For millions of Americans, seasonal allergies bring the familiar annoyance of sneezing, itchy eyes, and congestion. But for some, these allergic reactions extend deeper into the respiratory system, ...

Allergies occur when your immune system overreacts to harmless substances, like pollen or pet dander. Allergies to substances like pollen commonly cause sneezing, a runny nose, and itchy eyes. Chronic ...

Tree, grass, and ragweed pollen are common seasonal allergy triggers. Seasonal allergies can cause symptoms such as sneezing, itchy eyes, runny nose, and congestion. Untreated allergies can lead to ...

Medically reviewed by Corinne Savides Happel, MD Key Takeaways Allergies can cause headaches, either as sinus headaches or ...

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, wheezing, ...

Conjunctivitis can occur due to bacterial or viral infection or an allergic reaction. People often refer to bacterial or viral conjunctivitis as pink eye. Infectious and allergic conjunctivitis have ...

About one in 20 people experience bronchitis every year, despite it being a respiratory infection no one wants. Its most common symptoms include wheezing, chest tightness, low fever, fatigue, ...

It can be tricky to determine whether your symptoms are actually the result of a common cold, bronchitis, or another type of infection. How do you know whether your cough and runny nose are signs of a ...