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Related Concept Videos

Gastritis III: Clinical Manifestations and Management01:23

Gastritis III: Clinical Manifestations and Management

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The clinical manifestations of gastritis can vary depending on the cause and type of gastritis, but some common symptoms may include the following.
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Hypersensitivity, also known as a hypersensitivity reaction or allergic reaction, is a condition where the body's immune system reacts abnormally to a foreign substance. Such substances, that cause hypersensitivity are referred to as an allergen, could be something typically harmless to most people, like pollen or certain foods.
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Histamine H2 receptors, which are intricately located on the basolateral membrane of parietal cells, play a crucial role in modulating gastric acid secretion. When released from enterochromaffin-like cells, histamine engages H2 receptors, initiating the cyclic AMP (cAMP) pathway. In this pathway, adenylyl cyclase converts ATP into cAMP, elevating intracellular cAMP levels. The activation of protein kinase A follows, stimulating the proton pump. This stimulation prompts the secretion of hydrogen...
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Peptic Ulcer Disease III: Clinical Manifestations and Diagnostic Studies01:28

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Peptic ulcer disease (PUD) presents with diverse symptoms depending on the location and severity of the ulcer. Clinical manifestations of peptic ulcer include dull pain and a burning sensation in the mid-epigastric region.
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Gastroesophageal Reflux Disease II: Clinical Features and Management01:29

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Gastroesophageal reflux disease, or GERD, is a persistent medical condition that affects many individuals worldwide. Its clinical manifestations can vary greatly, making diagnosis and management challenging for healthcare professionals. The following is a comprehensive overview of the clinical manifestations, assessment, and management strategies for GERD.
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Updated: May 23, 2025

Humanized Mediator Release Assay as a Read-Out for Allergen Potency
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[Suspected histamine intolerance-how to proceed?]

Imke Reese1

  • 1Ernährungsberatung und -therapie Schwerpunkt Allergologie, Ansprenger Str. 19, 80803, München, Deutschland. reese@ernaehrung-allergologie.de.

Dermatologie (Heidelberg, Germany)
|March 10, 2025
PubMed
Summary
This summary is machine-generated.

Self-diagnosed "histamine intolerance" lacks scientific evidence, as oral histamine challenges show no reproducible reactions. Symptoms are often linked to a nocebo effect, not actual food intolerance.

Keywords:
Adverse reactions to foodDietary managementNocebo effectQuality of lifeSelf-diagnosis

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Area of Science:

  • Immunology
  • Gastroenterology
  • Nutritional Science

Context:

  • Histamine intolerance is a frequently self-diagnosed condition.
  • Reactions mediated by histamine suggest food histamine could trigger similar symptoms.
  • Previous studies on oral histamine provocation have yielded inconclusive results.

Purpose:

  • To evaluate the scientific basis of self-diagnosed histamine intolerance.
  • To investigate the reproducibility of symptoms after oral histamine administration.
  • To provide a diagnostic and therapeutic guideline for suspected histamine intolerance.

Summary:

  • Double-blind, placebo-controlled oral provocation tests indicate that orally administered histamine does not trigger reproducible reactions.
  • Symptoms reported in individuals with suspected histamine intolerance often occur after placebo, suggesting a significant nocebo effect.
  • The lack of reproducibility means the criteria for an adverse food reaction are not met.

Impact:

  • The guideline aims to improve digestive function and broaden food choices, rather than confirming histamine intolerance.
  • It emphasizes a pragmatic approach to managing symptoms and improving quality of life for affected individuals.
  • Collaboration with allergologically trained dietitians/nutritionists is recommended for optimal management.