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About Rare Disease Day

About Rare Disease Day

Rare Disease Day is an international advocacy day to bring widespread recognition of rare diseases as a global health challenge. The day is celebrated on the last day of February every year. Learn more about the History of Rare Disease Day, Past Successes or the Goals and Plans for this year’s campaign.

Anyone can be involved in Rare Disease Day and there are many suggested activities. The day has been established as a grassroots advocacy day and we encourage everyone to participate in some way!

This website focuses on Rare Disease Day activities in the U.S. To learn what’s happening around the world, go to the global Rare Disease Day website at rarediseaseday.org.

What is a Rare Disease?

In the U.S., any disease affecting fewer than 200,000 people is considered rare. This definition comes from the Orphan Drug Act of 1983 and is slightly different from the definition used in Europe. There are nearly 7,000 rare diseases affecting nearly 30 million Americans. In other words, almost one in ten Americans are suffering from rare diseases.

Besides dealing with their specific medical problems, people with rare diseases struggle to get a proper diagnosis, find information, and get treatment. The rarity of their conditions makes medical research more difficult.