By Katia Hetter, CNN

(CNN) — As pop star Justin Timberlake concluded his world tour earlier this week, the “SexyBack” singer shared on Thursday in a social media post that he has been grappling with health issues and a diagnosis of Lyme disease .

Timberlake did not disclose which stage of Lyme disease he is experiencing in his Instagram post relaying his diagnosis, but the singer wrote, “At least I could understand why I would be onstage and in a massive amount of nerve pain or, just feeling crazy fatigue or sickness.”

His ordeal, like that of Bella Hadid and other celebrities before him, brings up many questions. What exactly is Lyme disease, and how is it contracted and spread? How is the illness diagnosed and treated? What does it mean when someone has “chronic Lyme”? Is the

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