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The exact mechanism of the condition is unknown. Some studies have suggested the itching occurs in response to increased fibrinolytic activity in the skin, [5] [6] inappropriate activation of the sympathetic nervous system, [7] increased activity of acetylcholinesterase, [8] [9] or an increase in mast cell degranulation that releases histamine and other chemicals into the body.
Here's what happens behind the scenes: Your body stores the chemical histamine inside its cells, according to the American Academy of Dermatology (AAD). When you encounter a threat, your immune ...
Symptoms of indoor allergies can occur year-round but tend to be more troublesome during the winter months when children are inside more often. [18] However, outdoor allergies, or seasonal allergies, normally change with the season. [19] The potential symptoms of a food allergy include: [10] [5] Tingling/itching in the mouth
Clemastine is a selective histamine H 1 antagonist. It binds to the histamine H 1 receptor, thus blocking the action of endogenous histamine, which leads to temporary relief of the negative symptoms caused by histamine. [11]
[4] [5] Normally, histamine binds to the H 1 receptor and heightens the receptor's activity; the receptor antagonists work by binding to the receptor and blocking the activation of the receptor by histamine; by comparison, the inverse agonists bind to the receptor and both block the binding of histamine, and reduce its constitutive activity, an ...
Symptoms are thought to be the result of histamine being released by mast cells on the surface of the skin. Despite the lack of antigens, histamine causes the skin to swell in affected areas. If the membrane that surrounds the mast cells is too weak, it will easily and rapidly break down under physical pressure, which then causes an allergic ...