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.

A family source tells PEOPLE that the Grammy winner's diagnosis has "brought clarity to a series of unexplained issues" as Biel has been "incredibly supportive"

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.