Some individuals experience repeated respiratory infections, persistent sore throats, skin infections, or unexplained fevers.
A fever may occur because the body is responding to an infection or another inflammatory process.
In people with leukemia, infections can sometimes become serious more quickly than expected, particularly when the number of functioning neutrophils is low.
Neutrophils are white blood cells that play an important role in fighting bacterial and fungal infections.
A condition called neutropenia occurs when neutrophil levels fall below normal.
People with significant neutropenia may be at increased risk of dangerous infections.
Warning signs can include:
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Fever or chills.
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Persistent coughing.
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Painful swallowing.
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Skin redness or swelling.
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Unexplained abdominal discomfort.
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Burning or pain during urination.
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Worsening weakness during an infection.
Patients already undergoing cancer treatment should follow their medical team's specific fever instructions. A fever during chemotherapy or severe neutropenia can represent a medical emergency.
For someone who has not been diagnosed, repeated or persistent infections should be discussed with a healthcare professional.
A fever that repeatedly returns without a clear explanation is a reason to seek medical advice, particularly when accompanied by other unusual symptoms.
7. Night Sweats and Unexplained Weight Loss
Another symptom associated with some forms of leukemia is excessive sweating during the night.
There is an important difference between ordinary sweating caused by warm weather or heavy bedding and night sweats that repeatedly soak clothing or bedsheets despite a comfortable sleeping environment.
Night sweats can occur for many reasons, including infections, hormonal changes, medication effects, and other medical conditions.
In some patients with leukemia, they may occur alongside unexplained weight loss and fever.
These symptoms are sometimes described as constitutional symptoms or, in particular contexts, B symptoms.
Unintentional weight loss deserves attention when someone loses a noticeable amount of body weight without deliberately changing their diet or increasing physical activity.
The reasons may include changes in metabolism, inflammation, reduced appetite, or the effects of the underlying disease.
A person may also notice that food no longer tastes appealing or that they become full more quickly than usual.
These changes are not specific to leukemia.
Thyroid disorders, digestive diseases, chronic infections, diabetes, and other medical conditions can produce similar symptoms.
However, unexplained weight loss combined with persistent fever, night sweats, enlarged lymph nodes, or severe fatigue warrants medical assessment.
8. Enlarged Lymph Nodes: Small Changes That May Be Easy to Miss
Lymph nodes are small structures distributed throughout the body.
They are part of the lymphatic and immune systems and help filter substances while supporting immune responses.
They can become enlarged when the body is fighting an infection.
For example, lymph nodes in the neck may swell during a throat infection. Nodes near the jaw may become noticeable when someone has a dental problem.
In many cases, they return to normal after the underlying infection resolves.
However, persistent or unexplained lymph node enlargement may require further investigation.
Some leukemia types, particularly certain lymphoid leukemias, can involve lymphatic tissue.
A person may notice lumps in the:
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Neck.
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Armpits.
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Groin.
These lumps may be painless.
Their presence does not automatically indicate cancer. Many infections and noncancerous conditions can also cause enlarged lymph nodes.
Nevertheless, a lump that continues growing, remains enlarged without an obvious explanation, or appears alongside unexplained weight loss, fever, or night sweats should be assessed by a medical professional.
9. Bone Pain and Joint Discomfort
Bone marrow is located inside bones, which helps explain why some leukemia patients experience bone or joint discomfort.
Abnormal cell accumulation and changes within the marrow can contribute to pain.
Children with acute leukemia may sometimes complain of persistent leg pain or joint discomfort. Adults can also experience similar symptoms.
The pain may be described as aching, pressure, tenderness, or discomfort that becomes more noticeable at night.
Some people experience pain in the back, ribs, hips, or long bones of the legs.
However, most bone and joint pain is caused by more common conditions, such as physical strain, arthritis, injuries, or infections.
Pain should be interpreted in the context of other symptoms and clinical findings.
Persistent unexplained bone pain, especially when accompanied by fatigue, fever, bruising, or abnormal blood counts, deserves investigation.
10. What Happens During the First Medical Examination?
For someone experiencing several concerning symptoms, the first step is usually a medical consultation.
The doctor will ask about the symptoms, when they began, how frequently they occur, and whether they are getting worse.
They may also ask about:
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Previous medical conditions.
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Current medications and supplements.
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Recent infections.
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Family medical history.
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Unexplained bleeding or bruising.
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Changes in body weight.
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Recent travel or possible exposure to infections.
A physical examination may include checking the skin, examining the mouth and gums, feeling lymph nodes, and assessing the abdomen for enlargement of the liver or spleen.
The doctor may then recommend blood tests.
One of the most important initial investigations is the complete blood count, often abbreviated as CBC.
