In-depth

Causes

Allergies

Drug allergy

Pet allergy

Pet allergy, an immune system reaction to an inhaled animal protein, causes hay fever symptoms and may cause allergy-induced asthma.

Risk factors

Food allergy

Food allergy symptoms can make you miserable. Unfortunately, there's no cure — but there are steps you can take to keep your symptoms in check.

Symptoms

Abdominal pain

Find out what causes different types of abdominal pain.

Edema

Symptom Checker

Foot pain? Headache? Sore throat? Skin rash? Use the Symptom Checker to find out what's causing your symptom.

Feb. 14, 2014