Which can be found in the legs, arms, veins of the internal organs (kidney, spleen, intestines, liver, pelvic organs), in the brain (cerebral vein thrombosis), in the kidneys (renal vein thrombosis), or in the lungs (pulmonary embolism).
Deep vein thrombosis
Deep vein thrombosis (DVT) is a blood clot occurring in a deep vein (including upper extremity — arms — and lower extremity — legs. Even though deep vein thrombosis itself is not life-threatening, the blood clot has the potential to break free and travel through the bloodstream, where it can become lodged in the blood vessels of the lung (known as a pulmonary embolism). This can be a life-threatening condition.
Superficial venous thrombosis or phlebitis
Superficial venous thrombosis or phlebitis is a blood clot that develops in a vein close to the surface of the skin. These types of blood clots do not usually travel to the lungs unless they move from the superficial system into the deep venous system first. Typically, however, they cause pain.
Chronic venous insufficiency
Chronic venous insufficiency is characterized by pooling of blood, chronic leg swelling, increased pressure, increased pigmentation or discoloration of the skin, and leg ulcers known as venous stasis ulcer.
Varicose and spider veins
Varicose and spider veins are abnormal, dilated blood vessels caused by a weakening in the blood vessel wall.
Ulcers are caused by static blood flow or venous stasis ulcers. Ulcers are wounds or open sores that will not heal or keep returning. Venous stasis ulcers are located below the knee and are primarily found on the inner part of the leg, just above the ankle.