Brief Answer: Foreign body, Adenoids, Sinusitis, Polyps Detailed Answer: Hi, Thank you for your query. 1. If there is a one sided foul smelling nasal discharge, the first cause to rule out is a foreign body in the nose. 2. Other common causes include adenoid hypertrophy (very common) and sinusitis. 3. Rare causes include Polyps, incomplete nasal development (Choanal Atresia), nasal masses and many rare causes, the description of which is outside the scope of this answer. Is there any history of a blood stained nasal discharge / mucus? 4. I hence recommend that a ENT Specialist examine him again. There are a number of tests such as X-rays, CT Scans, nasal swabs for bacterial (and fungal) culture and a nasal endoscopy under anesthesia which may be done depending upon the clinical findings. 5. You may follow up with the investigation and repeat examination reports here. I hope that I have answered your query. If you have any further questions, I will be available to answer them. Regards.

---

Brief Answer: As below: Detailed Answer: Hi, Thank you for writing back. 1. I have outlined the investigation plan in detail above (in the previous answer). 2. Kindly discuss the same with your doctors and follow up. I hope that I have answered your query. If you have any further questions, I will be available to answer them. Regards.

---