Acute myeloid leukemia (AML) does not usually have one single clear cause; instead, it develops after DNA damage in bone marrow cells, influenced by a mix of genetic changes and environmental or medical risk factors. In many people with AML, no specific trigger is ever found.

What AML is (in brief)

AML is a cancer of the bone marrow in which immature myeloid cells (early white blood cells) grow out of control and crowd out normal blood cell production. These cells carry genetic mutations that drive abnormal growth and prevent normal maturation into healthy blood cells.

Direct ā€œcauseā€ vs risk factors

  • The immediate cause of AML is mutations in the DNA of stem cells in the bone marrow, which make cells divide too quickly and avoid normal death signals.
  • Risk factors are things that make these mutations more likely, but they still do not guarantee that AML will develop.

Main known risk factors

  • Age and sex : AML is more common in older adults and slightly more common in males.
  • Previous blood disorders : Conditions like myelodysplastic syndromes, myelofibrosis, polycythaemia vera, or some other chronic blood diseases can evolve into AML.
  • Previous cancer treatment : Some chemotherapy drugs and radiotherapy used for other cancers can damage bone marrow DNA and increase AML risk years later.
  • Radiation exposure : Highā€‘dose radiation (for example, some medical treatments or major accidents) is linked to increased AML risk.
  • Chemical exposure (especially benzene) : Longā€‘term exposure to benzene, found in some industrial settings and in petrol and cigarette smoke, clearly raises AML risk.
  • Smoking : Cigarette smoke contains benzene and other carcinogens, and smokers have a higher risk of AML than nonā€‘smokers.

Genetic and inherited factors

  • Acquired gene mutations : Many AML cases have mutations in genes such as FLT3, NPM1 and others that control cell growth and survival; these mutations are usually acquired during life, not inherited.
  • Inherited syndromes : A small proportion of people inherit conditions (for example, Down syndrome, Fanconi anaemia and some familial bone marrow failure or leukemia syndromes) that significantly increase their lifetime risk of AML.
  • Family history : Having a close relative with AML slightly increases risk, but most AML occurs sporadically with no family history.

When there is ā€œno obvious causeā€

  • Large national health sources emphasise that in most people with AML, no single cause or exposure can be identified.
  • This means someone can live a completely ordinary life, with no major chemical or radiation exposure, and still develop AML purely because of spontaneous DNA damage over time.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.