The short answer
A rise in liver enzymes usually shows up on routine blood work before you feel anything. One high value is not a diagnosis, since age, weight, medicines and supplements all shift the number. Liver injury from a drug most often clears within days or weeks once that drug is stopped.
A rise in liver enzymes usually shows up on routine blood work before you feel anything, so keep scheduled draws.
Liver function panels measure albumin, ALP, ALT, AST, GGT, bilirubin and prothrombin time.
A high ALT alone does not mean disease, since age, sex, weight, medicines and supplements all affect the number.
Drug-induced liver injury most often clears within days or weeks after the medicine causing it is stopped.
Choose how you want to understand this
The full explanation.
The number changes before you do
A rise in liver enzymes usually shows up on a scheduled blood draw. Nothing has to feel wrong first. MedlinePlus describes the ALT blood test as part of a routine blood screening to check the health of your liver. The test may also help diagnose or track liver problems. The National Cancer Institute makes the same point about immunotherapy: "Some people have mild hepatitis, which is diagnosed during a blood test."
That is the practical takeaway. You cannot monitor your liver by how you feel. Keep the blood tests your team schedules, even in a week when you feel well.
What is being measured
MedlinePlus lists what liver function tests usually include. Albumin, a protein made in the liver. Four enzymes: ALP (alkaline phosphatase), ALT (alanine transaminase), AST (aspartate aminotransferase), and GGT (gamma-glutamyl transferase). Bilirubin, a waste product your body makes when it breaks down old red blood cells. And prothrombin time (PT), which is how long your blood takes to clot.
ALT is an enzyme found mainly in your liver. A high level of ALT in your blood may be a sign of liver injury or disease. Bilirubin is what turns skin and eyes yellow when it builds up. MedlinePlus says high bilirubin levels may mean your liver isn't working right.
A high result is not a diagnosis
MedlinePlus is direct about this. Here is what it says on liver function tests: "Abnormal results don't always mean you have a problem with your liver. Other conditions can cause high or low levels of certain substances that these tests measure." On ALT: "If your results show you have a high level of ALT, it doesn't always mean that you have a medical condition that needs treatment. Many things can affect your results, such as your age, sex, weight, and certain medicines and dietary supplements." Bilirubin above normal can also come from some medicines, certain foods, or hard exercise.
One flagged value on a portal result is a reason to ask. It is not a reason to assume the worst overnight.
Why a dose gets held or changed
MedlinePlus defines drug-induced liver injury. It is an injury of the liver that may occur when you take certain medicines. The fix is usually simple. MedlinePlus says: "The only specific treatment for most cases of liver damage caused by taking a medicine is to stop taking the medicine that caused the problem." The injury most often goes away within days or weeks after you stop that drug.
In cancer care that usually means a pause or a change. It rarely means an ending. NCI says: "Sometimes your doctor may change your chemotherapy schedule if you are having certain side effects. If this happens, your doctor or nurse will explain what to do and when to start treatment again." Immune-related inflammation is sometimes managed with medicines, NCI says. Steroids are one example. They slow down an overactive immune response.
There is a gap here worth naming. Patient-facing sources do not publish the enzyme levels at which a dose is held, reduced, or resumed. That depends on the drug, the size of the rise, the pattern across tests, and your own history. Only your oncologist can judge it. Ask what your numbers were, and ask what would change the plan.
Symptoms that mean calling promptly
MedlinePlus lists the symptoms of liver disease or damage. Nausea and vomiting. Lack of appetite. Fatigue. Weakness. Jaundice, a condition that causes your skin and eyes to turn yellow. Dark-colored urine. Light-colored or clay-colored stool. Abdominal swelling or pain. Ankle and leg swelling. Frequent itching. NCI describes liver inflammation from immunotherapy in similar terms. Your skin and eyes may be yellowish. You may also have nausea or vomiting, stomach pain, fatigue, darker urine, and bleeding or bruising.
NCI's instruction is clear. "It's important to have any possible inflammatory problems assessed by your oncologist." Your oncologist "may advise you to call him or her first about inflammatory symptoms, or you may be advised to seek emergency medical care." Ask in advance which one applies to you. MedlinePlus gives three more reasons to contact your provider. If these symptoms appear after you start a new medicine. If they persist after you stop it. Or if new symptoms develop.
Do not add anything new without asking
MedlinePlus names common causes of drug-induced liver injury. Acetaminophen is one, especially at high doses. So are NSAIDs, such as ibuprofen. Dietary supplements can affect your results too. So ask your oncology pharmacist or nurse first. Do that before you add any over-the-counter medicine, herbal product, or supplement. NCI gives separate advice for a fever. Talk with your doctor or nurse before you take aspirin, acetaminophen (such as Tylenol), or ibuprofen (such as Advil).
