The types of pelvic inflammatory disease (PID) are defined by the part of the reproductive tract that becomes inflamed due to infection. These include:

• Salpingitis. Occurs in the fallopian tubes and is the most common form of the disease.
  
  
• Myometritis. Occurs in the uterine wall.
  
  
• Endometritis. Occurs in the endometrium (uterine lining). This should not be confused with endometriosis, an unrelated condition of the uterine lining.
  
  
• Parametritis. Occurs in the uterine serosa (the outer layer of the uterine wall) and the broad ligaments that give support to the uterus and pelvis.
  
  
• Oophoritis. Occurs in one or both ovaries.