Diagnosis and tests

Symptoms of AML

The related article (“AML: symptoms and diagnosis”) explains platelets. This topic looks closely at the symptoms of acute myeloid leukaemia (AML): why they happen and which ones are urgent.

Last updated: 14 October 2026~1 min read

Three icons in a row. — **Figure 1.**Anaemia, bleeding, infection.

01Short answer

Most AML symptoms come from a fall in normal blood cells in the bone marrow. Too few red cells cause tiredness, paleness, breathlessness and a pounding heart; too few platelets cause easy bruising, nose and gum bleeds and tiny red spots on the skin (petechiae); too few working neutrophils cause repeated or severe infections and fever. Symptoms usually build up quickly over weeks. In some types of AML, leukaemia cells move into tissues, causing swollen gums or skin lumps. A very high white count can cause headache, vision problems or breathlessness (leukostasis), which is an emergency. These symptoms also occur in other illnesses; only tests can make the diagnosis.

02Simple explanation

Three shortages: anaemia, bleeding, infection.

Fast: over weeks.

Urgent: leukostasis, heavy bleeding.

03Scientific explanation

Extramedullary disease: gum infiltration and skin involvement are more common in monocytic types of AML.

Leukostasis: a very high blast count can block small vessels and affect the lungs and brain.

04What happens in the body?

Three shortages

Anaemia, low platelets and too few working neutrophils cause the main symptoms.

Gums

In some types of AML the gums can swell.

A quick start

Symptoms can build up over a few weeks.

A short calendar strip. — **Figure 3.**A quick start over weeks.

05How symptoms arise

Four steps.

1MarrowBlasts multiply.

2ShortageNormal cells fall.

3SymptomsTiredness, bleeding, infections.

4Seeking helpA blood test.

06Symptom and cause

Symptom	Cause
Tiredness, paleness, breathlessness	Too few red cells
Bruises, bleeding, petechiae	Too few platelets
Fever, infections	Too few working neutrophils
Swollen gums	Tissue infiltration
Headache, vision problems	Leukostasis (urgent)

07Key terms

Petechiae: Tiny red spots on the skin.
Anaemia: Too few red cells and too little haemoglobin.
Leukostasis: Blocked vessels from a very high white count.
Infiltration: Leukaemia cells moving into tissues.
Cytopenia: A shortage of blood cells.

08Key points

AML symptoms come from cell shortages.
They can build up fast.
Watch for bruising and bleeding.
Repeated infections are a signal.
Some symptoms are urgent.
Only tests make the diagnosis.

09Frequently asked questions

If I have these symptoms, is it definitely AML?

No; they usually have other causes. A blood test will clarify.

Is there pain?

Sometimes there is bone or joint pain.

When do I need emergency help?

With heavy bleeding, confusion, severe breathlessness or a high fever.

10Questions for your doctor

Take these questions to your appointment. The ones you save are collected on the “My questions” page and stay on this device only.

If I have these symptoms, is it definitely AML?
Is there pain?
When do I need emergency help?

My questions

12Sources

National Cancer Institute (NCI). Adult AML treatment (PDQ), patient version
MedlinePlus. Blood smear
American Cancer Society. Infections in People with Cancer
American Cancer Society. Tests for CML
Testing.com. Blood Smear Test: What It Shows and What Results Mean
Cancer Research UK. Bone marrow test
Testing.com. Bone Marrow Aspiration and Biopsy: What to Know
Testing.com. Immunophenotyping by Flow Cytometry Explained
Leukemia, 2012. EuroFlow antibody panels for standardized n-dimensional flow cytometric immunophenotyping of normal, reactive and malignant leukocytes
Blood (American Society of Hematology), 2018. iwCLL guidelines for diagnosis, indications for treatment, response assessment, and supportive management of CLL

Medical disclaimerThis information is for educational purposes only and does not replace medical advice.

Last updated: 14 October 2026← Back to the list

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