Leukaemia and Leukemia: Meaning, Types, Symptoms and Treatment
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Leukemia Meaning and Definition: What is Leukaemia?
Leukemia (also spelt leukaemia) is a type of cancer that originates in the bone marrow, where blood cells are produced. In leukemia, the bone marrow begins producing abnormal white blood cells that do not function properly, multiply uncontrollably, and gradually crowd out normal healthy blood cells. This reduces the body’s ability to fight infections, transport oxygen, and control bleeding.
The word ‘leukaemia’ comes from Greek: leukos (white) and haima (blood). It is also sometimes called blood cancer, white blood cell cancer, or a haematological malignancy. The four main types of leukemia – AML, CML, ALL, and CLL – are described below.
Leukemia meaning: Leukemia is a type of cancer that affects the blood and bone marrow – the soft, spongy tissue inside bones where blood cells are produced.
Leukemia definition: In simple terms, leukemia is a cancer of the body’s blood-forming tissues, including the bone marrow and lymphatic system. It happens when the body starts producing abnormal white blood cells that do not function properly and begin to crowd out normal blood cells.
What is leukemia disease? It is a condition where abnormal blood cells multiply rapidly and interfere with the body’s ability to fight infections, carry oxygen, and control bleeding.
Leukemia Types – Understanding the Four Main Categories
Leukemia types are classified based on how fast the disease progresses (acute or chronic) and the type of blood cell affected (lymphoid or myeloid)
Type | Description |
Acute Lymphoblastic Leukemia (ALL) | Fast-growing; common in children |
Acute Myeloid Leukemia (AML) | Fast-growing; more common in adults |
Chronic Lymphocytic Leukemia (CLL) | Slow-growing; often in older adults |
Chronic Myeloid Leukemia (CML) | Slow-growing; linked to Philadelphia chromosome |
Read Also : Types of Blood Cancer: A Complete Guide to Different Blood Cancers
Leukemia Symptoms – Early Warning Signs to Watch For
- Leukemia symptoms may vary by type but often include:
- Persistent fever or night sweats
- Fatigue and weakness
- Unexplained weight loss
- Frequent infections
- Bleeding or bruising easily (nosebleeds, bleeding gums)
- Pale skin or anemia
- Bone or joint pain
- Swollen lymph nodes (neck, armpits, groin)
- Enlarged spleen or liver
- Tiny red spots under the skin (petechiae)
Note: Early symptoms can resemble the flu. Persistent or unusual symptoms should be investigated.
Leukemia Symptoms in Children and Toddlers
Acute lymphoblastic leukaemia (ALL) is the most common cancer in children, accounting for approximately 25 to 30 per cent of childhood cancer diagnoses. Recognising early signs in children and toddlers is important because childhood leukaemia tends to develop quickly.
Common signs of leukaemia in children and toddlers include:
- Persistent or unexplained fatigue and pallor (pale skin) that does not improve with rest.
- Unusual or frequent bruising for a child’s age and activity level.
- Recurrent or prolonged infections that take longer than usual to clear.
- Unexplained fever lasting more than a few days without a clear infection.
- Bone or joint pain that is difficult to attribute to typical childhood activity – the child may refuse to walk or limp.
- Swollen lymph nodes in the neck, armpit, or groin.
- A visibly enlarged abdomen (due to enlarged liver or spleen).
- Loss of appetite or unexplained weight loss.
If you notice any combination of these signs in a child, particularly pallor, unusual bruising, and fatigue together, consult a paediatrician or paediatric haematologist promptly. Childhood leukaemia is associated with significantly better outcomes when detected and treated early.
Leukemia Causes and Risk Factors
Leukemia causes are not always clear, but known risk factors include:
- Genetic mutations or chromosomal changes (e.g., Philadelphia chromosome in CML)
- Exposure to high radiation levels
- Certain chemicals (e.g., benzene in industrial solvents or tobacco smoke)
- Previous chemotherapy for other cancers
- Genetic disorders (e.g., Down syndrome)
- Smoking
- Family history of leukemia disease
- Weakened immune system
Read Also : Blood Cancer Causes, Reasons, and Risk Factors: A Complete Guide
Stages of Leukaemia and Leukemia
Acute Myeloid Leukaemia (AML): AML does not use a numerical staging system. It is classified by genetic subtype (cytogenetics and molecular markers) using the WHO and ELN (European LeukemiaNet) classification systems, which categorise patients into favourable, intermediate, or adverse risk groups.
Acute Lymphoblastic Leukaemia (ALL): ALL in adults uses risk stratification rather than traditional staging. Factors include white blood cell count at diagnosis, specific chromosomal changes (e.g., Philadelphia chromosome), and age.
Chronic Lymphocytic Leukaemia (CLL): CLL uses the Rai Staging System (Stage 0 to Stage IV) and the Binet Classification. Stage 0 involves only elevated lymphocyte count; Stage IV includes low platelets (thrombocytopenia).
Chronic Myeloid Leukaemia (CML): CML is classified into three phases: Chronic Phase (controlled, most common at diagnosis), Accelerated Phase (disease is progressing), and Blast Crisis (rapid, aggressive progression resembling acute leukaemia).
