Tinnitus is the perception of sound (a ringing, buzzing, or crackling noise) in the absence of an external sound source.
It can be intermittent or chronic, mild or overwhelming, and affects a significant portion of the adult population.

Contrary to popular belief, tinnitus is not just an ear problem: it is a complex neurosensory phenomenon involving the inner ear, the brain, stress, and sleep.

1. Peripheral origin: the inner ear and the cochlea

In most cases, tinnitus begins with damage to the hair cells of the cochlea.

The most common causes are:

• Noise-induced hearing loss (concerts, occupational exposure)

• Age-related hearing loss (presbycusis)

• Ototoxic medications

• Microcirculatory disorders of the inner ear

When these cells are damaged:

• The transmission of the auditory signal becomes incomplete

• Some nerve fibers receive less information

• Abnormal electrical signals appear

The brain then interprets these signals as a continuous sound.

2. Why does tinnitus persist? The role of the brain

The reduction in auditory information triggers a phenomenon of neural plasticity:

• Increased spontaneous neuronal activity

• Excessive synchronization of neural networks

• Hyperexcitability of the auditory cortex

The brain attempts to compensate for the lack of signal… by generating its own internal sound activity.

It is this mechanism that explains why tinnitus becomes chronic, even when the initial cause has stabilized.

3. Stress, emotions, and attention: a major amplifier

Tinnitus is not just auditory. It also involves:

🔸 The limbic system (emotions)

• Anxiety

• Negative emotional stress

• Symptom memory

The more tinnitus is associated with a negative emotion, the more overwhelming it becomes.

🔸 The attentional system

Excessive focus on the perceived noise prevents natural habituation.
➡️ The more you listen to your tinnitus, the more the brain amplifies it.

4. The vicious cycle: tinnitus, stress, and sleep disorders

Chronic stress and sleep disorders play a central role:

• Activation of the stress axis (cortisol)

• Brain hypervigilance

• Difficulty falling asleep

• Reduced ability to habituate

A vicious cycle sets in:

Tinnitus → stress → poor sleep → worsening tinnitus

This is why treatment must address both the emotional and sleep-related aspects.

In this comprehensive approach, certain specific formulas combine active ingredients that target both auditory physiology and sleep balance, such as Audistim Jour/Nuit, which notably includes melatonin to support the nighttime phase when falling asleep is disrupted.

For people who do not have a sleep disorder but wish to address the auditory and oxidative components, a melatonin-free version, such as Audistim Jour, may be considered.

These approaches are part of a complementary and individualized strategy.

5. Oxidative Stress and Microcirculation in the Inner Ear

Scientific data suggest that:

• Oxidative stress contributes to cochlear damage

• Impaired microcirculation reduces local oxygenation

• Hypoxia promotes the persistence of aberrant signals

These mechanisms explain the value of approaches aimed at supporting:

• Cellular protection

• Microvascular function

• Neuronal balance