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 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.

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.