Comprehensive Overview of Leukemia
Leukemia is a type of cancer that begins in the blood and bone marrow. Bone marrow is the soft tissue inside bones where blood cells are made.
Leukemia causes the body to produce large numbers of abnormal white blood cells. These abnormal cells crowd out healthy blood cells and interfere with normal body functions.
This guide explains what leukemia is, leukemia symptoms, types of leukemia, causes, and treatment.
This information is educational only and not medical advice.
What Is Leukemia
Leukemia begins when cells in the bone marrow develop DNA changes that allow them to grow uncontrollably and avoid normal cell death.
Instead of producing healthy blood cells, the bone marrow produces large numbers of abnormal white blood cells.
These leukemia cells:
- do not function normally
- crowd out healthy cells
- circulate in the bloodstream
This can lead to problems with:
- infection control
- oxygen transport
- blood clotting
Leukemia usually does not form solid tumors. Instead, cancer cells circulate through the blood and bone marrow.
How Leukemia Develops
Blood cells are normally produced in the bone marrow.
Healthy bone marrow produces:
- red blood cells
- white blood cells
- platelets
Leukemia disrupts this process.
Leukemia cells grow faster than normal cells and take over the bone marrow.
This leads to:
- low red blood cells (anemia)
- low platelets
- abnormal white blood cells
These changes cause many leukemia symptoms.
Types of Leukemia
Leukemia is divided into four main types.
Acute Lymphocytic Leukemia (ALL)
Acute lymphocytic leukemia develops quickly.
It affects immature white blood cells called lymphocytes.
ALL is more common in children but can occur in adults.
Acute Myeloid Leukemia (AML)
Acute myeloid leukemia develops rapidly.
It affects immature blood cells called myeloid cells.
AML is more common in adults.
Chronic Lymphocytic Leukemia (CLL)
Chronic lymphocytic leukemia develops slowly.
Some people have no symptoms for years.
CLL is more common in older adults.
Chronic Myeloid Leukemia (CML)
Chronic myeloid leukemia usually develops slowly at first.
It may later become more aggressive.
Leukemia Symptoms
Leukemia symptoms develop because abnormal blood cells replace healthy cells.
Early leukemia symptoms may be mild.
Common leukemia symptoms include:
- fatigue
- frequent infections
- fever
- easy bruising
- bleeding
- pale skin
- weight loss
Persistent symptoms should be medically evaluated.
Blood-Related Symptoms
Leukemia affects blood cell production.
Low Red Blood Cells
Symptoms include:
- fatigue
- weakness
- shortness of breath
- pale skin
Low Platelets
Symptoms include:
- easy bruising
- frequent nosebleeds
- bleeding gums
- slow clotting
Abnormal White Blood Cells
Symptoms include:
- frequent infections
- fevers
- slow recovery from illness
Bone Marrow Symptoms
Leukemia affects bone marrow inside bones.
Symptoms include:
- bone pain
- joint pain
- tenderness
Bone pain is common in leukemia.
Lymph Node Symptoms
Leukemia may affect lymph nodes.
Symptoms include:
- swollen lymph nodes
- neck swelling
- armpit swelling
Swollen lymph nodes are usually painless.
Symptoms of Advanced Leukemia
Advanced leukemia may affect other organs.
Symptoms include:
- enlarged spleen
- enlarged liver
- abdominal fullness
- severe fatigue
- weight loss
Causes and Risk Factors
Leukemia develops from genetic changes and environmental factors.
Risk factors include:
Radiation Exposure
High radiation exposure increases risk.
Chemical Exposure
Certain industrial chemicals increase risk.
Examples include:
- benzene
Smoking
Smoking increases leukemia risk.
Genetic Conditions
Some inherited conditions increase risk.
Previous Cancer Treatment
Chemotherapy and radiation may increase risk.
How Leukemia Is Diagnosed
Diagnosis may include:
- blood tests
- bone marrow tests
- genetic testing
- imaging tests
Blood tests often detect leukemia first.
Bone marrow testing confirms leukemia.
Leukemia Treatment
Treatment depends on leukemia type.
Chemotherapy
Chemotherapy is the main treatment.
It destroys leukemia cells.
Targeted Therapy
Targets specific leukemia mutations.
Immunotherapy
Helps immune cells attack leukemia.
Stem Cell Transplant
Replaces damaged bone marrow.
Leukemia Prevention
Most leukemia cannot be prevented.
Risk may be reduced by:
- avoiding smoking
- reducing chemical exposure
- limiting radiation exposure
When Symptoms Need Medical Evaluation
Medical evaluation is important if symptoms include:
- persistent fatigue
- frequent infections
- unexplained bruising
- bleeding
- fever without cause
Early diagnosis improves outcomes.
Medical References
National Cancer Institute
https://www.cancer.gov/types/leukemia
American Cancer Society
https://www.cancer.org/cancer/leukemia.html
Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/leukemia
