How to manage infection of the sinuses

A concerned mother recently sent me this email: “Dr Ombeva, my son aged two years has sinuses. He has flu and cough that keeps recurring, especially at night. I have been prescribed nasal saline, piriton, antibiotics but the problem is not going. I am worried. Do you think the sinuses also cause asthma?”

To answer this concerns, we first need to clarify that each one of us has sinuses.