LGD Awareness Day, also known as Lymphangiomatosis and Gorham’s Disease Awareness Day, is observed worldwide every May 26. This day was established to highlight complex lymphatic anomalies, which involve abnormal development or dysfunction of the lymphatic system, and to honor the birthday of Jana K. Sheets, who founded the Lymphangiomatosis and Gorham’s Disease Alliance (LGDA) in 2007. The primary goal of this observance is to inform the public about the challenges faced by patients with these rare disorders and to support research and patient assistance. Activities include educating others about complex lymphatic anomalies, donating to the LGDA or similar organizations, and sharing information on social media using hashtags like #LGDAwarenessDay and #LGDAwareness. Complex lymphatic anomalies include conditions such as generalized lymphatic anomaly, central conducting lymphatic anomaly, Gorham-Stout disease, and Kaposiform lymphangiomatosis, each with distinct symptoms and implications for those affected.