The short answer
Most ALL symptoms come from a shortage of healthy blood cells: fatigue, infections, and bruising. ALL can also cause bone pain, an enlarged spleen, and rarely, a chest mass that presses on a major vein, an emergency called SVC syndrome.
Most signs and symptoms of ALL come from a shortage of healthy blood cells, caused by leukemia cells crowding the bone marrow.
General symptoms include fever, night sweats, weight loss, bone or joint pain, and swollen lymph nodes.
ALL can involve organs beyond the blood and marrow, including the brain, spinal cord, chest, skin, and in men, the testicles.
Superior vena cava (SVC) syndrome, caused by a chest mass pressing on a major vein, is a rare but serious emergency that needs immediate treatment.
Choose how you want to understand this
The full explanation.
The simple version
Acute lymphoblastic leukemia (ALL) is a fast-growing cancer of the blood-forming cells in the bone marrow. Most of its symptoms come from a shortage of healthy blood cells, because leukemia cells crowd out normal blood cell production.
Most ALL symptoms happen because leukemia cells crowd out healthy blood cells in the bone marrow, not because of a tumor you can feel.
Symptoms from low blood counts
- Low red blood cells (anemia): fatigue, weakness, dizziness, lightheadedness, pale skin, shortness of breath
- Low healthy white blood cells: infections that keep recurring or won't clear, often with fever
- Low platelets: bruising, small red or purple spots on the skin, nosebleeds, bleeding gums, heavy periods
Other common symptoms
- Fever, night sweats, loss of appetite, and weight loss
- Abdominal swelling or fullness, from an enlarged liver or spleen
- Swollen lymph nodes in the neck, underarm, or groin
- Bone or joint pain, from leukemia cells building up near bone surfaces or inside joints
Less common: spread to other organs
Less often, ALL spreads beyond the blood and bone marrow to affect the brain, spinal cord, chest, skin, eyes, testicles, ovaries, or kidneys, causing symptoms specific to that location.
Get help right now if…
- Swelling of the face, neck, or arms, along with headaches, dizziness, or trouble breathing. This can be superior vena cava (SVC) syndrome, caused by an enlarged thymus or lymph node mass pressing on a major vein in the chest. It is life-threatening and needs immediate treatment.
- A fever during or after treatment, especially with a known low neutrophil count. See Neutropenic Fever During Cancer Treatment.
- Bleeding that won't stop, or sudden, heavy bruising.
- New headache, vomiting, trouble with balance, facial numbness, blurred vision, or seizures, which can signal spread to the brain or spinal cord.
- Sudden confusion or severe lightheadedness.
These symptoms need same-day attention, not a scheduled follow-up appointment. Use your care team's emergency plan, or go to an emergency department if you cannot reach them.
Why prompt evaluation matters
ALL grows quickly, so once it's suspected, it almost always needs prompt evaluation by a hematologist-oncologist, a doctor who specializes in blood cancers. This doesn't mean every decision happens instantly, but delays for non-medical reasons are worth avoiding.
Questions to ask
- What is my white blood cell count telling us about urgency?
- Is there any sign this has reached my brain, spinal cord, or another organ?
- Which symptoms mean I should seek emergency care?
- How soon does treatment need to start?
Sources
Words to know
Tap any term to see what it means.
Common questions
How quickly do ALL symptoms usually appear?
Often over days to a few weeks. Like AML, ALL is a fast-growing leukemia, so symptoms tend to build up more quickly than with chronic leukemias.
Why does ALL cause bone or joint pain?
Leukemia cells can build up near bone surfaces or inside joints, causing pain. This is more common in ALL than in some other leukemia types, particularly in children, and can sometimes be mistaken for a musculoskeletal problem before blood testing clarifies the cause.
What is superior vena cava (SVC) syndrome?
It's a medical emergency that can occur when an enlarged thymus (a gland in the chest) or lymph node mass presses on the superior vena cava, the large vein that carries blood from the head, neck, and arms back to the heart. It causes swelling of the face, neck, and arms, along with headaches, dizziness, and sometimes trouble breathing or altered consciousness, and needs immediate treatment.
