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Cartersville Medical Center



Actinomycosis is a bacterial infection that results in collections of pus in the body.

Abdominal Abscess
Abdominal Abscess
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Actinomycosis is most often caused by infection by specific bacteria. This is normally present in the mouth and, sometimes, in the intestines. The jaw is most commonly involved, with lung and abdominal infections being less common. Rarely, women may develop abscesses in the reproductive organs or bladder.

Risk Factors

Factors that may increase your risk of actinomycosis include:

  • Having a dental disease or recent dental surgery
  • Liquids or solids that are sucked into the lungs
  • Having bowel surgery
  • Swallowing fragments of chicken or other bones
  • Having an intrauterine contraceptive device (IUD) in place for many years
  • Diabetes
  • Having a weakened immune system
  • Malnutrition
  • Tissue damage
  • Chronic granulomatous disease or other disorder that affects the immune system (children)


Actinomycosis may cause:

  • Hard swellings that are usually painless and located around the mouth, neck, or jaw
  • Swellings that may produce pus containing tiny, yellowish particles
  • Drainage of pus through the skin of the chest or abdomen
  • Fever
  • Weight loss
  • Cough that produces sputum or blood
  • Noticeable swelling or firm mass in the abdomen, especially the lower part


You will be asked about your symptoms and medical history. A physical exam will be done. Tests may include:

  • Analyses of pus, sputum, or tissue
  • X-ray


Talk with your doctor about the best treatment plan for you. Actinomycosis is treated with long-term antibiotics and by draining pus-containing abscesses.


The best way to reduce your chances of developing actinomycosis is to prevent dental disease by practicing good dental hygiene and regularly visiting your dentist. You should:

  • Brush your teeth twice a day
  • Floss daily
  • Replace your toothbrush regularly

Revision Information

  • Family Doctor—American Academy of Family Physicians

  • Mouth Healthy—American Dental Association

  • Canadian Dental Association

  • Health Canada

  • Actinomycosis. DynaMed website. Available at: Updated October 20, 2011. Accessed June 10, 2015.

  • Hall V. Actinomyces—gathering evidence of human colonization and infection. Anaerobe. 2008;14(1):1-7.

  • Naik NH, Russo TA. Bisphosphonate-related osteonecrosis of the jaw: the role of actinomyces. Clin Infect Dis. 2009;49(11):1729-1732.

  • Sullivan DC, Chapman SW. Bacteria that masquerade as fungi: actinomycosis/nocardia. Proc Am Thorac Soc. 2010;7(3):216-221.

The health information in this Health Library is provided by a third party. Cartersville Medical Center does not in any way create the content of this information. It is provided solely for informational purposes. It does not constitute medical advice and is not intended to be a substitute for proper medical care provided by a physician. Always consult with your doctor for appropriate examinations, treatment, testing, and care recommendations. Do not rely on information on this site as a tool for self-diagnosis. If you have a medical emergency, call 911.