Can Your Nose Grow Mold? That Strange Smell? Only You Can Detect It

Have you ever experienced this peculiar situation—

Your surroundings seem perfectly normal, yet you constantly perceive a strange odor inside your nose.

It might smell like rot, mustiness, rotten eggs, or the stench rising from a sewer drain, but you can never pinpoint the source.

Even more confusingly, when you ask people nearby, the typical response is: "I don't smell anything."

This leads many to doubt themselves: Am I just overly anxious? Is it all in my head? Or is something wrong with my sense of smell?

Chances are, it's not a hallucination. Deep within your sinuses, you might have unwelcome residents—fungi.

01

Why Can Only You Smell It?

To understand this, you first need to know what the sinuses look like.

The sinuses are eight "small cavities" hidden around the nasal cavity—the maxillary, ethmoid, frontal, and sphenoid sinuses, one pair on each side. They connect to the nasal cavity through narrow passages and are normally responsible for ventilation, resonance, and reducing skull weight.

Under normal circumstances, these "small cavities" are clean and open. But when fungi settle in the sinuses, the situation changes.

During their metabolic processes, fungi produce odorous gases, much like fermenting food emits a smell. These gases first enter the nasal cavity and, carried by airflow, directly impact the olfactory area located at the top of the nasal cavity—it's like someone placing a piece of stinky tofu right under your nose; of course, you smell it clearly.

However, because the sinuses themselves are relatively enclosed spaces, the odor is wrapped within the facial bones, making it difficult for the smell to diffuse into the outside air. Only when you exhale does a small amount of the odorous gas mix with your breath, but it's quickly diluted by the surrounding air, making it imperceptible to those nearby.

Thus, the situation arises: You are troubled by a foul smell, while those around you are completely unaware.

Descriptions like "the smell of something rotting," "a musty odor," or "the stench of rotten eggs" are often key signals of fungal sinusitis.

02

What is Fungal Sinusitis?

Common sinusitis is caused by bacteria or viruses. Fungal sinusitis, as the name suggests, is caused by fungi.

Fungal sinusitis is classified into four types: Fungus Ball, Allergic Fungal Rhinosinusitis, Acute Invasive Fungal Rhinosinusitis, and Chronic Invasive Fungal Rhinosinusitis. The most common among these is the Fungus Ball type.

You can imagine a "fungus ball" as a clump that grows inside the sinus, composed of layers of fungal hyphae, spores, necrotic tissue, and thick secretions wrapped around each other. Small ones can be the size of a soybean, while large ones can grow to the size of a quail egg or even bigger, emitting a characteristic putrid odor.

Its favorite place to reside is the maxillary sinus.

03

Why Do Fungi Grow in the Sinuses?

Fungi are actually everywhere—in the air, in dust, in air conditioner filters. Their spores are ubiquitous.

Under normal circumstances, the body's nasal cleaning system—nasal cilia and mucus—can clear out these "invaders," preventing any problem.

However, certain conditions can create a "livable environment" for fungi:

① Poor Sinus Ventilation: Narrow or blocked sinus openings lead to poor airflow. A damp, stuffy environment is conducive to fungal growth.

② Chronic Sinusitis: Long-term inflammation can damage the nasal mucosa and alter the sinus environment, making it easier for fungi to take root.

③ Weakened Immune System: When the body's resistance is low, fungi can seize the opportunity to invade.

④ Long-term or Repeated Antibiotic Use: Antibiotics can disrupt the balance of flora within the nasal cavity, giving fungi a chance to proliferate.

⑤ Odontogenic Infection: The maxillary sinus and the upper teeth are "neighbors," separated only by a thin layer of bone. Infections of the tooth root, apical periodontitis, or even issues following a tooth extraction can allow bacteria and fungi to travel through the bone缝隙 into the sinus.

When a sinus becomes moist, enclosed, and poorly ventilated, it's prone to developing mold. Over time, this can form a "fungus ball."

04

Besides the Smell, What Other Symptoms Are There?

Many patients with fungal sinusitis first notice the unusual smell in their nasal cavity. However, other symptoms may also appear:

Unilateral nasal congestion, a persistent feeling that one side of the nose is blocked.

Increased discharge from one nostril, often yellowish or greenish in color.

Facial fullness or headache, a sensation of something being blocked inside the cheekbone.

Occasional dull pain in the upper teeth.

According to statistics from the Journal of Clinical Otorhinolaryngology Head and Neck Surgery, among patients with non-invasive fungal sinusitis, the incidence of unilateral nasal obstruction is 82.3%, purulent nasal discharge is 75.6%, and head/facial pain or fullness is 41.2%. Most patients do not experience a single symptom but rather a combination of several.

05

How to Eject These "Uninvited Guests"?

Doctors typically use a nasal endoscope to examine the interior of the nasal cavity. A CT scan is crucial for diagnosis, as it can clearly visualize fungal masses within the sinuses. A definitive diagnosis requires taking a tissue sample for pathological examination.

If fungal sinusitis is confirmed, the current mainstream treatment worldwide is endoscopic sinus surgery.

Using a high-definition endoscope, the surgeon navigates through the natural nasal passages to precisely open the blocked sinus opening. Under direct visualization, the fungus ball is completely removed, diseased mucosa is cleared, and the sinus is irrigated.

In most patients, the abnormal nasal odor significantly diminishes or disappears after the removal of the lesion, nasal congestion is relieved, and headaches or facial pressure are greatly reduced.

If you are troubled by this mysterious odor,

Stop doubting yourself.

It's not that you're overly sensitive, nor is it psychological.

It's a clear signal from your body.

Instead of being bothered by the smell every day,

Let a professional examination provide the answers.