Varicose Veins I: Introduction

Varicose veins result from venous valve incompetence, where weakened vein walls cause the valve ring to enlarge, preventing leaflets from fitting together properly. This allows blood to flow backward, especially when standing, increasing venous pressure and causing further vein distention and the characteristic twisted, dilated appearance.

Primary varicose veins are often idiopathic, resulting from inherent weaknesses in vein walls, and are more common in women. Secondary varicose veins develop from direct injury, deep vein thrombosis, or excessive vein distention, such as esophageal varices caused by portal hypertension or varicoceles in the spermatic cords.

Risk factors include family history, female gender, tobacco use, advancing age, obesity, multiparity, history of venous thromboembolism, occupations requiring prolonged standing or sitting, and previous leg injury. Thrombophilia and phlebitis also increase risk by damaging vein walls and valves, leading to chronic venous insufficiency.

While varicose veins commonly affect the lower extremities, particularly the saphenous veins due to prolonged standing pressure, they can also develop in the esophagus, vulva, spermatic cords, and anorectal region. Congenital varicose veins may arise from chromosomal defects affecting venous system development, as seen in Klippel-Trenaunay syndrome.

Common symptoms include heavy, achy feelings or pain after prolonged standing or sitting, relieved by walking or elevating the limb. Patients may also experience itching, burning sensations, tingling, throbbing, cramp-like sensations, swelling, restless legs, fatigue, and nocturnal leg cramps affecting daily function.

Reticular veins are smaller varicose veins appearing flat, less tortuous, and blue-green in color. Telangiectasias, commonly called spider veins, are small visible vessels generally less than 1 mm in diameter that appear bluish-black, purple, or red, representing milder forms of venous abnormalities.

Congenital varicose veins arise from chromosomal defects and genetic mutations, including deletions, duplications, or mutations in genes like FOXC2 crucial for venous valve formation. These abnormalities cause malformations in vein walls and valves, resulting in improper blood flow and vein enlargement from birth, often associated with syndromes like Klippel-Trenaunay.