http://www.niddk.nih.gov/health/kidney/summary/hypotens/hypotens.htm
There is a fact sheet here about risk factors leading to and the dangers of high blood pressure. This has been produced at a relatively non-technical level.

http://www.sciam.com/1999/0299issue/0299cooper.html
This is an article from Scientific American looks into the origin of high blood pressure in African Americans. It compares the incidence of the condition in people living in West Africa and compares it to the frequency in people of Sub-Saharan African descent living in North America.

http://www.ninds.nih.gov/patients/Disorder/STROKE/strokehp.htm
This site details the signs of stroke and its prevention and treatments. Some of the information is also provided in Spanish.

http://www.crha-health.ab.ca/hlthconn/items/phle-thr.htm
This page from the Calgary Regional Health Authority explains phlebitis and thrombosis. It discusses the different types of veins and the risk factors, causes, and treatments of phlebitis.

http://healthy.net/library/Books/Healthyself/varicoseveins.htm
Worried about varicose veins? This pamphlet will explain their causes, prevention, and self-care. There is also a flow-chart with a series of questions to help you decide whether you should see a physician or not.

http://www.scvir.org/patient/pci/page10.htm
This is a pamphlet from the Society of CV and Intervention Radiologists about peripheral vascular disease. The blood slows in the arms and legs and there is cold and numbness in the affected limb. The page includes a self-test as well as information about treatment and prevention.