What Causes Leg Varicose Veins? [The Most Important Causes]

Answering the question of where leg varicose veins start and how they develop depends on various factors such as genetics, lifestyle, environmental factors, physical conditions and underlying diseases.

Varicose veins are a relatively common vascular condition affecting about 20% of the population and nearly one-third of men and women aged 18-64. This condition arises from weakness and insufficiency in leg veins.

As we know veins return blood containing carbon dioxide and waste from the body's tissues to the heart. When vein walls or valves which prevent blood backflow, malfunction due to various reasons, blood doesn't flow fully to the heart, pooling in the veins and causing pressure, swelling and varicosity. Varicose veins can occur anywhere but are most common in the legs due to anatomy, gravity and pressure. Multiple factors can cause leg varicose veins which we will explore.

The Complete Guide to Leg Varicose Veins

Causes of Varicose Veins in the Legs

Various factors can contribute to varicose veins:

Genetic Factors

1. Family History: A key risk factor; if a family member has varicose veins, your risk increases by about 90%.

2. Weak Venous Valves: Some individuals have congenital weakness in venous valves, disrupting blood flow and causing pooling.

3. Ethnicity: Some studies suggest certain ethnic groups are more prone.

Environmental Risk Factors

1. Trauma or Injury: Accidents, impacts or sports injuries can cause varicose veins. Types of injuries include:

   • Leg bone fractures damaging surrounding veins.

   • Ankle sprains injuring small ankle veins.

   • Direct calf trauma affecting deeper veins. These injuries can lead to varicose veins by:

   • Damaging venous valves which prevent reflux, causing pooling, swelling and twisting.

   • Inflaming vein walls, weakening vessels.

2. High Heat and Temperature: Prolonged exposure to intense heat like in jobs under strong sunlight or high temperatures or saunas and hot baths, can dilate veins and increase pressure. If you’re wondering why heat is not good for leg varicose veins, click here.

3. Tight Clothing or Shoes: Tight clothes or shoes restrict blood flow in the legs increasing varicose vein risk.

Lifestyle Factors

1. Prolonged Standing or Sitting: Jobs or habits involving long periods of standing or sitting are significant risks. Learn more: Jobs That Increase the Risk of Leg Varicose Veins

2. Obesity and Overweight: Excess weight pressures leg veins raising varicose vein risk.

3. Pregnancy: During pregnancy, three major factors—hormonal and physiological changes, an increase in intravascular blood volume, and increased weight and pressure on the pelvic area and leg veins—place significant pressure on the leg veins and lead to pregnancy-related varicose veins.

4. Sedentary Lifestyle: Lack of exercise reduces blood flow in the legs increasing varicosity risk.

5. Improper Exercise: Activities putting excessive pressure on the legs like heavy weightlifting can slow blood flow from legs to heart due to abdominal muscle pressure.

6. Poor Diet: Excessive fat, sugar, salt and processed foods can impair vein health and efficiency. Some studies suggest that deficiencies in certain vitamins may also play a role in weakening the structure of veins. In this regard, we recommend the article Which Vitamin Deficiency Causes Leg Varicose Veins?.

7. Smoking and Alcohol: Smoking and alcohol weaken vein walls causing long-term damage.

8. Hormonal Medications: Some hormonal drugs especially birth control pills can contribute.

9. Severe and Sudden Weight Loss: Severe and sudden weight loss, such as that resulting from bariatric surgery or strict diets, may reduce the mechanical pressure caused by obesity.

However, the loss of supportive tissue around blood vessels, a decrease in calf muscle mass and weakening of the muscle pump, hormonal imbalances, and even the risk of dehydration and increased blood viscosity may weaken the venous system and turn rapid weight loss itself into a factor that contributes to the development or worsening of varicose veins.

Read more:Gastric Sleeve Surgery and Leg Varicose Veins

Physical and Disease-Related Factors

1. Diseases: Conditions like diabetes, heart disease, liver disease, kidney failure, blood clotting disorders and chronic constipation can predispose to varicose veins.

