A zebra striped ribbon shows awareness for rare cancer (neuroendocrine tumor or carcinoid cancer), Ehlers–Danlos syndrome (EDS), and rare diseases. Rare disease also use a zebra stripe ribbon because of medical expression “When you hear hoof beats, think horses not zebras” in looking for a common diagnosis vs a rare one for symptoms. Rare disease also uses blue denim ribbon. Neuroendocrine tumours are a heterogeneous group including carcinoid, pituitary tumours, & medullary carcinoma of the thyroid.