Leukemia Diagnosis – How It Is Detected
Leukemia diagnosis involves several tests to confirm the presence and type of disease:
Test | Purpose |
Complete Blood Count (CBC) | Checks levels of white cells, red cells, and platelets |
Peripheral smear | Observes abnormal cells under a microscope |
Bone marrow aspiration & biopsy | Samples taken from hip bone to check for leukemia cells |
Cytogenetic testing | Identifies chromosome abnormalities |
Flow cytometry | Determines type and aggressiveness of leukemia |
Imaging (X-ray, ultrasound, CT) | Checks organ involvement |
Leukemia Treatment Options at Onco-Life Cancer Centre
Leukemia treatment and leukemia treatments are personalized based on type, age, and patient condition. Our expert hemato-oncologists offer:
Treatment | Details |
Main treatment for most types; given in cycles (oral or IV) | |
Drugs blocking specific mutations (e.g., Imatinib for CML) | |
Immunotherapy & monoclonal antibodies | Helps immune system destroy cancer cells |
Bone marrow / stem cell transplant | Replaces diseased marrow with healthy donor cells |
Rare; used for localized disease or before transplant | |
Supportive care | Blood transfusions, antibiotics, growth factors, nutrition support |
Leukaemia and Leukemia Treatment at Onco-Life Cancer Centre, Maharashtra
Onco-Life Cancer Centre offers Clinical Haematology and Medical Oncology services for leukaemia, lymphoma, and related blood cancers. Treatment planning follows National Cancer Grid (NCG) protocols aligned with Tata Memorial Centre guidelines.
Dr. Adwaita A. Gore (M.B.B.S., D.N.B. Medicine, D.N.B. Oncology, ESMO-Certified Haemato-Oncologist, Director and Partner, Oncology Care Associates LLP) leads haemato-oncology care at Onco-Life’s Chiplun centre. Consultations are also available at Talegaon, Wagholi (Pune), and Satara.
Treatment options available at Onco-Life for leukaemia include: induction and consolidation chemotherapy; targeted therapy (including tyrosine kinase inhibitors for CML); immunotherapy; supportive care (transfusion, infection management); clinical trials for eligible patients; and coordination with transplant programmes for bone marrow transplant candidate
Leukaemia Treatment Under MJPJAY and Government Health Schemes
Onco-Life Cancer Centre is empanelled with MJPJAY (Mahatma Jyotirao Phule Jan Arogya Yojana) for eligible Maharashtra residents, Ayushman Bharat (PM-JAY), and CGHS. Leukaemia chemotherapy and related treatment packages may be covered for eligible patients. Eligibility criteria apply.
DISCLAIMER
This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions regarding a medical condition.
Medically reviewed by Dr. Jyoti Mehta, M.D. (Physician), M.D. (Radiation Oncology), FICO, Consultant, Clinical and Radiation Oncologist, Onco-Life Cancer Centre. Last reviewed: May 2026.
Most Popular Questions
Leukaemia and Leukemia: Meaning, Types, Symptoms and Treatment
What Are The Symptoms Of Leukemia?
Common leukemia symptoms include: unusual fatigue and pallor; unexplained fever; frequent infections; easy or unusual bruising; tiny red dots under the skin (petechiae); swollen lymph nodes in the neck, armpits, or groin; bone or joint pain; enlarged abdomen (due to spleen or liver); and unintentional weight loss. Symptoms may differ between acute and chronic types.
What Are The Signs Of Leukemia In Children And Toddlers?
Signs of leukemia in toddlers and children include: persistent pallor (pale skin), unusual bruising, recurrent infections, unexplained fever, bone or joint pain that causes limping or refusal to walk, swollen lymph nodes, and enlarged abdomen. ANY combination of these signs in a child - particularly pallor, bruising, and persistent fatigue - warrants prompt medical evaluation.
Does Leukemia Have Stages?
Unlike solid tumours, leukemia is not staged using Stage 1 to 4. Instead, leukemia is classified by type and risk category. CLL uses the Rai Staging System (Stages 0 to IV). CML is classified as Chronic Phase, Accelerated Phase, or Blast Crisis. AML and ALL use risk stratification based on genetic and molecular markers.
What Is The Treatment For Leukemia?
Treatment depends on the type and stage of leukemia and the patient's age and health. Common treatments include: chemotherapy (the most common treatment for most leukemia types); targeted therapy (e.g., imatinib for CML); immunotherapy and monoclonal antibodies; and bone marrow (stem cell) transplant for eligible patients. Treatment is typically planned and managed by a multidisciplinary team.
Is Leukemia Treatment Available Under MJPJAY At Onco-Life?
Onco-Life Cancer Centre is empanelled with MJPJAY, Ayushman Bharat (PM-JAY), and CGHS. Leukaemia treatment packages, including chemotherapy, may be covered for eligible patients. Eligibility criteria apply. Contact the Onco-Life patient services desk to confirm your coverage before visiting.
