Sudden sinusitis

My son, who was staying in the dormitory, had a headache so we went to the hospital, and they said it was sinusitis. He said he couldn't attend class because of the headache, but I wonder if sinusitis can suddenly develop even though he never had it when he was young. When he comes home, I will take him back to the hospital.

Are there any good hospitals in the Daejeon and Chungcheong area where I can get sinusitis treatment?