Hello. Enlarged adenoids can contribute to persistent nasal blockage, mouth breathing, snoring and recurrent nasal symptoms in children. Morning sneezing also raises the possibility of an allergic component.
Since your son is 11 years old and you mention that he is underweight, I would recommend assessing the severity of the nasal obstruction and also checking for snoring, mouth breathing, disturbed sleep or pauses in breathing at night. These symptoms are important because significant sleep-disordered breathing can affect a child's sleep and overall development.
Homeopathic treatment can be considered as an individualised approach for the associated chronic nasal/allergic symptoms, but the extent of adenoid enlargement and degree of airway obstruction should be properly assessed rather than assuming that medicine alone will shrink the adenoids.
Next Steps
Please share any previous ENT consultation, X-ray/nasal endoscopy report and details regarding snoring, mouth breathing and sleep. A pediatric ENT evaluation is advisable, particularly if the blockage is persistent or there are sleep-related breathing symptoms.
If there is an allergic component, that should also be addressed as part of the overall management.
Health Tips
Keep the child's sleeping environment free from dust, smoke and other known triggers. Do not use prolonged nasal decongestant drops without medical advice.
If there are repeated pauses in breathing, choking/gasping during sleep, significant daytime sleepiness or worsening breathing difficulty, seek prompt medical evaluation