hello, What your doctor is correct because may be the polyps your dad got are not small and they are obstructing the airway.In most cases, nasal polyps respond to treatment with medications or surgery. Because they can recur after successful treatment, however, continued medical therapy is often necessary.Following surgery, you will be observed for about six hours. If a dressing has been used, it will be removed from your nose after a few hours. If there is no bleeding you will be discharged and allowed home to continue your recovery.You will usually be advised to rest for two weeks after surgery, and to avoid crowds to prevent catching an infection. Your surgeon will be able to give you more detailed information and advice.Infection at the site of the surgery and persistent nosebleeds are the most common complications of endoscopic sinus surgery. An infection can usually be successfully treated with antibiotics. If you have persistent nosebleeds, you should contact your surgical team because you may need to go back to hospital for further treatment.Endoscopic sinus surgery has a good track record of success with around 90% of people reporting a marked improvement in their symptoms. However, in around 8% of cases, the polyps grow back after 2-3 years.THANK YOU.