Developer site: The content shown here is test data.

MyEClinic
MyEClinic
Health Dictionary AI Health Chat Find an Online Doctor
A serene Zen garden with raked sand and smooth stones, symbolising clarity and calm

Health Dictionary

Reliable, easy-to-read patient information on common medical conditions — written in plain language, free of jargon, and grounded in current evidence. Browse the most frequent diagnoses, understand what they mean for everyday life, and learn which steps and questions help you have a focused conversation with your doctor.

Back to skin conditions

Hyper-IgM syndrome type 3

Introduction


Hyper-IgM syndrome type 3 is a form of Hyper IgM syndrome characterized by mutations of the CD40 gene. In this type, B cells cannot receive the signal from T cells to switch classes.