Pulsatile tinnitus is caused by blood flow that becomes turbulent or audible near the ear, most often due to changes in arteries, veins, or the skull bone itself. Unlike regular tinnitus (a constant ringing with no external source), pulsatile tinnitus produces a rhythmic whooshing or thumping that matches your heartbeat. In most cases, there is a specific, identifiable cause, and imaging finds one in over 75% of patients.
How Blood Flow Becomes Sound
Your inner ear sits inside the skull surrounded by blood vessels. Normally, blood flows smoothly and silently through these vessels. When something disrupts that smooth flow, whether a narrowing, a structural defect, or increased pressure, the blood becomes turbulent. That turbulence vibrates through bone and tissue into the cochlea, the part of your inner ear that detects sound. Your brain then registers it as a rhythmic pulse you can hear.
The causes fall into three broad categories: problems with arteries, problems with veins, and structural issues in the skull or inner ear. Each produces a slightly different type of sound and responds differently to simple physical tests, which helps doctors narrow down the source.
Arterial Causes
Arterial pulsatile tinnitus lines up with the pumping phase of your heartbeat. It tends to be louder and more forceful than the venous type, and turning your head or pressing on your neck doesn’t change it. That’s because arteries carry blood under higher pressure and aren’t easily compressed from the outside.
The most common arterial culprit is atherosclerosis, the same fatty plaque buildup that causes heart attacks and strokes. When plaque narrows the carotid artery or its branches near the ear, blood squeezes through the tight spot and becomes turbulent. In one study of 145 patients with pulsatile tinnitus, carotid artery narrowing accounted for 16% of cases. This is especially worth considering in older adults or anyone with cardiovascular risk factors like high blood pressure, high cholesterol, or diabetes.
Less common arterial causes include a tear in the carotid artery wall (dissection), abnormal tangles of arteries and veins (arteriovenous malformations), and an artery that takes an unusual looping path too close to the middle ear. In each case, the core mechanism is the same: disrupted flow creates vibrations that travel through the skull bone into the cochlea.
Venous Causes
Venous pulsatile tinnitus tends to be softer and lower-pitched than the arterial type. It lines up with the relaxation phase of your heartbeat rather than the pumping phase. The key distinguishing feature is that it often changes or disappears entirely when you turn your head, lie down, or press gently on the jugular vein in your neck on the affected side. That compression temporarily stops venous flow, and if the sound goes away, it strongly suggests a venous source.
Idiopathic Intracranial Hypertension
One of the most important venous causes is idiopathic intracranial hypertension (IIH), a condition where pressure inside the skull becomes abnormally high. The elevated pressure impairs the brain’s ability to drain cerebrospinal fluid, the liquid that cushions the brain. Narrowing of the large veins inside the skull, particularly where the transverse and sigmoid sinuses meet, creates a feedback loop: high pressure narrows the veins, which further reduces fluid drainage, which raises pressure even more.
IIH predominantly affects women of reproductive age, with a female-to-male ratio between 4:1 and 8:1. Incidence peaks around age 25. Weight gain is a strong risk factor, and it doesn’t take much. Even a moderate gain of 5% to 15% of body weight has been linked to higher risk, in both obese and non-obese patients. Diagnosis rates in England roughly doubled between 2002 and 2016, rising from 2.3 to 4.7 per 100,000 in the general population and reaching 10 to 20 per 100,000 among obese women.
IIH carries a serious risk: permanent vision loss. The same pressure that causes the whooshing sound also pushes on the optic nerve. Blurry vision, double vision, or brief blind spots alongside pulsatile tinnitus and headaches are warning signs that need prompt medical attention, because the damage to your eyesight can become irreversible.
Sigmoid Sinus Abnormalities
The sigmoid sinus is a large vein channel that runs through the bone right behind your ear. If the bone wall separating it from your middle ear becomes thin or develops a small outpouching (diverticulum), turbulent venous flow transmits directly into the ear. This is one of the more common findings on imaging in people with venous pulsatile tinnitus. Pressing on the neck to compress the jugular vein on the same side typically quiets the sound, confirming the venous origin.
Structural and Bone-Related Causes
Sometimes the blood vessels are perfectly normal, but a structural change in the skull amplifies body sounds that would otherwise be inaudible. The best-known example is superior semicircular canal dehiscence (SSCD), a condition where the thin bone covering one of the inner ear’s balance canals has a gap or is missing entirely.
This gap creates a new pathway for vibrations to enter the inner ear. Bone-conducted sound, including the pulse of blood flowing through nearby vessels, reaches the cochlea much more efficiently than it should. People with SSCD don’t just hear their heartbeat. They may also hear their own voice as unusually loud, their eye movements, their footsteps, chewing, even bowel sounds. This collection of symptoms, sometimes called “bony hyperacusis,” is a strong clue pointing toward SSCD.
Tumors Near the Middle Ear
Vascular tumors called paragangliomas (also known as glomus tumors) are rare but important causes of pulsatile tinnitus. These slow-growing, highly vascular masses arise near the jugular bulb or within the middle ear itself. Because they’re packed with blood vessels, they produce a pulsatile sound that’s often the first and most noticeable symptom.
On examination, a doctor may see a reddish, pulsating mass behind the eardrum. These tumors can erode through the floor of the middle ear and spread toward the jugular vein, the carotid artery, or the base of the skull. They’re almost always benign, but they need treatment because of their location and potential to damage nearby structures, including the hearing and balance organs and the nerves that control swallowing and vocal cord movement.
How Doctors Find the Cause
The first step is usually a careful physical exam. Your doctor will listen over the skull and neck with a stethoscope. If they can hear the same whooshing sound you hear, it’s called “objective” pulsatile tinnitus and strongly suggests a vascular source. They may also press on your neck to see whether compressing the jugular vein changes the sound. A positive result, where the sound fades or disappears, points toward a venous cause and can even predict a good outcome from surgical repair.
Imaging is critical. A focused MRI and MR angiography protocol designed specifically for pulsatile tinnitus can identify a cause in over 75% of cases. CT angiography is also commonly used and is particularly good at detecting bone abnormalities like SSCD or sigmoid sinus wall defects. The choice of imaging depends on what the initial exam suggests.
Unlike regular tinnitus, where the cause is often untraceable and treatment focuses on coping, pulsatile tinnitus has a findable source the vast majority of the time. Many of those causes, from venous sinus narrowing to SSCD to glomus tumors, are treatable. That’s why getting the right imaging matters: this is a symptom where diagnosis frequently leads to resolution.