World Sarcoidosis Day, also known as World Sarcoidosis Awareness Day, is observed worldwide every year on April 13. Established in 2019 by the Foundation for Sarcoidosis Research (FSR), this day aims to increase awareness of sarcoidosis, a systemic inflammatory disease that can affect various organs, particularly the lungs. The observance includes informative events, fundraisers, and patient conferences designed to educate the public about the disease. Notably, the inaugural World Sarcoidosis Day saw nearly 90 buildings and landmarks across the United States and Canada illuminated in purple, the color associated with sarcoidosis awareness. Participants often wear purple ribbons or t-shirts and share their support on social media using hashtags like #WorldSarcoidosisDay and #StopSarcoidosis.