A 14-year-old male patient has developed the symptoms of cold for past 4 weeks. The child is showing runny, stuffy and itchy nose and also red, watery and itchy eyes. He has taken over the counter cold medications for 3 weeks but the symptoms did not go away. He is demonstrating additional symptoms of nasal choking and inability to concentrate for the last week. The patient currently appears to be breathing through his mouth.

The family has no pets, no one in the family smokes and has air-conditioning at home. What can be the diagnosis? Can it be rhinitis? How to confirm the diagnosis?