If you are on immunotherapy, immunotherapy hepatitis: what to ask goes further. Creating a cancer symptom and call plan covers writing your team's thresholds down before you need them.
When to get help sooner
Most enzyme rises are picked up on a blood test and handled at the next visit. A few signs are not on that timetable.
- Call 911 or go to an emergency department if you become confused, drowsy or hard to rouse, your speech or handwriting changes, your hands develop a coarse tremor, or you have a seizure. MedlinePlus warns that loss of brain function from liver disease can worsen quickly and become a medical emergency.
- Call 911 or go to an emergency department if you vomit blood or pass black tarry stools, your abdomen becomes severely painful or rigid, or you have taken more acetaminophen than the label allows. MedlinePlus says acetaminophen overdose needs treating in an emergency department as soon as possible.
- Call your care team the same day if your skin or the whites of your eyes turn yellow, your urine goes dark, your stools go pale or clay-coloured, or your belly or ankles swell quickly.
- Call your care team within a day or two if nausea, itching, appetite loss or unusual tiredness starts after a new medicine, or these symptoms carry on after you stop it.
Ask your oncologist in advance which of these they want a call about first, and which should go straight to emergency care.
Sources
- MedlinePlus Medical Encyclopedia, Loss of brain function - liver disease: https://medlineplus.gov/ency/article/000302.htm
- MedlinePlus, Liver Function Tests: https://medlineplus.gov/lab-tests/liver-function-tests/
- MedlinePlus, ALT Blood Test: https://medlineplus.gov/lab-tests/alt-blood-test/
- MedlinePlus, Bilirubin Blood Test: https://medlineplus.gov/lab-tests/bilirubin-blood-test/
- MedlinePlus Medical Encyclopedia, Drug-induced liver injury: https://medlineplus.gov/ency/article/000226.htm
- National Cancer Institute, Immunotherapy and Organ-Related Inflammation: https://www.cancer.gov/about-cancer/treatment/side-effects/organ-inflammation
- National Cancer Institute, Chemotherapy to Treat Cancer: https://www.cancer.gov/about-cancer/treatment/types/chemotherapy
- National Cancer Institute, Infection and Neutropenia during Cancer Treatment: https://www.cancer.gov/about-cancer/treatment/side-effects/infection
Words to know
Tap any term to see what it means.
Common questions
How would I know my liver enzymes have risen?
Usually from a scheduled blood draw, with nothing feeling wrong first. MedlinePlus describes the ALT blood test as part of a routine blood screening to check the health of your liver, and NCI notes that some people have mild hepatitis which is diagnosed during a blood test. You cannot monitor your liver by how you feel, so keep the blood tests your team schedules even in a week when you feel well.
What is actually measured in a liver function test?
Albumin, a protein made in the liver. Four enzymes: ALP, ALT, AST and GGT. Bilirubin, a waste product your body makes when it breaks down old red blood cells. And prothrombin time, which is how long your blood takes to clot.
Does one high result mean my liver is damaged?
No. MedlinePlus says abnormal results do not always mean you have a problem with your liver, because other conditions can cause high or low levels. On ALT it adds that many things can affect your results, such as your age, sex, weight, and certain medicines and dietary supplements. One flagged value on a portal result is a reason to ask, not a reason to assume the worst overnight.
Does a rise mean my treatment stops?
Usually it means a pause or a change rather than an ending. MedlinePlus says the only specific treatment for most cases of liver damage caused by a medicine is to stop taking that medicine, and the injury most often goes away within days or weeks afterwards. NCI says your doctor may change your chemotherapy schedule, and that your doctor or nurse will explain what to do and when to start treatment again.
At what number would my dose be held?
Patient-facing sources do not publish the enzyme levels at which a dose is held, reduced or resumed. It depends on the drug, the size of the rise, the pattern across tests and your own history, so only your oncologist can judge it. Ask what your numbers were, and ask what would change the plan.
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 published sources cited on this page. AI-assisted, source-checked, not clinician-reviewed.
Written by: Cancer ExplainedSources last checked: 2026-08-13 what this meansLast updated: 2026-08-18Next planned review: 2027-01-28
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 checked. This page was written with AI assistance and checked line by line against the sources listed on it. That confirms the sources support what the page says. It is not a medical review, and it does not confirm the page is complete or right for your situation.
General education — varies by person. Answers genuinely differ between people. This page explains what commonly varies and points you to your care team 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.
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 checked — This page was written with AI assistance and checked line by line against the sources listed on it. That confirms the sources support what the page says. 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.
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
Still have questions?
Educational answers, plain language
Free to print and share