Venous Hypertension: Symptoms, Causes, Diagnosis and Treatment Options

Venous hypertension is a chronic vascular disease characterized by impaired circulation, edema, and tissue damage as a result of persistently elevated blood pressure in the leg veins. When the valves responsible for returning blood to the heart lose their function (reflux) or when an obstruction forms within the vessel, deoxygenated blood pools in the lower extremities. This hemodynamic disorder is not merely a cosmetic varicose vein issue; today, it is treated with minimally invasive methods performed by Interventional Radiology specialists. Endovascular techniques performed without surgery address the root cause, reduce pathological pressure, and restore healthy blood flow.

What Is Venous Hypertension?

To understand venous hypertension, we must understand our battle against gravity. It is easy for blood pumped from the heart to travel down to the toes—gravity does that for us. However, the challenge begins when that blood must be transported meters upward from the big toe back to the heart. Our veins make an extraordinary effort to accomplish this demanding task. In a healthy circulation, this pressure remains low and blood flows smoothly. But when a disruption occurs in the system, blood cannot move upward, it pools below, and begins to exert tremendous pressure on the vessel walls. This elevated pressure within the veins is what we call venous hypertension.

This increase in pressure is not temporary. When it persists, vein walls dilate, become tortuous, and varicose veins form. However, the real danger is not in the visible veins, but in the damage caused to tissues by the increased pressure deep within. The fluid component of the blood begins to leak out of the vessels, essentially flooding the leg tissues.

Risk factors include:

• Sedentary lifestyle
• Prolonged standing
• Genetic predisposition
• Advanced age
• Obesity
• History of pregnancy
• Previous leg injuries

Why Does Blood Flow in the Legs Become Impaired?

For blood to move upward against gravity, two main mechanisms operate in our body: the calf muscle pump and the venous valves. When we walk, the calf muscles contract, compressing the veins and propelling blood upward. Once the blood moves upward, the one-way valves inside the veins close immediately to prevent it from falling back. Venous hypertension occurs when one or both of these systems fail.

The first scenario is “reflux,” or leakage. If the valves do not close properly, some of the blood pumped upward leaks back down. This constant backward flow increases pressure in the lower veins. The second scenario is “obstruction.” If there is a blockage in the main pathway carrying blood to the heart—such as a previous clot in the iliac veins or external compression—the blood cannot find a way out. As blood accumulates behind the blockage, pressure rises. This can be compared to the swelling that occurs behind a garden hose when its end is pressed shut.

The main causes of this dysfunction include:

• Venous valve insufficiency
• Sequelae of deep vein thrombosis
• External compression on vessels
• Weakness of the muscle pump

Which Symptoms in the Body Indicate Venous Hypertension?

When patients come to us, they often describe a discomfort that is difficult to define. It is not just pain, but an indescribable sense of “restlessness” in the leg. These symptoms may be mild early in the day but can become unbearable as the day progresses due to the effects of gravity. Shoes feeling tight in the evening and sock marks leaving deep impressions are among the most tangible signs of increased pressure.

However, symptoms are not limited to swelling. When blood cells that leak into the tissue under high pressure break down, the iron pigment they contain settles under the skin. This causes rust-colored, brownish discoloration around the ankles. These stains are not merely cosmetic—they indicate impaired skin nutrition and signal an approaching complication.

Common symptoms include:

• Heaviness in the legs
• Swelling that worsens in the evening
• Night cramps
• Itching
• Darkening of the skin
• Hardening around the ankles
• Increase in spider veins
• Non-healing wounds

How Does Tissue Damage and Ulcer Formation Occur?

The tissue-level effects of venous hypertension are highly destructive, and I often describe this process to my patients as “cellular suffocation.” As pressure rises, blood flow slows in the smallest capillaries. This slowing causes leukocytes, the immune cells in the blood, to adhere to the vessel wall and become trapped there. This phenomenon, known medically as “leukocyte trapping,” triggers the cascade of tissue damage.

These trapped cells behave as if there is an infection in the area and begin releasing enzymes that break down tissue. These enzymes disrupt vascular permeability. Large protein molecules that should normally remain inside the vessels—especially fibrinogen—leak into the surrounding tissue. These proteins accumulate around capillaries like a “cuff,” hardening over time. This rigid layer prevents oxygen and nutrients from reaching the tissue. As a result, the skin becomes thin, dry, fragile, and eventually breaks down into non-healing venous ulcers even after minor trauma.

The stages of this process include:

• Increased intravascular pressure
• Leukocyte adhesion
• Enzyme release
• Capillary leakage
• Fibrin accumulation
• Tissue hypoxia
• Skin necrosis
• Ulcer formation

Could Unexplained Left Leg Swelling Be May-Thurner Syndrome?

