This document lists and describes various potential medical causes of a bad smell in the nose during breathing, including malignancy, dental infection, sinusitis, a foreign body in the nose, atrophic rhinitis, maggots in the nose, tonsillitis, nasal diphtheria, rhinitis caseosa, and tuberculosis. Common symptoms associated with these conditions are foul smelling discharge, nasal blockage, pain, and difficulty swallowing. The document provides details on symptoms and characteristics for each medical cause.

1. Bad smell in nose

2. Reasons for Bad smell during breathing
● Malignancy
● Dental infection
● Sinusitis
● Foreign body inside nose
● Atrophic rhinitis
● Maggots in nose
● Tonsillitis
● Nasal diphtheria
● Rhinitis caseosa
● Tuberculosis

3. Malignancy
● An intranasal (inside the nose) or intraoral (inside the mouth)
malignancy can produce foul smell, that can be perceived as
faeces smell by the nose.
● Malignancy can be painless and without any symptoms.
Malignancies of paranasal air sinuses also produce foul odor.

4. Dental infection
● A tooth decay can produce bad smell. Dental infection usually
produces significant pain.
● Food particles get collected inside the decayed tooth and hence
cause the bad smell.

5. Sinusitis
● Chronic sinusitis can cause constant post nasal drip and
purulent discharge (pus discharge). This results in foul odor.
Maxillary sinusitis commonly produces foul odor.
● Sinusitis will have other symptoms like headache, facial pain,
nasal blockage, post nasal drip, etc.

6. Foreign Body inside Nose
● A foreign body which has got stuck inside nose without being
removed for many days will produce purulent discharge and
smell.
● The discharge will be from one side of the nose. It is common
among kids. Foreign body produces nasal block.

7. Atrophic rhinitis
● It is a disease where the normal space inside the nose gets
increased due to destruction of the anatomy. Also the condition
causes merciless anosmia (loss of sensation of smell).
● The sufferer cannot perceive any smell but the people around
him can get the extreme foul odor emanating from the patient's
nose.
● Atrophic rhinitis also presents with crusting inside nose and nose
block.

8. Maggots in nose
● Maggots are larval stage of fly (chrysomia). Maggots usually
occur in association with atrophic rhinitis.
● Fly lays its eggs inside nose leading to maggots inside nose. They
are attracted to the foul odor and they themselves aggravate the
odor.

9. Tonsillitis
● Pus accumulated over the tonsil can cause bad smell.
● Tonsillar enlargement with infection and consequent foul breath
is common in many children.
● Other symptoms of tonsillitis include fever, throat pain, enlarged
lymph nodes of neck, difficulty and pain while swallowing.

10. Nasal diphtheria
● Nasal diphtheria can produce foul odor. Diphtheria produces a
membrane over the affected mucosa.
Rhinitis caseosa
● It is a destructive disease producing foul odor. It was thought to
be a fungal disease, exact etiology is still not clear.
Tuberculosis
● TB of nasal mucosa produces granulomatous inflammation and
caseating necrosis, consequent death of tissues and foul smell.

11. References
Source Credit-->>
https://www.icliniq.com/qa/bad-odor-in-nose/i-have-bad-faeces-smel
l-coming-from-my-nose-when-i-breathe-what-could-be-all-possible-c
auses
consult an ENT otolaryngologist online.--->
https://www.icliniq.com/ask-a-doctor-online/ENT-Otolaryngologist

12. THANK YOU