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Rare diseases

Rare diseases: Introduction

Any condition that only occurs rarely in the general population. Generally a condition is considered rare if there is a prevalence of less than 200,000 people in the US each year. An estimated 25 million (1 in 10) people in the US suffer from a rare disease. There are thousands of rare diseases including Addison's disease and Mallory-Weiss syndrome. ...more »

Symptoms of Rare diseases

  • Symptoms can vary considerably depending on the particular disease involved.
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Rare diseases: Related Patient Stories

Rare diseases: Complications

Read more about complications of Rare diseases.

Causes of Rare diseases

Read more about causes of Rare diseases.

More information about causes of Rare diseases:

Disease Topics Related To Rare diseases

Research the causes of these diseases that are similar to, or related to, Rare diseases:

Evidence Based Medicine Research for Rare diseases

Medical research articles related to Rare diseases include:

Click here to find more evidence-based articles on the TRIP Database

Research about Rare diseases

Visit our research pages for current research about Rare diseases treatments.

Statistics for Rare diseases

Rare diseases Message Boards

Related forums and medical stories:

User Interactive Forums

Read about other experiences, ask a question about Rare diseases, or answer someone else's question, on our message boards:


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