This chapter discusses different various types of venous diseases. Venous disease in India is synonymous with varicose veins because these are common. Varicose veins result from incompetence of the venous valves and most often involve the lower limbs. A vein is varicose when it becomes elongated, tortuous and dilated, either due to valvular incompetence or weakening of vein walls. Apart from lower limbs, the other sites where varicosities of veins are observed, are spermatic varicocele, esophageal and gastric varices, vulval varices and varices of the hemorrhoidal venous plexuses. The chapter discusses only varicose veins of the lower limbs. The procedure to determine the venous ailments involves physical examination, including an observation of the limbs, if there is any swelling in the involved limb and the skin, which may show the presence of nevus or port-wine staining. The chapter suggests pathological tests such as the Perthe’s test, multiple tourniquets and testing of the short saphenous system.