15 month granddaughter coughs excessively at night has runny nose
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http://nationaljewish.org/medfacts/mites.html has GOOD info about how you can start. Another common allergen is cat dander, which can persist in spite of the BEST housekeeping. Some info is at http://nationaljewish.org/medfacts/animals.html
Please have your daughter contact the pediatrician and tell him/her about these troubling symptoms and see what s/he recommends.
Best of luck to all of you.
Starion