If a patient presents with swelling only in the left leg along with unexplained pain, the first possibility that comes to mind is May-Thurner Syndrome. This condition is essentially an anatomical misfortune. In human anatomy, the main artery supplying the right leg passes over the main vein returning blood from the left leg. In some individuals, this crossing point is too narrow, and the artery compresses the underlying vein against the spine.

The pressure within the artery is very high, and with each heartbeat, it strikes the vein beneath it like a hammer. As a result of this chronic trauma, adhesions and membranous structures called “spurs” form inside the vein. The vein narrows, and sometimes even becomes completely occluded. Blood cannot exit the left leg efficiently, leading to venous hypertension. These patients are often young and do not experience relief even when using compression stockings, because the issue is not with the valves but with a mechanical obstruction in the main pathway.

Symptoms of May-Thurner Syndrome include:

• Unilateral swelling of the left leg
• Leg pain that worsens with walking
• Development of varicose veins in the left leg
• Recurrent deep vein thrombosis
• Groin pain

How Does Nutcracker Syndrome Affect the Kidneys?

Venous hypertension can affect not only the legs but also abdominal organs. Nutcracker Syndrome operates through a mechanism similar to the tool it is named after. The left renal vein becomes compressed between the aorta (main artery) and the superior mesenteric artery. These two arteries act like the arms of a nutcracker, squeezing the vein between them.

As a result of this compression, blood leaving the kidney cannot drain into the main vein (vena cava). Pressure within the kidney rises rapidly. This elevated pressure strains the delicate vascular structures of the kidney and may cause blood to appear in the urine. More importantly, the trapped blood seeks alternative escape routes. It often flows backward (reflux) into the left ovarian vein and descends into the pelvic region. This leads not only to kidney pain but also to pelvic discomfort.

Consequences of Nutcracker Syndrome include:

• Left flank pain
• Blood in the urine
• Protein leakage in the urine
• Pelvic fullness
• Left-sided varicocele
• Menstrual irregularities
• Chronic fatigue

Is There a Link Between Chronic Pelvic Pain and Venous Hypertension?

Many female patients spend years seeking answers in gynecology clinics. They complain of persistent pain and a sense of fullness in the lower abdomen and groin, as well as discomfort during sexual intercourse. Ultrasounds and examinations appear normal, and no infection is found. The cause of this “invisible” pain is often Pelvic Congestion Syndrome—essentially varicose veins within the pelvis.

Just as varicose veins develop in the legs, they can also form in the veins surrounding the uterus and ovaries. This is commonly seen in women who have had multiple pregnancies or in conditions involving compression, such as Nutcracker Syndrome. The valves in the ovarian veins become incompetent, causing blood to flow downward into the pelvis instead of toward the heart. Enlarged, tortuous clusters of veins—resembling a bunch of grapes—form around the uterus. These vessels press on nerves, causing the characteristic undiagnosed pain.

Symptoms of pelvic venous hypertension include:

• Chronic pelvic pain
• Severe menstrual cramps
• Pain during intercourse
• Prolonged aching after intercourse
• Frequent urge to urinate
• Varicose veins around the vulva
• Atypical varicose veins on the back of the legs

Which Methods Are Used for Diagnosis?

The first-line method for diagnosing venous diseases is always Color Doppler Ultrasonography. Performed while standing, this test is excellent for detecting valve insufficiency (reflux) in the legs. However, when it comes to abdominal veins—such as in May-Thurner or Nutcracker syndromes—ultrasound may be insufficient. Intestinal gas can obscure the image, and bones can hide the vessels.

Computed Tomography (CT) and MR venography provide a roadmap, but since these are performed with the patient lying down, they may not reflect the true dynamic state of the veins. This is where IVUS (Intravascular Ultrasound), one of the most powerful tools in interventional radiology, comes into play. IVUS is a miniature camera inserted into the vessel via a thin wire. It visualizes the vein from the inside rather than from the outside, allowing us to measure the degree of narrowing, detect residual clots, and assess external compression with millimetric precision.

Imaging methods include:

• Color Doppler Ultrasonography
• CT Venography
• MR Venography
• Conventional Venography
• Intravascular Ultrasound

How Is Stenting Performed for Blocked Veins?

If the cause of venous hypertension is a mechanical narrowing—such as in May-Thurner Syndrome—medication alone cannot resolve the issue. A physical problem requires a physical solution. Venous stenting, performed in interventional radiology, is a revolutionary minimally invasive treatment that addresses this problem without surgery.

The procedure is performed in an angiography suite while the patient is awake. Access is typically gained through the groin or neck using a small needle puncture. Specialized catheters are advanced to the narrowed segment, which is first expanded using a balloon. Then, a metal mesh structure called a “stent” is placed to maintain patency. Venous stents differ from arterial stents—they are made from a highly flexible yet compression-resistant alloy (Nitinol). Once deployed, the stent pushes the vessel wall outward, creating a wide tunnel for blood flow. As soon as flow improves, the pressure behind the obstruction drops.

