What causes varicose veins and how are they treated?

Varicose veins are more than just bulging, twisted veins on the legs, they are a sign that vein valves are not moving blood back to the heart as efficiently as they should. When those valves weaken or fail, blood pools, pressure builds, and veins stretch, twist, and become visible under the skin.

At SFL Medical Group, we see varicose veins every day in Miami patients who want both symptom relief and better long-term vascular health. Let’s see what truly causes varicose veins and walk through how we diagnose and treat varicose veins using evidence-based, minimally invasive options.

What are varicose veins?

Varicose veins are enlarged, rope-like superficial veins, most commonly on the legs and feet, that develop when vein walls and valves no longer maintain normal blood flow. They often appear blue, purple, or dark and may bulge above the skin’s surface, especially after standing for long periods.

In healthy veins, one-way valves open to let blood move toward the heart, then close to prevent it from flowing backward. When those valves weaken or become damaged, blood refluxes and pools, creating chronic venous insufficiency, the underlying condition that drives most varicose veins.

What causes varicose veins? The underlying mechanism

The core problem in varicose veins is valve failure inside superficial leg veins. Weak or damaged valves allow blood to fall backward with gravity instead of moving cleanly up toward the heart, which raises venous pressure and stretches the vein walls over time.

As veins dilate, the valves no longer close completely, which worsens reflux and leads to twisted, bulging segments visible on the skin. This cycle of high pressure, wall weakening, and valve dysfunction is what we refer to clinically as chronic venous insufficiency.

Major risk factors for varicose veins

Not everyone with weak valves has the same risk. Over years of research and clinical practice, certain risk factors consistently show up:

Genetics and family history

Family history is one of the strongest predictors of varicose veins. If close relatives have visible leg veins or chronic venous insufficiency, your own vein walls and valves are more likely to be structurally weak.

In many patients, this inherited weakness sets the stage while lifestyle and hormonal changes accelerate the process.

Age and natural wear and tear

As we age, vein walls lose elasticity and valves experience normal wear, making them less effective at preventing backward blood flow. Studies show varicose vein prevalence increases significantly after age 50 and continues to rise with each decade.

Hormonal influences and pregnancy

Female hormones such as estrogen and progesterone relax vein walls, which is why women develop varicose veins more often than men. Pregnancy further increases risk by raising blood volume, adding pressure on pelvic and leg veins, and intensifying hormonal shifts that weaken vein structure.

Hormonal birth control and hormone replacement therapy can add to this effect in some patients, especially when combined with other risk factors.

Obesity and inactivity

Excess body weight increases pressure on leg veins and makes it harder for blood to return to the heart efficiently. A sedentary lifestyle, sitting or standing for long hours without movement, further slows circulation and encourages blood pooling in the calves and thighs.

We often see varicose veins in patients whose work involves prolonged standing, such as healthcare staff, teachers, and retail workers, or prolonged sitting, such as drivers and office professionals.

History of clots or venous disease

Past deep vein thrombosis (DVT) or superficial thrombophlebitis can damage vein valves and walls, leaving behind residual venous insufficiency and visible varicosities. Other chronic venous conditions like venous leg ulcers or long-standing edema often coexist with or develop from untreated varicose veins.

Symptoms: when varicose veins are more than cosmetic

Many people first notice varicose veins as a cosmetic concern, but symptoms often progress over time. Common complaints we hear from patients include:

• Aching, throbbing, or heaviness in the legs that worsens after standing or at the end of the day.
• Swelling around the ankles or lower legs, especially in hot weather or after long periods of inactivity.
• Itching, burning, or restlessness in the legs near visible veins.
• Night cramps or a sense of tightness or pressure in the calves.

Over time, chronic venous insufficiency can also cause skin discoloration, thickening, or eczema-like changes around the ankles, signaling more advanced disease.

Potential complications if varicose veins go untreated

Most varicose veins do not become life-threatening, but they can lead to serious complications when ignored. These include:

• Venous leg ulcers: chronic, painful sores near the ankles that are slow to heal due to long-standing venous hypertension.
• Superficial thrombophlebitis: clots and inflammation in surface veins that cause pain, redness, and warmth.
• Deep vein thrombosis: clots forming in deeper leg veins, which carry a risk of pulmonary embolism if a clot travels to the lungs.
• Chronic edema and skin changes that significantly affect quality of life and mobility.

We encourage patients in Miami to seek evaluation early, before these complications develop or become difficult to reverse.

How we diagnose varicose veins at SFL Medical Group

Diagnosis starts with a focused vascular exam, where we assess visible veins, swelling, skin changes, and symptom patterns. We then typically order a duplex ultrasound, a non-invasive imaging test that shows both vein anatomy and real-time blood flow.

