What are the most common orphan diseases?

Written by Editorial Team | Last Updated: August 2026

Orphan or rare diseases encompass thousands of distinct medical conditions that individually affect small patient populations but collectively impact millions globally. Widely recognized examples include cystic fibrosis, amyotrophic lateral sclerosis (Lou Gehrig's disease), Duchenne muscular dystrophy, Huntington's disease, sickle cell disease, Ehlers-Danlos syndrome, Fabry disease, and acromegaly. Because many of these conditions are genetic in origin, patients frequently encounter diagnostic delays, complex clinical management hurdles, and specialized therapeutic access challenges.

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