The short answer
The National Cancer Institute's Cancer Information Service lets you talk to a trained information specialist for free. You can reach it at 1-800-4-CANCER (1-800-422-6237), Monday through Friday, 9 a.m. to 9 p.m. ET, by online chat during the same hours, or by email. Service is available in English and Spanish. It gives information, not medical advice.
The service is reachable at 1-800-4-CANCER (1-800-422-6237), Monday through Friday, 9 a.m. to 9 p.m. ET.
You can also use NCI's LiveHelp online chat during the same hours, or email [email protected].
Service is offered in English and Spanish, and NCI describes it as free and confidential.
Specialists answer questions on general cancer information, prevention and screening, symptoms and risk factors, treatment options, finding treatment, clinical trials, living with cancer, tissue donation, and NCI programs.
Choose how you want to understand this
The full explanation.
A phone number most people never dial
There is a federal phone line where a trained person will talk through cancer questions with you. It costs nothing. Most people with cancer never learn it exists.
It is the National Cancer Institute's Cancer Information Service. The number is 1-800-4-CANCER, which spells out as 1-800-422-6237. NCI lists it as open Monday through Friday, 9 a.m. to 9 p.m. Eastern time.
If a phone call feels like too much, there are two other doors. NCI offers LiveHelp instant messaging during the same hours. There is also an email address, [email protected].
Service is available in English and Spanish. NCI describes it as free and confidential.
What they will actually talk about
NCI lists the topics its information specialists cover. It is broader than most people expect:
- General cancer information
- Prevention and screening
- Symptoms and risk factors
- Treatment options
- Finding treatment
- Clinical trials
- Living with cancer
- Tissue donation
- NCI programs
That range covers a lot of the questions that pile up between appointments. What does this word on my report mean. What kinds of treatment exist for this. How do trials work. Where do people go for care like this.
What the service can do for you today
It can slow things down.
The most common reason to call is not a missing fact. It is that you have too many facts and no order to them. A conversation with someone who does this all day can turn a jumble into a short list.
It can also explain without pressure. The specialist is not the person delivering your prognosis, and not the person whose schedule you feel bad about taking up. That changes what you feel able to ask.
It can help you prepare. If your next appointment is fifteen minutes long, spending twenty minutes on a call first is a good trade. You arrive knowing which questions are yours to ask.
And it can serve the caregiver. Nothing about the service requires the caller to be the patient. A spouse, an adult child or a friend can call to understand what is happening.
What the service cannot do
It cannot give medical advice. NCI says this directly. Its cancer information is provided for general knowledge and is not a substitute for a doctor's advice.
So no one on the line will read your scan, tell you which chemotherapy to accept, or say whether your oncologist is right. They cannot second-guess a plan they have no records for.
It cannot enroll you in a trial. It can help you understand what is out there. The study team decides eligibility.
It cannot handle an emergency. If something is urgent, that call goes to your care team or to emergency services, not to an information line.
It is not a 24-hour service. The listed hours are weekday hours, in Eastern time. If you are on the West Coast at 7 p.m., the line is closed.
And it cannot arrange or pay for your care.
How to make one call count
A little preparation changes the quality of the conversation.
Write down the exact wording of your diagnosis before you dial, including the type and, if you know it, the stage. Precision here saves ten minutes.
Bring three questions, not thirty. Put the one that has been keeping you awake first, in case the call ends sooner than you hoped.
Ask them to spell things. Terms are easier to look up later when you have them written correctly.
Ask what they can send you. NCI publishes a great deal of patient material, and having something to reread is often more useful than remembering a call.
The separate line for quitting smoking
NCI also lists a distinct quitline: 1-877-44U-QUIT, or 1-877-448-7848, staffed by trained counselors who help people stop smoking.
That is a different service with a different purpose. If quitting is what you need, that number goes straight to people trained for it, rather than to general cancer information.
Before you call
Phone numbers, hours and services change. Check the current details on the contact page at cancer.gov before you rely on them, especially if you are planning around a particular time.
And treat the call as a companion to your care, not a replacement for it. The specialist gives you information and language. Your own team gives you decisions.
Words to know
Tap any term to see what it means.

Common questions
How much does it cost?
Nothing. NCI describes the service as free and confidential.
What is the number and when can I call?
1-800-4-CANCER, which is 1-800-422-6237, Monday through Friday from 9 a.m. to 9 p.m. Eastern time. Hours can change, so check the contact page on cancer.gov if you are calling from a different time zone.
Can I chat or email instead of calling?
Yes. NCI offers LiveHelp instant messaging during the same hours as the phone line, and an email address, [email protected].
Is there help in Spanish?
Yes. NCI lists services in English and Spanish.
Will they tell me which treatment to pick?
No. They can explain what treatment options exist and what the terms mean. NCI states its information is not a substitute for a doctor's advice, so the decision stays between you and your care team.
Can they help me find a clinical trial?
Clinical trials are on the list of topics specialists answer questions about, and NCI also runs a trial search on its site. They can help you understand and navigate listings.
Is there help for quitting smoking?
NCI lists a separate quitline, 1-877-44U-QUIT (1-877-448-7848), staffed by trained counselors for smoking cessation.
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).
Your next step
Turn this topic into questions for your next appointment.
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.
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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.
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Access emotional counseling, family support groups, and mental health resources.
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Locate copay assistance foundations, grant programs, and lodging/travel support.
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Search matching studies and speak with NCI trial information specialists.
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Sources last checked: 2026-09-03 what this meansLast updated: 2026-09-03Next planned review: 2027-09-03
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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, 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: Editorial review complete — This page completed Cancer Explained's editorial checks (sources, safety, plain language, duplication). It has not been reviewed by a physician or other healthcare professional.
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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