Bruits - Causes, Treatment & When to See a Doctor

What is Bruits?

A bruit (pronounced “brewt”) is an abnormal, whooshing or swishing sound that can be heard over an artery or vascular bed when blood flow is turbulent. Unlike the normal “lub‑dub” of a heartbeat, a bruit is produced by blood moving irregularly through a narrowed or partially obstructed vessel. The sound is usually detected with a stethoscope during a physical examination, but it can sometimes be heard with a Doppler device or even by the patient’s own ears if it is particularly loud.

Bruits are most often a sign that an artery is narrowed (stenosis) or that there is an abnormal connection between arteries and veins (fistula). While many bruits are benign and require only monitoring, some signal serious underlying vascular disease that can increase the risk of stroke, heart attack, or limb loss.

Sources: Mayo Clinic; American Heart Association (AHA); National Institutes of Health (NIH)

Common Causes

Several conditions can create turbulent blood flow and produce a bruit. The most frequent causes include:

• Carotid artery stenosis – narrowing of the carotid arteries in the neck, often due to atherosclerosis.
• Atherosclerotic peripheral artery disease (PAD) – plaque buildup in the femoral, popliteal, or tibial arteries.
• Renal artery stenosis – narrowing of the arteries that supply the kidneys, leading to hypertension.
• Subclavian artery stenosis – reduced blood flow to the arm, sometimes causing a “subclavian steal” syndrome.
• Arteriovenous (AV) fistula or malformation – abnormal connections between arteries and veins, common in dialysis patients.
• Pregnancy‑related uterine artery bruit – increased blood flow to the uterus can create a transient bruit.
• Hyperthyroidism – increased cardiac output may cause a thyroid bruit over the neck.
• Fibromuscular dysplasia (FMD) – a non‑atherosclerotic arterial disease that often affects renal and carotid arteries.
• Tumors or vascular malformations – highly vascular lesions can generate audible flow.
• Infection or inflammation of arteries (vasculitis) – e.g., Takayasu arteritis, which can cause bruits over large vessels.

Associated Symptoms

Bruits themselves are usually painless, but the underlying condition often produces additional signs. Common accompanying symptoms include:

• Transient ischemic attack (TIA) or stroke‑like symptoms (weakness, speech difficulty, vision loss) when the carotid arteries are involved.
• Leg pain or cramping during walking (claudication) in peripheral arterial disease.
• Sudden onset of arm weakness or coldness in subclavian steal syndrome.
• High blood pressure that is difficult to control, especially with renal artery stenosis.
• Pulsatile tinnitus – a rhythmic noise in the ears that matches the heartbeat.
• Headaches or visual disturbances, particularly with vertebral or carotid bruits.
• Swelling or a pulsatile mass over a fistula or AV malformation.
• Fatigue, palpitations, or heat intolerance with hyperthyroidism‑related bruits.

When to See a Doctor

Because a bruit can signal potentially serious vascular disease, you should schedule a medical evaluation if you notice any of the following:

• Presence of a new or unexplained bruit on the neck, abdomen, or groin.
• Recent changes in vision, speech, or unilateral weakness.
• Unexplained high blood pressure, especially if it is resistant to medication.
• Pain, cramping, or weakness in the legs while walking short distances.
• Pulsatile tinnitus or a whooshing sound in the ears.
• Swelling, redness, or warmth over an AV fistula or surgical site.
• Any sudden, severe pain in the abdomen or flank.

Prompt evaluation helps identify treatable conditions before they progress to more dangerous complications.

Diagnosis

Diagnosing the cause of a bruit involves a combination of history, physical examination, and imaging studies.

1. Clinical History & Physical Exam – The physician will ask about risk factors (smoking, diabetes, high cholesterol), symptoms, and family history. A careful auscultation over the neck, abdomen, and extremities identifies the exact location and character of the bruit.
2. Doppler Ultrasound – A non‑invasive test that uses sound waves to visualize blood flow. It can measure the degree of stenosis and determine whether the flow pattern is turbulent.
3. Computed Tomography Angiography (CTA) or Magnetic Resonance Angiography (MRA) – Provide detailed cross‑sectional images of the vessels, helping to locate plaque, aneurysms, or fistulas.
4. Digital Subtraction Angiography (DSA) – An invasive but gold‑standard imaging technique used when endovascular treatment is being considered.
5. Blood Tests – To assess cholesterol levels, glucose control, kidney function, and inflammatory markers (e.g., ESR, CRP) that might point to vasculitis.
6. Additional Tests – For suspected renal artery stenosis, a renin‑angiotensin‑aldosterone assessment or a renal duplex scan may be ordered.