Ultrasound helps us locate refluxing segments, identify any clots, and determine whether deeper venous or arterial disease is contributing to symptoms. This information guides whether conservative care is enough or if you would benefit from minimally invasive vein procedures.

Conservative (non-procedural) treatment options

For many patients with mild to moderate symptoms, we begin with conservative measures that support vein function and relieve discomfort. These approaches are also essential before and after procedures:

• Compression stockings: Graduated compression stockings gently squeeze the legs to reduce swelling and improve venous return.
• Leg elevation: Raising legs above heart level several times a day helps drain pooled blood and lowers venous pressure.
• Regular movement: Walking, calf exercises, and avoiding long periods of standing or sitting encourage better circulation.
• Weight management and healthy diet: Reducing excess weight lowers stress on leg veins, while balanced nutrition supports vascular health.

These strategies do not eliminate existing varicose veins, but they can slow progression, reduce symptoms, and protect long-term vein health.

Minimally invasive procedures for varicose veins

When symptoms persist despite conservative care or when duplex ultrasound shows significant reflux, we discuss interventional treatment options. At SFL Medical Group, our vascular specialists focus on minimally invasive procedures performed on an outpatient basis.

Endovenous laser treatment (EVLT) and radiofrequency ablation (RFA)

EVLT and RFA are thermal ablation techniques that close diseased veins from the inside using controlled heat energy. Guided by ultrasound, we insert a thin catheter into the target vein and deliver either laser or radiofrequency energy along its length, causing the vein walls to collapse and seal shut.

Blood then naturally reroutes to healthier nearby veins, while the treated vein is gradually absorbed by the body. Extensive research shows that EVLT and RFA achieve outcomes comparable to traditional surgical vein stripping, with fewer complications and much faster recovery.

Sclerotherapy (including foam sclerotherapy)

Sclerotherapy involves injecting a specially formulated solution or foam directly into problematic veins to irritate the lining and trigger the vein to close. Over weeks, the sealed vein fades as the body absorbs the tissue and neighboring veins take over blood flow.

We commonly use sclerotherapy for smaller varicose veins and spider veins, often in combination with EVLT or RFA for optimal cosmetic and symptomatic results. For the right veins, sclerotherapy offers excellent clearance with minimal downtime and little to no anesthesia.

Ambulatory phlebectomy and other surgical options

In select cases, especially with larger, bulging surface veins, we may perform ambulatory phlebectomy, which removes segments of the vein through tiny skin incisions under local anesthesia. Although this is more invasive than ablation or sclerotherapy, it remains a safe, effective option for targeted vein removal when needed.

Traditional vein stripping is rarely necessary today, but it can still play a role in complex or recurrent disease when less invasive approaches are not suitable.

Recovery and results: what patients can expect

Most minimally invasive vein procedures at SFL Medical Group are outpatient, meaning patients walk in and out the same day. We typically encourage immediate walking to promote circulation and reduce clot risk, along with short-term use of compression stockings for optimal healing.

Bruising, mild soreness, or a tight sensation along the treated vein are common for a few days, but most people return to usual activities within 24 to 72 hours. Over subsequent weeks to months, symptoms such as heaviness, aching, and swelling usually improve significantly as veins close and circulation normalizes.

Lifestyle tips to reduce risk and support treatment

Even after successful vein treatment, healthy habits are essential to reduce the chance of new varicose veins forming. We emphasize a few core strategies for our Miami patients:

• Stay active with regular walking, low-impact cardio, and calf-strengthening exercises.
• Take movement breaks if your job requires long hours of sitting or standing.
• Maintain a healthy weight to reduce pressure on leg veins.
• Wear compression stockings as recommended, especially during travel or long work shifts.

These practical changes support your procedure results and protect overall vascular health.

When to see a vein specialist in Miami

You should schedule a vascular consultation if you notice any of the following:

• New or worsening varicose veins with pain, heaviness, or swelling.
• Skin discoloration, thickening, or rashes around the ankles or lower legs.
• Non-healing sores or ulcers near the ankles.
• Sudden leg swelling, warmth, or pain that could suggest a blood clot.

Our vascular surgery team at SFL Medical Group in Miami offers comprehensive evaluation, advanced imaging, and a full spectrum of treatments from conservative therapy to cutting-edge ablation and sclerotherapy. We design every plan around each patient’s anatomy, lifestyle, and long-term vascular goals.

If varicose veins are affecting your comfort, confidence, or daily activity, we invite you to connect with us and explore a personalized treatment plan.