Churg-Strauss syndrome is rare, affecting as few as 1 to 3 people per million.

Possible risk factors for Churg-Strauss syndrome include:

  • Age. On average, people with Churg-Strauss syndrome are diagnosed in their mid- to late 40s.
  • History of asthma or nasal problems. Most people diagnosed with Churg-Strauss syndrome have a history of nasal allergies, chronic sinusitis or asthma, which is often severe or hard to control. It's important to note that while almost everyone with Churg-Strauss syndrome has asthma or allergies, most people with those conditions will never develop Churg-Strauss syndrome.
Jul. 12, 2013