What is the definition or description of: tomato allergy?

Tomato: Tomato allergy is: an allergic (ige mediated) reaction usually to the proteins in the tomato. Symptoms of allergy could be hives/swelling, vomiting, or even anaphylaxis (very unusual for tomato). Allergy testing either by a skin test or blood test for specific ige will confirm an allergy.

Itching: Patients who are allergic to tomatoes can manifest symptoms of itching on the skin or the lips and mouth. Some will get GI symptoms including nausea. Some patients may get hives and rarely patients may develop wheezing or coughing. At it's worst the reaction could cause anaphylaxis including a fall in blood pressure and shock. The latter reaction could be life threatening, requiring adrenalin.