This test measures different components of the blood, including red blood cells, white blood cells, hemoglobin, and platelets.
An abnormal CBC does not establish leukemia.
However, certain patterns can lead doctors to investigate further.
For example, a patient may have anemia, low platelet levels, and an abnormal white blood cell count.
In some cases, immature blood cells called blasts may be detected in the bloodstream.
These findings can raise suspicion of a bone marrow disorder.
A peripheral blood smear may then be examined under a microscope to assess the appearance of the blood cells.
The next steps depend on the results.
11. The Tests Doctors Use to Diagnose Leukemia
Accurately diagnosing leukemia requires more than recognizing symptoms.
Specialists use a combination of laboratory investigations, bone marrow testing, and genetic or molecular analysis.
Each test provides different information.
Complete blood count
A CBC provides measurements of the major blood cell types.
It can identify anemia, abnormal platelet levels, and changes in white blood cell counts.
However, some patients with leukemia may have relatively normal-looking blood counts early in the disease.
Therefore, a normal CBC should be interpreted in the context of symptoms and clinical findings.
Peripheral blood smear
A blood smear allows laboratory specialists to examine individual blood cells.
They can look for abnormal shapes, immature cells, and other changes that may suggest a blood disorder.
Bone marrow aspiration
Bone marrow aspiration involves collecting a small sample of liquid marrow, usually from the back of the hip bone.
The sample is examined to identify abnormal cells and determine how blood cell production is functioning.
Bone marrow biopsy
A biopsy collects a small core of bone marrow tissue.
It provides information about the structure and cellular composition of the marrow.
Aspiration and biopsy are frequently performed together.
Flow cytometry
Flow cytometry identifies specific proteins on the surface or inside cells.
These markers help specialists determine whether abnormal cells belong to a particular blood cell lineage.
This information is essential for classifying leukemia.
Cytogenetic testing
Cytogenetic testing examines chromosomes inside the abnormal cells.
Certain chromosome changes are associated with particular leukemia subtypes.
Molecular testing
Molecular investigations look for specific genetic changes that can influence diagnosis, prognosis, and treatment decisions.
For example, certain genetic abnormalities can help doctors select targeted medications.
Together, these tests allow specialists to develop a more precise understanding of the disease.
The exact leukemia subtype matters because treatment decisions depend heavily on the biological characteristics of the abnormal cells.
12. The Emotional Shock of Hearing the Word "Cancer"
A cancer diagnosis is not merely a medical event. It can become one of the most emotionally challenging experiences a person and their family will ever face.
For a 23-year-old, the emotional impact may be particularly overwhelming.
At that age, many people are only beginning to establish independence. They may be finishing university, starting their first serious job, planning a wedding, saving money, or imagining what their lives will look like in five or ten years.
Suddenly, those plans may seem uncertain.
The first reaction can be disbelief.
Some patients struggle to understand how something so serious could happen when they previously considered themselves healthy.
Others immediately think about their parents, siblings, partners, and friends.
Questions begin appearing faster than anyone can answer them.
Will I survive?
Will I need chemotherapy?
Will I lose my hair?
Will I be able to return to work?
Can I have children in the future?
How much will treatment cost?
Will my family be able to cope?
These questions are understandable. They reflect the fear of facing something unfamiliar and potentially life-changing.
Some people cry immediately. Others become unusually quiet. Some begin researching every possible outcome online, while others avoid discussing the diagnosis because they cannot yet process what has happened.
There is no single correct emotional response.
A patient does not have to remain strong every moment of the day. Feeling frightened, angry, confused, or overwhelmed does not mean that person is giving up.
Medical teams understand that cancer treatment involves more than controlling abnormal cells. Emotional support is also an important part of comprehensive cancer care.
Psychologists, counselors, social workers, patient navigators, and support groups can help patients and families navigate the psychological and practical challenges of treatment.
For young adults, age-specific support programs may also address education, employment, relationships, fertility, and the transition into independent adulthood.
13. Understanding the Different Types of Leukemia
One of the most important facts about leukemia is that the disease includes several distinct categories.
Doctors generally classify leukemia according to two characteristics:
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How quickly the disease develops.
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Which type of blood-forming cell becomes abnormal.
The first distinction separates acute and chronic leukemia.
The second distinguishes lymphoid and myeloid leukemia.
These classifications create four major categories.
Acute lymphoblastic leukemia (ALL)
ALL develops when immature lymphoid cells become abnormal and multiply.
It is particularly common in children, but it can also occur in teenagers and adults.
The disease may progress quickly, making prompt diagnosis and treatment important.
Symptoms can include fatigue, fever, bruising, bleeding, bone pain, swollen lymph nodes, and recurrent infections.