Pediatrician for children

Patient: My son is having runny nose problem since long time, some time it will be stopped for a few days against it is restarted, also seems that he is allergenic to dust, Doctor is it a symptom of something serious also is there any permanent cure possibility for this and what are precautions to be taken to get his sickness.

Symptoms: Runny nose, coughing, sneezing, nose blockage, breathing through mouth