Can ALL affect organs besides blood and bone marrow?
Yes, though less often. ALL can spread to the brain and spinal cord, chest, skin, eyes, testicles, ovaries, or kidneys, causing symptoms specific to that location.
Is ALL only a childhood cancer?
No. ALL is most common in young children, but it can also occur in adults, including after age 50. Symptoms and general urgency are similar across ages, though treatment approaches differ by age and other factors.
Questions to ask your doctor
Being prepared helps you get the most out of your appointments. Save or print these questions.
Tap a question to save it to your list (kept on this device).
Speak With Trained Specialists & Human Navigators
Cancer Explained provides educational guidance, but does not replace trained specialists, social workers, or your medical team.
Talk to a trained cancer information specialist
Free, confidential assistance from NCI Cancer Information Service via phone, chat, or email.
Contact your oncology team
Locate after-hours contact numbers, portal messages, or urgent triage phone lines.
Find a patient navigator
Get one-on-one help with appointments, logistics, translation, and care coordination.
Find a genetic counselor
Discuss inherited mutation risk, family history, and genetic testing options.
Find an oncology social worker
Access emotional counseling, family support groups, and mental health resources.
Find a financial navigator
Locate copay assistance foundations, grant programs, and lodging/travel support.
Find a clinical-trial specialist
Search matching studies and speak with NCI trial information specialists.
Get urgent help
Immediate emergency guidance for fever (>100.4°F during chemo), severe pain, or shortness of breath.
Help Us Improve This Guide
Did this explanation answer your question and help you determine your next step?
Know someone who needs this?
Plenty of people are looking for something like this and do not know where to start. If this would help a friend or someone you love, send it on — we have written an opening line so you do not have to stare at an empty message. You can change every word of it.
Your message is written and sent in your own email or messaging app — we never see who you send it to, and nothing is added to any list.
Plain-language explanation of the federal sources cited on this page. AI-assisted, source-checked, not clinician-reviewed.
Last updated: 2026-08-03Next planned review: 2027-02-03
How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes. We do not employ clinicians and do not intend to — our work is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status — Source verified. This page was created with AI assistance and checked against the sources listed on it. Source checking is not a medical review.
High-risk topic — talk to your care team. This topic can involve urgent, individual medical decisions. This page is general education only: it cannot tell you whether your situation is an emergency or what you personally should do. Follow your oncology team's instructions and contact them for individual guidance.
Human medical review: not completed. Cancer Explained is not clinician-reviewed, and that is a deliberate design choice rather than a gap we are waiting to close. We restate published federal guidance and cite it; the authority belongs to the source, not to us. That is why every page names where its claims come from — so you can verify us instead of trusting us. Use it to understand your situation and to ask better questions of the people treating you.
How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes. We do not employ clinicians and do not intend to — our work is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source verified — This page was created with AI assistance and checked against the sources listed on it. Source checking is not a medical review.
Human medical review: not completed. Cancer Explained is not clinician-reviewed, and that is a deliberate design choice rather than a gap we are waiting to close. We restate published federal guidance and cite it; the authority belongs to the source, not to us. That is why every page names where its claims come from — so you can verify us instead of trusting us. Use it to understand your situation and to ask better questions of the people treating you.
Read more about our editorial process, our use of AI, and our corrections policy.
Spotted a problem? Report an error — a factual mistake, broken or outdated source, confusing wording, or anything that seems unsafe. Please do not include names, medical record numbers, dates of birth, addresses, or other identifying medical information in your report.
After using this page, do you understand what to do next?
Anonymous — we only record the answer, never who gave it.
Related articles
- Acute Lymphoblastic Leukemia (ALL): What to Know
- ALL Risk Groups: How Outlook Is Predicted
- ALL: Pathology and Molecular Results
- Leukemia Symptoms: What to Watch For and When to Get Help
- Acute vs. Chronic Leukemia: What's the Difference?
- Neutropenic Fever During Cancer Treatment
- Newly Diagnosed With ALL: First Steps
Still have questions?
Educational answers, plain language
Free to print and share