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 treatment right away.
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This page is for anyone who wants to know the signs of ALL. It lists common symptoms and the ones that need help right away.
The simple version
Acute lymphoblastic leukemia (ALL) is a fast-growing cancer. It starts in the blood-forming cells of the bone marrow.
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): tiredness, weakness, dizziness, pale skin, and shortness of breath.
- Low healthy white blood cells: infections that keep coming back or will not clear, often with fever.
- Low platelets: bruising, small red or purple spots on the skin, nosebleeds, bleeding gums, and heavy periods.
Other common symptoms
- Fever, night sweats, loss of appetite, and weight loss.
- Swelling or fullness in the belly, from a large liver or spleen.
- Swollen lymph nodes in the neck, underarm, or groin.
- Bone or joint pain. Leukemia cells can build up near bone surfaces or inside joints.
Less common: spread to other organs
Less often, ALL spreads beyond the blood and bone marrow. It can reach the brain, spinal cord, chest, skin, eyes, testicles, ovaries, or kidneys. Symptoms then depend on where it has gone.
Get help right now
Call 911 or go to the nearest emergency department for:
- Swelling of the face, neck, or arms with headaches, dizziness, or trouble breathing. This can be superior vena cava (SVC) syndrome. The American Cancer Society says it can be life-threatening and needs treatment right away.
- Bleeding that will not stop, black or tarry stool, or vomit that is bloody or looks like coffee grounds.
- A seizure, sudden confusion, or being hard to wake.
- Trouble breathing or chest pain.
- Sudden inability to pass urine at all.
Call your care team right away, day or night, for:
- A fever of 100.4°F (38°C) or higher, or shaking chills, during or after treatment. The CDC says to call your doctor right away, because a fever may be the only sign of an infection that can be life-threatening. If you cannot reach your team quickly, go to an emergency department and tell them at once that you are having cancer treatment. See Neutropenic Fever During Cancer Treatment.
- A sore throat, mouth sores, burning when you pass urine, or any other sign of infection. Call even if your temperature is normal. A normal temperature is not a reason to wait.
- Sudden heavy bruising, or a new rash of small red or purple spots.
- A new headache, vomiting, trouble with balance, facial numbness, blurred vision, or weakness. These can signal spread to the brain or spinal cord.
- Severe lightheadedness.
Do not wait for the next scheduled visit for any sign on this list.
Why prompt evaluation matters
ALL grows quickly. So once it is suspected, it almost always needs a prompt check by a hematologist-oncologist, a doctor who specializes in blood cancers. Not every decision has to happen 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
Common questions
How quickly do ALL symptoms usually appear?
NCI says ALL usually gets worse quickly if it is not treated, so symptoms can build fast. See a doctor promptly if you notice them.
Why does ALL cause bone or joint pain?
Leukemia cells can build up near bone surfaces or inside joints, causing pain.
What is superior vena cava (SVC) syndrome?
The American Cancer Society says it can be life-threatening and needs treatment right away. It can occur when an enlarged thymus (a gland in the chest) presses on the superior vena cava, the large vein that carries blood from the head and arms back to the heart. It causes swelling of the face, neck, arms, and upper chest, along with headaches, dizziness, and sometimes changes in consciousness. An enlarged thymus can also press on the windpipe and cause coughing or trouble breathing.
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.
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Get urgent help
Fever of 100.4°F (38°C) or higher during chemo, severe pain, or trouble breathing: call your cancer care team right away, day or night. Call 911 for an emergency.
Plain-language explanation of the published sources cited on this page. AI-assisted, source-checked, not clinician-reviewed.
Last updated: 2026-09-29Next planned review: 2027-02-03
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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, and this 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 checked — This page was written with AI assistance and then compared with the sources listed on it, looking for statements those sources do not back up. That check is not a sentence-by-sentence record and can miss errors. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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