Affected organ Common signs and symptoms Nose Swelling of the nasal mucosa <unk> c rhinitis) runny nose, sneezing Sinuses<unk> c sinusitis Eyes Redness and itching of the conjunctiva <unk> c conjunctivitis, watery) Airways Sneezing, coughing, bronchoconstriction, wheezing and dyspnea, sometimes outright attacks of asthma, in severe cases the airway constricts due to swelling known as laryngeal edema Ears Feeling of fullness, possibly pain, and impaired hearing due to the lack of eustachian tube drainage. Skin Rashes, such as eczema and hives (urticaria) Gastrointestinal tract Abdominal pain, bloating, vomiting, diarrhea Many<unk> ns such as dust or pollen are airborne particles. In these cases, symptoms arise in areas in contact with air, such as eyes, nose, and lungs. For instance,<unk> c rhinitis, also known as hay fever, causes irritation of the nose, sneezing, itching, and redness of the eyes. Inhaled<unk> ns can also lead to increased production of mucus in the lungs, shortness of breath, coughing, and wheezing. Aside from these ambient<unk> ns,<unk> c reactions can result from foods, insect stings, and reactions to medications like aspirin and antibiotics such as penicillin. Symptoms of food<unk>  include abdominal pain, bloating, vomiting, diarrhea, itchy skin, and swelling of the skin during hives. Food<unk> es rarely cause respiratory (asthmatic) reactions, or rhinitis. Insect stings, food, antibiotics, and certain medicines may produce a systemic<unk> c response that is also called anaphylaxis; multiple organ systems can be affected, including the digestive system, the respiratory system, and the circulatory system. Depending on the rate of severity, anaphylaxis can include skin reactions, bronchoconstriction, swelling, low blood pressure, coma, and death. This type of reaction can be triggered suddenly, or the onset can be delayed. The nature of anaphylaxis is such that the reaction can seem to be subsiding, but may recur throughout a period of time. Skin Substances that come into contact with the skin, such as latex, are also common causes of<unk> c reactions, known as contact dermatitis or eczema. Skin<unk> es frequently cause rashes, or swelling and inflammation within the skin, in what is known as a "weal and flare" reaction characteristic of hives and angioedema. With insect stings a large local reaction may occur (an area of skin redness greater than 10 cm in size). It can last one to two days. This reaction may also occur after immunotherapy.
Allergy
Foodborne illness
Hypersensitivity
Food intolerance
Alloimmunity
Bronchiolitis
Pseudoallergy
Scombroid food poisoning