<s>[INST] MY DAUGHTER HAS A RUNNING NOSE EVERY 2 WEEKS. IT USUALLY STOPS WITH ZYRTEC OR VENTOLIN AND THEN COMES BACK IN 15DAYS. ALSO SOME SAY SHE HAS FOOD ALLERGY . WHAT SHOULD I DO. HOW CAN THIS GO AWAY. SHE WILL TURN 4 YRS IN MAY [/INST] Hi, Thanks for writing in. Several laboratories do a test which allows them to detect which substance is your daughter allergic to. They test quite a few substances. Please get it done. Ask her pediatrician about Brooklyn sodium nasal spray as that will prevent allergies. The only permanent solution is avoiding the allergen totally. Since this may not always be possible, please make sure you keep your house clean; change the pillow covers daily; wash the bed linen in hot water and keep a humidifier in the room. Hope this helps. </s>