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A surgery is indicated when medication doesnt work . Have you tried alternative therapy like homoeopathy. If no then please do. Sinusitis
, allergic rhinitis
respond very well to homoepathy.
As for the surgery, recurrence of symptoms is one issue.
Precautions- avoiding irritatants, dust, cold
exposure , any thing that could cause ENT infections.
Complications depends on what pair of sinus they are operating on.