Key features of the stenting procedure include:

• Performed under local anesthesia
• No incision or sutures required
• Short procedure time
• Minimal hospital stay
• Immediate hemodynamic improvement

Does Closing Leaking Veins Disrupt Circulation?

Patients often ask, quite reasonably: “Doctor, if you close that vein, where will the blood go?” The answer lies in the body’s remarkable capacity for compensation. The veins we treat and close (such as the saphenous vein or an incompetent ovarian vein) are already dysfunctional. They can no longer effectively transport blood to the heart; instead, they allow backward flow and burden the system. In other words, they are no longer part of the solution, but part of the problem.

When we close these faulty veins using methods such as laser, radiofrequency, adhesive (glue), or coil, the body adapts intelligently. Blood is redirected to nearby healthy deep veins with intact valves. These deep veins have a large capacity and can easily handle the additional blood flow. As a result, closing the defective pathway improves overall circulation by enhancing flow through the main channels.

Closure methods include:

• Endovenous Laser Ablation
• Radiofrequency Ablation
• Foam Sclerotherapy
• Cyanoacrylate Adhesive
• Coil Embolization

Is Interventional Treatment Necessary in Case of Clotting?

Deep Vein Thrombosis (DVT) represents the most acute and dangerous form of venous hypertension. When a major vein is blocked by a clot, pressure rises suddenly. Standard anticoagulant therapy is life-saving, as it prevents the clot from growing and traveling to the lungs. However, anticoagulants do not dissolve the existing clot immediately; instead, they rely on the body’s natural mechanisms to gradually clear it.

Unfortunately, during this waiting period, the clot can adhere to and damage the delicate valves within the vein. Once these valves are damaged, the condition becomes irreversible, leaving the patient with lifelong Post-Thrombotic Syndrome. For this reason, in large and recent clots extending to the groin level, interventional radiologists often adopt a more aggressive approach. Using thrombectomy devices, we enter the vein, break up the clot, and remove it through suction. The goal is to restore the vessel to its original state and preserve valve function.

Clot removal methods include:

• Catheter-Directed Thrombolysis
• Mechanical Thrombectomy
• Pharmacomechanical Thrombectomy
• Aspiration Thrombectomy
• Ultrasound-Assisted Thrombolysis

What Is the Recovery Process After Treatment?

One of the greatest advantages of interventional radiological procedures is the rapid return to normal life. These treatments do not involve large surgical incisions, the risks of general anesthesia, or prolonged hospital stays. After varicose vein treatments or pelvic embolization, patients can walk out of the hospital on their own. Patients who receive stents are usually observed overnight and discharged the next morning.

However, treatment does not end with the procedure itself. Especially in patients with stents, it is essential to use anticoagulant medication for a certain period (typically 6 months to 1 year) to keep the stent open. In addition, compression stockings—one of the best allies of the venous system—help reduce edema and maintain vessel diameter. I always tell my patients: we have opened the road, but for traffic to flow smoothly, you must stay active, drink plenty of water, and take your medications regularly.

Post-treatment recommendations include:

• Engaging in regular walking
• Drinking plenty of water
• Wearing compression stockings consistently
• Taking anticoagulants regularly
• Avoiding prolonged immobility
• Staying away from smoking
• Maintaining an ideal weight
• Attending regular follow-up visits

Prof. Dr. Özgür KILIÇKESMEZ

Prof. Dr. Özgür Kılıçkesmez is one of Türkiye’s leading interventional radiology and neuroradiology specialists, focusing on minimally invasive endovascular treatments. His primary areas of expertise include aneurysm and stroke treatments, embolization procedures, non-surgical treatments of thyroid and parathyroid diseases, interventional oncology, and peripheral vascular interventions. He currently serves as the Head of the Interventional Radiology and Neuroradiology Department at Istanbul Memorial Göztepe Hospital.
Graduating from Istanbul University Cerrahpaşa Faculty of Medicine in 1997, Prof. Dr. Kılıçkesmez received advanced training in interventional radiology and oncology as a Clinical Fellow at London Guy’s & St Thomas’ and King’s College Hospital between 2012 and 2013. He earned the title of Professor in 2020 and, in the same year, became the Founding Interventional Radiologist at SBÜ Çam and Sakura City Hospital. He also holds the EBIR (European Board of Interventional Radiology) certification.
Prof. Dr. Kılıçkesmez has 94 international and 40 national publications and over 2500 citations. He serves as a reviewer for prestigious journals such as the American Journal of Roentgenology (AJR) and Diagnostic & Interventional Radiology. With his clinical and academic expertise, he is a nationally and internationally recognized authority in stroke treatment, brain aneurysm, embolization, tumor ablation, and minimally invasive treatments of thyroid/parathyroid diseases.