2. Blood Clots: Previous clots especially deep vein thrombosis can obstruct veins increasing pressure and leading to varicose veins.

3. Hormonal Changes: Hormones affect vein function making women more susceptible during menstruation, pregnancy or menopause.

4. Gender: Varicose veins are more common in women due to body anatomy, pregnancy and hormonal changes.

5. Age: With age vein elasticity and valve function decrease raising varicosity risk. For this reason, varicose veins are more common in older age groups. However, varicose veins are not limited to older adults, and leg varicose veins in young people may also develop due to one of the factors mentioned above, especially if the person has a family history or other risk factors.

Does Leg Varicose Veins Always Have a Specific Cause?

No. In many people, a single factor cannot be identified as the definitive cause. A person may have a genetic predisposition, while aging or pregnancy may also increase the likelihood of developing varicose veins. In another person, a history of venous injury or a combination of different factors may play a role.

Also, having a risk factor does not mean that varicose veins will inevitably develop. For example, not everyone who spends long hours standing develops varicose veins and not everyone with varicose veins is overweight.

The important point is that risk factors are not the same as direct causes. Some factors are more directly involved in valve dysfunction, while others are only associated with an increased likelihood of developing the condition or with increased venous pressure.

Patients who visit the Dr. Behnam Vaghefi Varicose Vein Treatment Clinic have also developed leg varicose veins for different reasons, although some factors play a greater role than others.

Differences in the Causes of Leg Varicose Veins

Medically, venous problems are divided into two broad categories. Understanding the difference gives us a more accurate perspective:

• Primary varicose veins: This is the most common form of varicose veins, mainly associated with inherited weakness of the blood vessel walls, congenital valve defects, or aging. In this condition, the veins gradually lose their elasticity over time.

• Secondary varicose veins: This type of varicose veins results from a specific prior event or medical condition. For example, a history of deep vein thrombosis (DVT), or blood clots, severe physical injuries, and pelvic masses can obstruct the normal flow of blood and cause secondary varicose veins by significantly increasing venous pressure.

Conclusion

Answering "What’s the best treatment for my varicose veins?" depends on factors like type and severity. A specialist’s accurate diagnosis is essential. Self-treatment or non-specialized approaches may not be wise as the condition can worsen.

FAQs

What Is the Main Cause of Leg Varicose Veins?

A single cause cannot be identified as the cause of leg varicose veins in everyone, because this condition usually develops under the influence of a combination of factors. Dysfunction of the venous valves and the pooling of blood in the veins are the main mechanisms behind the development of varicose veins.

However, factors such as heredity, aging, pregnancy, excess weight, and prolonged standing or sitting can increase the likelihood of developing varicose veins. Therefore, the cause may vary from person to person and depend on a combination of underlying factors and lifestyle conditions.

What Causes Small Varicose Veins in the Legs?

Small varicose veins in the legs, which usually appear as red, blue, or purple lines beneath the skin, may develop from dilated capillaries or small superficial veins. Genetic factors, hormonal changes, aging, and pregnancy may contribute to their development. However, not all visible small veins are true varicose veins, and their exact cause depends on the type of vein and the condition of the blood vessels.

What Could Cause Leg Varicose Veins to Increase or Spread?

An increase or spread of leg varicose veins may be associated with worsening dysfunction of the venous valves and increased pressure in the veins. Family history, aging, pregnancy, excess weight, and prolonged standing or sitting may contribute to this process. However, an increase in the number or size of prominent veins does not always indicate that the disease is progressing to the same extent. If there are significant changes, it is best to have the condition of the veins assessed by a doctor.

Does Being Slim or Athletic Prevent Varicose Veins?

There is a common belief that varicose veins only affect people who are overweight or physically inactive. However, the reality is that even if you maintain a healthy weight and good physical fitness, you may still develop varicose veins due to other factors.