Pop icon Justin Timberlake revealed he has Lyme disease, joining a growing list of celebrities who have gone public with their diagnoses.

Lyme disease is caused by bacteria spread through the bite of infected ticks. Symptoms include rash, fever, headache, extreme fatigue, stiffness in joints, muscle aches or weakness, according to the Mayo Clinic.

Dr. John Aucott, Johns Hopkins Lyme Disease Research Center Director, discusses the symptoms and effects of Lyme disease.