses they battle every day.