In a healthy body, mast cells (the “lookout” cells of the immune system) only release histamine when they detect a foreign invader, like pollen or venom. In CSU, these cells dump histamine into the ...

Medically reviewed by Corinne Savides Happel, MD Symptoms of food allergies can include itchy, raised areas and swelling ...

UPMC Children’s Community Pediatrics is seeing an increase in cases of viral upper respiratory infections and allergies. Pediatricians at Penn State Health Children’s Hospital are seeing flu, viral ...

Hives are itchy red or white bumps that often stem from an allergic reaction. Unlike some other rashes, hives are not contagious and are an allergic-type reaction. Hives and other rashes can become ...

Please provide your email address to receive an email when new articles are posted on . Fresh or raw fruits, vegetables and nuts may trigger oral allergy syndrome (OAS). OAS often overlaps with tree, ...

Hives that come back daily for 6 weeks or more are called chronic hives, or chronic urticaria. The condition often has no known cause, but allergies, autoimmune conditions, physical stimuli, and ...

An allergy is an immune system overreaction to a substance that would otherwise pose no harm. Doctors may use a physical examination, skin tests, and blood tests to diagnose allergies. Different types ...

Seasonal allergies aren't just for lifelong sufferers anymore. Doctors say it's increasingly common for adults who've never had allergies to suddenly experience symptoms like sneezing, runny nose, and ...

An allergist in Dallas explains the winter allergies that can result from too much time indoors during winter storms, and why ...