Justin Timberlake 's announcement that he was diagnosed with Lyme disease has put a spotlight on the condition that impacts nearly 500,000 people in the United States each year, according to the Centers for Disease Control and Prevention.

Justin Timberlake says his recently diagnosed Lyme disease causes him nerve pain and excessive fatigue. Understanding the disease and its cause can keep you safe this summer.

Pop icon Justin Timberlake revealed he has Lyme disease, joining a growing list of celebrities who have gone public with their diagnoses.