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2. Histamine intolerance - Wikipedia

   en.wikipedia.org/wiki/Histamine_intolerance

   Histamine intolerance is a presumed set of adverse reactions (such as flush, itching, rhinitis, etc.) to ingested histamine in food. The mainstream theory accepts that there may exist adverse reactions to ingested histamine, but does not recognize histamine intolerance as a separate medical condition that can be diagnosed. [1]

3. Mast cell activation syndrome - Wikipedia

   en.wikipedia.org/wiki/Mast_cell_activation_syndrome

   Mast cell activation syndrome (MCAS) is a term referring to one of two types of mast cell activation disorder (MCAD); the other type is idiopathic MCAD. [1] MCAS is an immunological condition in which mast cells, a type of white blood cell, inappropriately and excessively release chemical mediators, such as histamine, resulting in a range of chronic symptoms, sometimes including anaphylaxis or ...

4. Oral allergy syndrome - Wikipedia

   en.wikipedia.org/wiki/Oral_allergy_syndrome

   Oral allergy syndrome (OAS) or pollen-food allergy syndrome (PFAS) is a type of allergy classified by a cluster of allergic reactions in the mouth and throat in response to eating certain (usually fresh) fruits, nuts, and vegetables. It typically develops in adults with hay fever. [1] It is not usually serious. [2]

5. Dermatographic urticaria - Wikipedia

   en.wikipedia.org/wiki/Dermatographic_urticaria

   Dermographism can be treated by substances which prevent histamine from causing the reaction (i.e. an antihistamine). These may need to be given as a combination of H 1 antagonists, or possibly with an H 2-receptor antagonist such as cimetidine. [6] [7] Over-the-counter vitamin C, 1000 mg daily, increases histamine degradation and removal.

6. Bronchial challenge test - Wikipedia

   en.wikipedia.org/wiki/Bronchial_challenge_test

   A bronchial challenge test is a medical test used to assist in the diagnosis of asthma. [1] The patient breathes in nebulized methacholine or histamine. Thus the test may also be called a methacholine challenge test or histamine challenge test respectively. Both drugs provoke bronchoconstriction, or narrowing of the airways.

7. Histamine - Wikipedia

   en.wikipedia.org/wiki/Histamine

   Commercial laboratories provide a 24-hour urine sample test for 1,4-methyl-imidazolacetic acid, the metabolite of histamine. This test is a valuable tool in assessing the metabolism of histamine in the body, as direct measurement of histamine in the serum has low diagnostic value due to the specificities of histamine metabolism. [48] [49] [50]