Pop singer Justin Timberlake announced that he has been struggling with Lyme disease, bringing attention to a growing public health threat. Timberlake, 44, said in an Instagram post Thursday that he was “shocked for sure” by his diagnosis after he had been “battling some health issues” and feeling unwell during his Forget Tomorrow World Tour.

Justin Timberlake has announced on Instagram Thursday that he was diagnosed with Lyme disease. The former NSYNC singer shared the news in a post commemorating his two-year Forget Tomorrow tour, which wrapped in Turkey on Wednesday.