Pericarditis is irritation and swelling of the pericardium, which is the thin sac that surrounds the heart. Extra fluid that builds up between the two layers of the pericardium restricts the heart’s action.

Pericarditis
pericarditis
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The cause of pericarditis is often unknown. However, possible causes include:

  • Viral, bacterial, or fungal infection
  • Heart attack
  • Inflammatory diseases such as rheumatoid arthritis or lupus
  • Cancer that has spread from a tumor near the heart
  • Kidney failure
  • Injury or surgery affecting the chest, esophagus, or heart
  • Radiation treatment
  • Certain medications used to suppress the immune system