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According to the National Heart, Lung, and Blood Institute, varicose veins are swollen veins visible just under the surface of the skin. They most often occur in the legs, but they can form in any part of the body. More »

www.reference.com Health Conditions & Diseases

Varicose veins are caused by age and pregnancy. Having weak valves and vein walls contributes to the formation of varicose veins. According to Mayo Clinic, as people get older their skin loses elasticity and the valves i... More »

www.reference.com Health Conditions & Diseases

Possible causes of varicose veins, which commonly affect the legs and involve pain, include venous insufficiency, leg vein damage or increased pressure in the leg veins, according to WebMD. Pregnant women often develop v... More »

www.reference.com Health Pain & Symptoms
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Spider veins are caused by the swelling of veins close to the surface of the skin. Veins have valves that sometimes break or become weak. This causes a back up of blood, swelling and their typical web-like appearance, ex... More »

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When blood is too thick, it clots more easily, and the potential exists for blockage of the blood flow through the arteries and veins, according to the National Heart, Lung and Blood Institute. This may trigger a heart a... More »

www.reference.com Science Human Anatomy Blood

It is possible to get blood clots in your feet from thrombocythemia or thrombocytosis, according to the National Heart, Lung, and Blood Institute. If blood clots form in the tiny blood vessels of the feet, it makes the f... More »

www.reference.com Health Conditions & Diseases

Under the microscope, red blood cells from a patient with sickle cell anemia are sickle-shaped, meaning that they look like crescents, according to the National Heart, Lung and Blood Institute. Normally, red blood cells ... More »

www.reference.com Health Conditions & Diseases