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PubMed This is a summary of 19 peer-reviewed journal articles Updated
Oncology

Symptoms & Warning Signs

At a Glance

Acute Myeloid Leukemia (AML) symptoms happen quickly when cancer cells crowd out healthy blood cells in the bone marrow. Early warning signs include severe fatigue from anemia, easy bruising from low platelets, and a high risk of life-threatening infections. A fever requires immediate emergency care.

When you have Acute Myeloid Leukemia (AML), your body’s “blood factory”—the bone marrow—stops working correctly. Instead of making healthy blood cells, it begins churning out immature, dysfunctional cells called blasts [1]. This process is so rapid that it often feels like your symptoms appeared out of nowhere. Understanding why these symptoms happen can help you navigate the diagnostic process and communicate more clearly with your care team.

The Impact of Bone Marrow Failure

Most AML symptoms are caused by pancytopenia, a medical term for a shortage of all three major types of blood cells [2][3]. Because the leukemic blasts crowd out the healthy cells in your marrow, your blood counts drop, leading to the following:

  • Fatigue and Weakness (Anemia): When you lack healthy red blood cells, your body cannot transport oxygen efficiently. This leads to profound, persistent exhaustion, shortness of breath, and sometimes a pale complexion [4][5].
  • Frequent or Severe Infections (Neutropenia): White blood cells (neutrophils) are your primary defense against germs. Without enough of them, even a minor scratch or a common cold can quickly turn into a life-threatening infection. CRITICAL SAFETY WARNING: Because your white blood cells are compromised, a fever of 100.4°F (38°C) or higher is considered a neutropenic fever. This is a life-threatening medical emergency. Do not simply rest or take Tylenol; you must go to the emergency room immediately [6].
  • Easy Bruising and Bleeding (Thrombocytopenia): Platelets are the cells responsible for clotting. When they are low, you may notice petechiae (tiny red or purple spots that look like a rash but don’t fade when pressed), frequent nosebleeds, or gums that bleed when you brush your teeth [7][8].

Symptoms Outside the Bone Marrow

Sometimes, leukemic cells travel and grow in areas outside the bone marrow. This is called extramedullary disease [9]. These manifestations can be the first sign of leukemia or may appear later:

  • Myeloid Sarcoma (Chloroma): This is a solid tumor made of leukemic cells that forms in soft tissues like the skin, lymph nodes, or even the organs [10]. These often look like firm, painless lumps or masses [9].
  • Gingival Hyperplasia (Swollen Gums): Certain types of AML, particularly the monocytic subtypes, are known for causing the gums to become swollen, painful, and prone to bleeding [11][12]. This happens because leukemic cells actually infiltrate the gum tissue [12].
  • Leukemia Cutis: This is a skin involvement where leukemic cells create reddish or purple plaques, nodules, or rashes on the skin [13][14].

Why Accurate Diagnosis is Vital

Because the symptoms of AML—such as fever, fatigue, and body aches—are so general, they are frequently mistaken for more common, benign conditions. It is not unusual for a patient to initially be treated for a persistent flu or a stubborn infection before the underlying blood disorder is discovered [15][16].

Common “mimics” of AML include:

  • Severe Vitamin B12 Deficiency: Extreme lack of B12 can cause the bone marrow to look abnormal and lead to very low blood counts, mimicking the appearance of leukemia under a microscope [17][18].
  • Infections: Severe viral infections such as Cytomegalovirus (CMV), HIV, or Parvovirus B19 can cause severe bone marrow suppression, low blood counts, and atypical cells to appear in the blood [15].

Because of these similarities, doctors must use specific tests—such as a bone marrow biopsy and flow cytometry—to confirm that the symptoms are caused by malignant (cancerous) cells rather than a reversible deficiency or infection [19][18]. Identifying the exact cause is the only way to ensure you receive the correct, life-saving treatment.

Common questions in this guide

Why does acute myeloid leukemia cause so much fatigue?
AML crowds out healthy red blood cells in your bone marrow, leading to anemia. Without enough red blood cells, your body cannot efficiently transport oxygen, which causes profound and persistent exhaustion or shortness of breath.
What should I do if I have AML and get a fever?
A fever of 100.4°F (38°C) or higher is a life-threatening medical emergency called neutropenic fever. Because your white blood cells are compromised, you must go to the emergency room immediately rather than just resting or taking over-the-counter medication.
Can leukemia cause swollen or bleeding gums?
Yes, certain types of AML can cause leukemic cells to directly infiltrate the gum tissue. This condition makes the gums swollen, painful, and highly prone to bleeding, and may be one of the early signs of the disease.
Are there other conditions that mimic AML symptoms?
Yes, severe vitamin B12 deficiency and viral infections like CMV or parvovirus can cause similar low blood counts and mimic leukemia. Doctors use a bone marrow biopsy and other specialized tests to confirm whether your symptoms are caused by cancer or a reversible condition.
What does extramedullary disease mean in AML?
Extramedullary disease happens when leukemic cells travel and grow outside the bone marrow. This can appear as solid lumps under the skin called myeloid sarcomas, swollen gums, or skin rashes known as leukemia cutis.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Which of my symptoms are directly caused by low blood counts versus the leukemia itself?
  2. 2.Is my gum swelling or skin rash a sign of 'extramedullary disease,' and what does that mean for my prognosis?
  3. 3.Was a severe viral infection or Vitamin B12 deficiency ruled out before my AML diagnosis?
  4. 4.What is my current 'ANC' (absolute neutrophil count), and what specific precautions should I take to avoid infection?
  5. 5.If I develop a new soft tissue mass (myeloid sarcoma), how will that change my treatment plan?

Questions For You

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References

References (19)
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    The Journal of experimental medicine 2020; (217(2)) doi:10.1084/jem.20190589.

    PMID: 31873722
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    Consensus in acute myeloid leukemia in Mexico.

    Arana-Luna LL, Alvarado-Ibarra M, Silva-Michel LG, et al.

    Gaceta medica de Mexico 2022; (158(M3)):M1-M48 doi:10.24875/GMM.M21000598.

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    FLT3-ITD Mutation and Allogeneic Stem Cell Transplantation in Acute Myeloid Leukemia: A Case Study.

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    Understanding of the crosstalk between normal residual hematopoietic stem cells and the leukemic niche in acute myeloid leukemia.

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    A Patient Presenting for Dental Extraction After Completion of Chemotherapy.

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    Investigation of Biomarkers Associated with Low Platelet Counts in Normal Karyotype Acute Myeloid Leukemia.

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    International journal of molecular sciences 2022; (23(14)) doi:10.3390/ijms23147772.

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    Myeloid Sarcoma: Case Series with Unusual Locations.

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    Paraplegia as a Rare Clinical Presentation of Relapsed Acute Myeloid Leukemia.

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    Gingival hyperplasia as an early manifestation of acute myeloid leukemia. A retrospective review.

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    Oral manifestations of systemic leukemia-first sign of presentation.

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    Leukemia Cutis-The Current View on Pathogenesis, Diagnosis, and Treatment.

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    Aleukemic Myeloid Leukemia Cutis with a Kikuchi Disease-Like Inflammatory Pattern in Myelodysplastic Syndrome.

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    Vitamin B12 deficiency mimicking acute leukemia.

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    Acute Myeloid Leukaemia Presenting as B12 Vitamin Deficiency When Multiple Horses Become a Zebra.

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This page describes common symptoms and warning signs of Acute Myeloid Leukemia for educational purposes only. If you are experiencing a fever or severe symptoms, seek emergency medical care immediately.

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