“Pulsatile Tinnitus” vs. Internally Generated Tinnitus

by Dr. Jennifer Gans 

Why this distinction matters

The term tinnitus is used broadly in medicine, but it often refers to two different underlying mechanisms. When these are not separated, patients can become confused—and sometimes unnecessarily alarmed.

Making this distinction clear does two important things:

• It improves understanding
• It improves clinical decision-making

Most importantly, it keeps the focus where it belongs:
what actually determines whether tinnitus becomes bothersome.

 
Two different sources of perceived sound

1) Internally Generated Auditory Percept (Classic Tinnitus)
This is the form most commonly addressed in tinnitus treatment models.

• The sound is generated within the auditory system
• There is no external or mechanical source
• It is not synchronized with the body

What makes this sound bothersome is not the signal itself, but the way the brain responds to it:

• threat interpretation
• heightened attention
• nervous system activation

This is the form of tinnitus that responds directly to:

• education
• reclassification (“this is not dangerous”)
• changes in attention
• regulation of the nervous system

 
2) Heightened Awareness of Internal Bodily Sound (Pulsatile Perception)

This is often labeled “pulsatile tinnitus,” but it reflects a different mechanism.

• The sound is synchronized with the heartbeat
• It often represents perception of normal vascular flow
• In most cases, the physiology is benign

What brings this sound into awareness is not damage—it is detection:

• increased sensory vigilance
• stress
• changes in how the brain filters internal signals

In other words, the system is not broken—it is over-detecting.

 
Are these both “tinnitus”?

By broad medical definition, yes.

Tinnitus is defined as:

the perception of sound without an external source

Since both experiences occur without an external sound, they are grouped together.

However, this definition obscures an important functional difference:

• One is a generated signal
• One is a perceived internal signal

That distinction matters—not because one is more serious, but because it clarifies what is actually happening.

 
Why medicine still groups them together

The reason is not conceptual—it is practical.

A small subset of pulse-synchronous sounds can be associated with identifiable vascular conditions. For this reason, pulse-synchronous tinnitus is typically evaluated once to rule out uncommon but treatable causes.

Importantly:

• The purpose of evaluation is not because it is likely dangerous
• It is because it is one of the few patterns where a physical source can occasionally be identified

For the vast majority of people, nothing concerning is found.

 
What actually determines distress

Despite the difference in origin, both experiences converge at the same point:

The level of distress is determined by how the brain interprets the signal.

Whether the sound is:

• internally generated
  or
• a perceived internal bodily signal

the same mechanisms drive suffering:

• attention
• vigilance
• perceived threat
• nervous system activation

When the brain classifies the signal as important or threatening, it is pulled into awareness and amplified.

When the brain recognizes the signal as non-threatening, it fades into the background.

 
Clinical implication

From a treatment standpoint, this leads to a simple and powerful conclusion:

These are different signals, but they become bothersome for the same reason—and resolve through the same pathway.
That pathway includes:

• accurate understanding of the signal
• removal of threat interpretation
• reduction in vigilance
• normalization of nervous system activation
   

A clear way to explain this to patients

A non-alarmist, accurate explanation:

“There are two ways people can hear sound without anything external causing it.
One is a sound the brain generates—that’s what we usually mean by tinnitus.
The other is becoming aware of normal body sounds, like blood flow.

Both are common. Both are usually benign.
And in both cases, what determines how much it bothers you is how your brain interprets the signal.”
 

Bottom line

• Not all tinnitus comes from the same source
• Pulsatile perception is often awareness of normal internal signals
• Classic tinnitus is an internally generated percept

But in both cases:

The sound is not the problem.
The brain’s interpretation is what determines the experience.

And that is what makes change possible.