Loss of Smell: Causes and When to Seek Medical Attention

Introduction

The sense of smell contributes significantly to taste perception and safety, including detecting smoke, gas, or spoiled food. Loss of smell (anosmia) or reduced smell (hyposmia) can occur for several reasons.

Common Causes

Viral Infections

Respiratory viruses can inflame the nasal lining and temporarily impair smell.

Nasal Polyps

Polyps can block airflow to the olfactory region of the nose.

Chronic Sinusitis

Persistent inflammation of the sinuses may interfere with smell function.

Head Trauma

Head injuries can damage the olfactory nerves responsible for smell perception.

Neurologic Conditions

Certain neurologic diseases may also affect smell.

When Should You Be Concerned?

Medical evaluation is recommended if:

• Loss of smell lasts longer than 4–6 weeks

• It occurs together with nasal blockage

• It develops suddenly without a clear cause

Diagnosis may involve nasal endoscopy and imaging of the sinuses.

Sources

• American Academy of Otolaryngology–Head and Neck Surgery

• Cummings Otolaryngology: Head and Neck Surgery