Common forms Superficial<unk>  cause discomfort but generally not serious consequences, as do the deep vein<unk>  (DVTs) that form in the deep veins of the legs or in the pelvic veins. Nevertheless, they can progress to the deep veins through the perforator veins or, they can be responsible for a lung embolism mainly if the head of the clot is poorly attached to the vein wall and is situated near the sapheno-femoral junction. When a blood clot breaks loose and travels in the blood, this is called a thromboembolism. The abbreviation DVT/PE refers to a<unk> E where a deep vein<unk>  (DVT) has moved to the lungs (PE or pulmonary embolism). Since the veins return blood to the heart, if a piece of a blood clot formed in a vein breaks off it can be transported to the right side of the heart, and from there into the lungs. A piece of thrombus that is transported in this way is an embolus: the process of forming a thrombus that becomes embolic is called a thromboembolism. An embolism that lodges in the lungs is a pulmonary embolism (PE). A pulmonary embolism is a very serious condition that can be fatal depending on the dimensions of the embolus. Rare forms While<unk>  of the legs is the most common form,<unk>  may occur in other veins. These may have particular specific risk factors: * Cerebral venous sinus<unk> , cavernous sinus<unk>  and jugular vein<unk> :<unk>  of the veins of the brain and head * Central retinal vein occlusion and branch retinal vein occlusion: despite the name these conditions have much more in common with arterial<unk>  and are not treated with anticoagulants * Paget–Schroetter disease:<unk>  of the veins of the arms (axillary and subclavian veins) * Budd-Chiari syndrome<unk>  of the hepatic vein) *<unk>  of the hepatic portal system, also known as splanchnic<unk> : *<unk>  of the superior mesenteric vein, which may cause mesenteric ischemia (insufficient blood flow to the intestine) * Portal vein<unk>  *<unk>  of the splenic vein * Renal vein<unk> <unk>  of the veins of the kidneys) * Ovarian vein<unk>  Parodoxical embolism Systemic embolism of venous origin can occur in patients with an atrial or ventricular septal defect, or an arteriovenous connection in the lung, through which an embolus may pass into the arterial system. Such an event is termed a paradoxical embolism. When this affects the blood vessels of the brain it can cause stroke.
Venous thrombosis
Migraine
Deep vein thrombosis
Venous ulcer
Thrombophlebitis
Phlebitis
Thrombosis
Lymphangitis