Inherited problems causes like few valves or valves that do not function properly,abnormalities of the vein wall. The resulting weakness may predispose the valves to separate and become leaky.

When the muscles surrounding the deep veins contract, emptying the deeper veins, a build-up of pressure occurs.This causes even more blood to flow the wrong way from the deep to the superficial veins through faulty valves in the perforator veins.This increases pressure in the superficial veins and causes varicosities.

Blood clots within deep vein (DVT) due to various causes.

Many factors can aggravate the varicose veins.
  • Pregnancy is associated with an increase in blood volume. Also, added pressure on the veins in the legs by the weight of the growing uterus and the relaxation effects of the hormones estrogen and progesterone on the vein walls contribute to the development of varicose veins during pregnancy.
  • Prolonged standing.
  • Obesity or distended belly.
  • Straining: Chronic constipation, urinary retention from an enlarged prostate, chronic cough, or any other conditions that cause a person to strain for prolonged periods of time causes an increase in the forces transmitted to the leg veins and may result in varicose veins.
  • Prior surgery or trauma to the leg: These conditions interrupt the normal blood flow channels.
  • Age: Generally, most elderly individuals show some degree of varicose vein occurrence.

The causes of varicose veins vary from person to person. The major reason for the cause of varicose veins could be due to weak or damaged valves. Some of the causes that can contribute to the risk of developing varicose veins are listed below.

  • Heredity
  • Obesity
  • Lack of exercise
  • Jobs requiring prolonged sitting or standing.
  • High-fat
  • Low-fiber diet
  • Surgery or trauma
  • Infectious disease
  • Pregnancy
  • Hormonal medication
  • Age over 40