Angiology is the medical specialty dedicated to studying the circulatory system and of the lymphatic system, i.e., arteries, veins and lymphatic vessels.

In the UK, this field is more often termed angiology, and in the United States the term vascular medicine is more frequent. The field of vascular medicine (angiology) is the field that deals with preventing, diagnosing and treating vascular and blood vessel related diseases.

Arterial diseases include the aorta (aneurysms/dissection) and arteries supplying the legs, hands, kidneys, brain, intestines. It also covers arterial thrombosis and embolism; vasculitides; and vasospastic disorders. Naturally, it deals with preventing cardiovascular diseases such as heart attack and stroke. Venous diseases include venous thrombosis, chronic venous insufficiency, and varicose veins. Lymphatic diseases include primary and secondary forms of lymphedema. It also involves modification of risk factors for vascular disease like high cholesterol, high blood pressure.

Cardiovascular risk factors such high blood pressure, elevated cholesterol and others fall under the specialty of vascular medicine.

More Info: en.wikipedia.org