These investigations help determine the severity of stenosis, the need for intervention, and guide long‑term management.

Treatment Options

Treatment is tailored to the underlying cause, the severity of the stenosis, and the patient’s overall risk profile.

Medical Management

• Antiplatelet therapy (e.g., aspirin, clopidogrel) – Reduces the risk of clot formation in atherosclerotic disease.
• Lipid‑lowering agents (statins) – Stabilize plaque and may modestly reduce bruit intensity.
• Blood pressure control – ACE inhibitors, ARBs, or calcium‑channel blockers are first‑line, especially in renal artery stenosis.
• Smoking cessation – Critical for slowing atherosclerotic progression.
• Diabetes management – Tight glycemic control reduces vascular complications.
• Thyroid medication – For hyperthyroidism‑related bruits, beta‑blockers or antithyroid drugs can normalize cardiac output.

Procedural / Surgical Interventions

• Carotid endarterectomy – Surgical removal of plaque from the carotid artery; indicated for >70% stenosis with symptoms.
• Carotid artery stenting – A less invasive alternative using a balloon‑expandable stent.
• Renal artery angioplasty with stent placement – Improves kidney perfusion and can lower resistant hypertension.
• Peripheral arterial angioplasty or bypass grafting – Restores blood flow to the legs for severe PAD.
• AV fistula ligation or embolization – Treats symptomatic fistulas or malformations.
• Endovascular treatment of fibromuscular dysplasia – Balloon angioplasty often resolves renal artery stenosis in FMD.

Home & Lifestyle Strategies

• Engage in regular aerobic exercise (150 minutes/week) to improve circulation.
• Adopt a heart‑healthy diet rich in fruits, vegetables, whole grains, and omega‑3 fatty acids.
• Maintain a healthy weight (BMI < 25 kg/m²).
• Limit alcohol intake to ≤ 2 drinks per day for men and ≤ 1 drink per day for women.
• Monitor blood pressure at home and keep a log for your clinician.

Prevention Tips

While some causes (e.g., congenital arterial malformations) cannot be prevented, many risk factors for bruits are modifiable:

• Control cholesterol – Aim for LDL < 100 mg/dL (or <70 mg/dL if high risk).
• Quit smoking – Seek counseling, nicotine replacement, or prescription medications.
• Manage hypertension – Follow your doctor’s medication regimen and lifestyle advice.
• Stay active – Exercise improves endothelial function and reduces plaque buildup.
• Routine medical check‑ups – Regular physical exams can detect asymptomatic bruits early.
• Screen for diabetes – Early detection and treatment lessen vascular damage.
• Limit exposure to radiation and contrast agents when possible, especially in patients with pre‑existing kidney disease.

Emergency Warning Signs

If you experience any of the following, seek emergency medical care (call 911 or go to the nearest emergency department) immediately:

• Sudden weakness, numbness, or loss of speech – possible stroke from carotid artery disease.
• Severe, abrupt abdominal or flank pain – could indicate a ruptured aneurysm or acute renal artery occlusion.
• Chest pain radiating to the arm, jaw, or back – may be a sign of myocardial ischemia related to upstream arterial disease.
• Rapidly worsening shortness of breath or chest tightness – could signal pulmonary embolism from an AV fistula.
• Sudden loss of vision in one eye (amaurosis fugax) – often a symptom of transient emboli from a carotid bruit.
• Uncontrolled high blood pressure (systolic > 180 mmHg or diastolic > 120 mmHg) with signs of organ damage (headache, vision changes, confusion).

Timely intervention can dramatically improve outcomes and prevent irreversible damage.

References:

• Mayo Clinic. “Carotid artery disease.” https://www.mayoclinic.org/diseases-conditions/carotid-artery-disease
• American Heart Association. “Peripheral Artery Disease (PAD).” https://www.heart.org/en/health-topics/peripheral-artery-disease
• National Heart, Lung, and Blood Institute. “Renal Artery Stenosis.” https://www.nhlbi.nih.gov/health/renal-artery-stenosis
• Centers for Disease Control and Prevention. “High Blood Pressure.” https://www.cdc.gov/bloodpressure
• Cleveland Clinic. “Bruit: What It Means and When It’s Dangerous.” https://my.clevelandclinic.org/health/symptoms/21957-bruit
• World Health Organization. “Guidelines for the Management of Hypertension.” https://www.who.int/publications/i/item/9789241549953