What are the causes of reduced sense of smell?

Reduced sense of smell may be caused by environmental irritants, unhealthy lifestyle habits, upper respiratory tract infections, sinusitis, rhinitis, and other factors. It is recommended to seek medical attention promptly, identify the underlying cause, and receive symptomatic treatment under a doctor's guidance. Specific analyses are as follows:

1. Environmental irritants: Prolonged exposure to heavily polluted air or secondhand smoke may adversely affect the nasal cavity, possibly leading to gradually diminished olfactory function and nasal discomfort. It is advisable to ventilate rooms regularly, avoid poorly ventilated environments and smokers, and wear masks outdoors to protect the nasal passages.

2. Unhealthy lifestyle habits: Chronic alcohol consumption and long-term smoking may irritate the nasal mucosa, thereby impairing olfactory function. Patients may also experience symptoms such as nosebleeds and nasal congestion. Quitting smoking and limiting alcohol intake, along with maintaining healthy daily habits, can help alleviate these discomforts.

3. Upper respiratory tract infection: This may be related to pathogen infection, genetic factors, and others. After onset, nasal mucosa may become congested and swollen, accompanied by symptoms such as runny nose, nasal airway obstruction, and reduced sense of smell. Patients are advised to take medications such as ibuprofen capsules, oseltamivir phosphate capsules, and ephedrine hydrochloride-diphenhydramine tablets as prescribed.

4. Sinusitis: This may result from low immunity, bacterial infection, and other causes. During inflammatory episodes, patients may experience swelling and congestion of the nasal mucosa, often accompanied by purulent nasal discharge and reduced sense of smell. It is recommended that patients use medications such as roxithromycin tablets, cefalexin dry suspension, and clindamycin hydrochloride tablets as directed by their physician.

5. Rhinitis: This condition is primarily associated with infection by pathogenic microorganisms or exposure to allergens, which may irritate the nasal mucosa and submucosal tissues after onset. Common symptoms include nasal congestion and runny nose. Patients are advised to take medications such as Xiangju Capsules, Rhinitis Tablets, and Biyuan Tongqiao Granules according to medical instructions.

In daily life, patients should maintain nasal hygiene, regularly rinse the nasal cavity with saline solution, and avoid irritants such as tobacco smoke and chemical substances. Additionally, maintaining appropriate indoor humidity can help reduce nasal dryness and promote recovery of olfactory function.