Angiology (from Greek ἀγγεῖον, angeīon, "vessel"; and -λογία, -logia) is the medical specialty which studies the diseases of the circulatory system and of the lymphatic system, i.e., arteries, veins and lymphatic vases, and its diseases. In the UKthis field is more often termed angiology, and in the United States the term vascular medicine is more frequent.