After wrapping up a two-year long world tour, pop icon Justin Timberlake, 44, opened up about a private health battle that’s been affecting him behind the scenes. In a heartfelt Instagram post shared on Thursday, the singer revealed that he has been diagnosed with Lyme disease, a tick-borne illness that can cause lingering and unpredictable symptoms.The announcement came just one day after the conclusion of his tour in Istanbul, marking the end of a musical chapter that spanned more than 70 performances across North America, Europe, and South America.Diagnosis Behind the ScenesTimberlake disclosed that during his Forget Tomorrow World Tour, which promoted his sixth solo album Everything I Thought It Was, he had been quietly “battling some health issues.”“When I first got the diagnosis, I was shocked for sure,” Timberlake wrote. “But 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.”He admitted that the symptoms forced him to reconsider continuing the tour, saying, “I was faced with a personal decision. Stop touring? I decided the joy that performing brings me far outweighs the fleeting stress my body was feeling.”Despite the physical toll, Timberlake pushed through his JT LIVE 25 tour leg, which included festival performances like Lollapalooza Brazil, before finally wrapping things up on July 31.What Is Lyme Disease?Lyme disease is caused by bacteria transmitted to humans through the bite of an infected black-legged tick. It's most common in certain parts of North America and Europe, especially during the warmer months.The most common early sign of Lyme is a red rash that often resembles a bull’s-eye, typically appearing within 3 to 30 days after the bite. The Center for Disease Control and Prevention (CDC), US, notes that the early symptoms can also mimic the flu, fever, chills, headache, fatigue, and muscle aches. If caught early and treated with antibiotics, most people recover completely within a few weeks.However, for some, like Timberlake, symptoms can persist or worsen even after treatment. This condition, sometimes called Post-Treatment Lyme Disease Syndrome (PTLDS), includes ongoing fatigue, nerve pain, cognitive issues, and more.“Lyme can be incredibly tricky because its symptoms overlap with many other conditions,” explained Dr. Christopher Bazzoli, an emergency medicine expert at the Cleveland Clinic, as reported by the New York Times. “When it’s not caught early, it can lead to a wide range of complications, from joint pain to neurological issues.”In some untreated or severe cases, complications can include:Chronic fatigueArthritisHeart palpitationsDizziness or shortness of breathNerve painMemory or concentration problemsAnd in rare instances, meningitisDoctors are still researching why some people recover quickly while others experience long-term effects. For now, treatment usually includes rest, medications for symptom relief, and in some cases, extended antibiotic therapy.Timberlake has now joined a growing list of celebrities, including Avril Lavigne and Shania Twain, who’ve opened up about their experiences with Lyme disease in hopes of raising awareness.Takeaway For You: If you’ve spent time in wooded or grassy areas and experience unusual fatigue, joint pain, or rashes, it’s worth getting checked for Lyme. Early diagnosis can make all the difference.