LOS ANGELES — Justin Timberlake has been diagnosed with Lyme disease, the former NSYNC star said on Instagram Thursday.

Timberlake shared the news in a post commemorating his Forget Tomorrow tour, which wrapped in Turkey on Wednesday, adding that the disease “can be relentlessly debilitating, both mentally and physically.”

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The “SexyBack” singer, who described himself as a private person, wrote he considered ending the tour when diagnosed, but wrote that he “decided the joy that performing brings me far outweighs the fleeting stress my body was feeling. I’m so glad I kept going.”

Lyme disease is transmitted by Ixodes ticks, also known as deer ticks. It can cause flu-like conditions, neurological problems, joint paint and

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