This NHS content is written for people in England. Services, entitlements and contact routes may differ in other countries.
How you get actinomycosis
The bacteria that cause actinomycosis normally live harmlessly in the body. They only cause an infection if they get into the lining of areas such as the mouth or gut.
You cannot spread the infection to other people.
Any part of the body can be infected, but the head and neck, chest, tummy and pelvis are most commonly affected.
Possible causes of actinomycosis include:
- tooth decay and mouth infections
- mouth injuries
- inhaling food or liquid
- intrauterine devices (IUDs)
- dental or tummy surgery
- radiotherapy
You're more likely to get actinomycosis if you have type 2 diabetes or a weakened immune system.
Symptoms of actinomycosis
Symptoms of actinomycosis depend on what part of the body is affected.
See a GP if:
- you have symptoms of actinomycosis
Treatment for actinomycosis
Actinomycosis is treated with antibiotics. Treatment starts off in hospital with antibiotics given directly into a vein (intravenously).
When you're well enough to go home, you'll be given antibiotic tablets to take for a few months.
It's important to keep taking antibiotics until they're finished, even when you feel better.
You might also need surgery to drain areas of pus (abscesses) and remove the surrounding area of skin if it's infected.
How to prevent actinomycosis
Actinomycosis is very rare, so the chances of getting it are extremely small.
You can help reduce your risk by looking after your teeth and gums.
Actinomycosis
Actinomycosis
Actinomycosis
Causes of actinomycosis can include tooth decay, mouth injuries, inhaling food or liquid, dental or tummy surgery, and radiotherapy.
Symptoms of actinomycosis depend on what part of the body is affected, but may include lumps on the skin, swelling, and pus leaking from your skin.
Actinomycosis is treated with antibiotics. You'll usually need to be treated in hospital.
Content supplied by the NHS website, refreshed 19 August 2026. View the original NHS article ↗
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