It's not clear what causes the inflammation of the colon found in microscopic colitis. Researchers believe that the causes may include:

  • Medications that can irritate the lining of the colon
  • Bacteria that produce toxins that irritate the lining of the colon
  • Viruses that trigger inflammation
  • Immune system problems, such as rheumatoid arthritis or celiac disease, that occur when your body's immune system attacks healthy tissues
Jan. 30, 2013