Allergies occur when your immune system overreacts to allergens like pet dander, pollen, mold, certain foods, or medications. Allergy symptoms may include a runny nose, congestion, coughing ...

One blocked nostril can result from allergies, a foreign object, or side sleeping. More serious causes, like a deviated septum or nasal polyps, may also lead to snoring, nasal-sounding speech, or ...

A check mark. It indicates that the relevant content has been reviewed and verified by an expert Our stories are reviewed by medical professionals to ensure you get the most accurate and useful ...