Feeling a rhythmic pulse or whooshing sound in your ear is a condition called pulsatile tinnitus, and it happens because your ear is picking up the sound of blood flowing through nearby vessels. Unlike regular tinnitus (a constant ringing or buzzing), this type syncs with your heartbeat and has a real, physical source. It accounts for roughly 5 to 10% of all tinnitus cases, and while it can be harmless, it sometimes signals an underlying condition worth investigating.
What Creates the Sound
Your inner ear sits remarkably close to major blood vessels in your head and neck. Normally, blood flows smoothly and silently through these vessels. But when flow becomes turbulent, or when something amplifies the sound of normal flow, the sensory cells in your inner ear can detect that pulsing. The sound then registers as a thumping, whooshing, or humming that keeps time with your heartbeat.
There are two basic ways this happens. First, something changes the blood flow itself, making it louder or more turbulent. Second, something changes how well your ear conducts sound, making normal blood flow suddenly audible. Both routes lead to the same experience: a pulse you can hear.
Blood Vessel Causes
Vascular problems account for the majority of pulsatile tinnitus cases. They fall into a few categories depending on which vessels are involved.
Arterial Sources
Narrowing of the carotid artery from plaque buildup is the most common cause in older adults. When the artery narrows, blood squeezes through a tighter opening, creating turbulence that radiates into the ear. Risk factors include age over 80, high blood pressure, and high cholesterol. Less commonly, a tear in the wall of the carotid artery (called a dissection) causes pulsatile tinnitus in about 5 to 15% of people who experience one. A condition called fibromuscular dysplasia, where artery walls develop abnormally, produces the symptom in over a third of affected patients.
Venous Sources
Veins near the ear are actually the more frequent culprits in many patients. The sigmoid sinus, a large vein that drains blood from the brain just behind the ear, can develop a thin spot or small pouch in its wall. These abnormalities account for roughly 20% of venous pulsatile tinnitus cases. Similarly, if the jugular bulb (where the jugular vein begins, right below the middle ear) sits higher than normal or has a thin bony covering, turbulent venous flow gets transmitted directly into the ear.
Abnormal Connections
Sometimes an abnormal connection forms between an artery and a vein in the membranes surrounding the brain. These connections, called dural arteriovenous fistulas, can produce an extremely loud roaring pulse that is occasionally audible to someone standing nearby. This is one of the more serious causes because it can affect blood drainage from the brain.
Increased Pressure Inside the Skull
A condition called idiopathic intracranial hypertension (IIH) deserves special attention because pulsatile tinnitus is present in about 65% of people who have it. IIH involves elevated pressure of the fluid surrounding the brain, and it most commonly affects women of childbearing age who carry excess weight.
Interestingly, the pulsatile tinnitus in IIH may not come directly from the pressure itself. Research shows that patients whose primary complaint is the ear pulsing actually tend to have lower spinal fluid pressures than those whose main symptoms are headaches or vision changes. The pulse sound may instead arise because the elevated pressure compresses veins in the skull, particularly the transverse sinus, creating turbulence. Up to 94% of IIH patients show narrowing of this sinus on imaging. The relationship between these sinus wall abnormalities and the ear pulse is still being sorted out, but the practical takeaway is that pulsatile tinnitus can be an early warning sign of IIH, sometimes appearing before headaches or vision problems do.
When Your Ear Amplifies Normal Flow
Sometimes nothing is wrong with your blood vessels at all. Instead, a change in how your ear conducts sound makes the normal pulse of arteries at the base of your skull suddenly audible. This happens with any form of conductive hearing loss: earwax buildup, fluid behind the eardrum, a middle ear infection, or a condition called otosclerosis where bone grows abnormally in the middle ear.
Here’s the mechanism: when air conduction of external sounds is reduced, ambient noise no longer masks the faint internal sounds your body produces. Your inner ear still works well and picks up vibrations traveling through bone. So the arterial pulse that was always there, previously drowned out by everyday sounds, becomes noticeable. This also explains why many people notice the pulsing more at night or in quiet rooms, when there’s less background noise to cover it up.
Rare but Notable: Glomus Tumors
Glomus tumors are slow-growing, blood-vessel-rich growths that develop from specialized tissue near the jugular bulb or within the middle ear itself. Because they’re packed with tiny blood vessels, they pulse visibly. A doctor looking into the ear canal may see a reddish mass behind the eardrum that blanches when pressure is applied. These tumors are rare, but they’re one of the more well-known causes of pulsatile tinnitus because their rich blood supply creates a strong, detectable pulse.
What Doctors Look For
Diagnosing the cause involves a combination of physical exam techniques and imaging. During the exam, your doctor may press on different areas of your neck and ask you to turn your head, flex your neck, or hold certain positions. These maneuvers help distinguish between arterial and venous sources. If pressing on the side of your neck (compressing the jugular vein) stops the pulsing, that strongly suggests a venous cause. One study found this test made a venous origin more than five times as likely. If instead the sound stops when pressing behind the ear over a specific artery, that points toward an abnormal arterial connection.
For imaging, MRI with specialized blood-vessel sequences (MR angiography) has greater overall sensitivity for identifying the cause than CT. However, a CT scan of the temporal bone is better at revealing bony abnormalities like a thin wall over the sigmoid sinus, an unusually positioned jugular bulb, or bone diseases. Many centers use both in combination. The MRI protocol can also detect urgent problems like brain swelling or bleeding that occasionally underlie pulsatile tinnitus.
Triggers That Make It Worse
Several everyday factors can intensify the sensation. Lying down increases venous pressure in your head, which is why many people notice the pulsing more at bedtime. Exercise temporarily raises your heart rate and blood pressure, making any turbulent flow louder. Stress can amplify your awareness of the sound and may increase blood pressure, compounding the effect. Anemia is another known trigger because the body compensates for fewer red blood cells by increasing blood flow speed, which creates turbulence, particularly in veins. This produces a humming sound that can sometimes be heard through a stethoscope.
Symptoms That Need Prompt Attention
A pulse in your ear on its own is worth mentioning to your doctor, but certain accompanying symptoms raise the urgency. Vision changes, especially brief episodes of dimming or double vision, can indicate elevated intracranial pressure. A sudden, severe headache alongside new pulsatile tinnitus could suggest a carotid dissection or other acute vascular event. Hearing loss that develops alongside the pulsing, a visible mass behind the eardrum, or a pulse so loud that someone else can hear it all warrant timely evaluation. Pulsatile tinnitus that appears only on one side is more likely to have an identifiable structural cause than bilateral pulsing.
The key distinction from regular tinnitus is that pulsatile tinnitus almost always has a findable, physical source. That makes it more diagnostically useful than the continuous ringing type, and in many cases, treating the underlying cause resolves the symptom entirely.