Factors that may increase the risk of developing Henoch-Schonlein purpura include:

  • Age. The disease affects primarily children and young adults with the majority of cases occurring in children between 2 and 6 years of age.
  • Sex. Henoch-Schonlein purpura is slightly more common in boys than girls.
  • Race. White and Asian children are more likely to develop Henoch-Schonlein purpura than black children are.
  • Time of year. Henoch-Schonlein purpura strikes mainly in autumn, winter and spring but rarely in summer.
Jul. 31, 2013