Understanding Cancer Doesn’t Have To Be Overwhelming
Cancer Explained transforms trusted National Cancer Institute resources into easy-to-understand educational experiences for patients, caregivers, families, and anyone wanting to learn more.
Explore by topic
Cancer Basics
What cancer is, how it starts, and how it spreads — explained simply.
Cancer Types
Plain-language explanations of specific cancers.
Treatments
How chemotherapy, radiation, surgery, immunotherapy, and other treatments work.
Side Effects
Understanding and managing the side effects of cancer and its treatment.
Symptoms
Common symptoms of cancer and when to talk to a doctor.
Diagnosis & Staging
Tests, biopsies, staging, and what your results mean.
Screening
Tests that look for cancer before symptoms appear.
Prevention & Risk
Risk factors and what may help lower cancer risk.
Clinical Trials
How research studies work and what joining one means.
Living With Cancer
Day-to-day life, emotions, nutrition, and survivorship.
Caregivers
Support and guidance for people caring for someone with cancer.
Where are you in your journey?
Guided reading paths that meet you where you are — each step links to a plain-language explanation based on NCI resources.
“I've just been diagnosed.”
Start here to understand what cancer is, what your diagnosis and stage mean, and what comes next.
5 steps →
“I'm starting treatment.”
Understand your treatment options and how to prepare for and manage side effects.
5 steps →
“I'm caring for someone.”
Practical guidance for supporting someone with cancer — and for taking care of yourself too.
4 steps →
“I want to understand cancer.”
A grounding tour of what cancer is, what causes it, and how it's found and prevented.
5 steps →
“I'm interested in clinical trials.”
Understand what clinical trials are, how they work, and what joining one involves.
3 steps →
Start with the essentials
Diagnosis & Staging
Cancer Staging: What the Stage Means
A plain-language explanation of cancer staging, including the widely used TNM system and stage numbers, based on National Cancer Institute resources.
6 min read · Beginner
Clinical Trials
What Are Clinical Trials?
A plain-language explanation of what cancer clinical trials are, why they matter, and the main types, based on National Cancer Institute resources.
5 min read · Beginner
Cancer Basics
What Is Cancer?
A plain-language explanation of what cancer is, how cancer cells differ from normal cells, and how genetic changes cause cancer, based on National Cancer Institute resources.
8 min read · Beginner
Treatments
What Is Chemotherapy?
A plain-language explanation of how chemotherapy works, why it causes side effects, and what to expect, based on National Cancer Institute resources.
7 min read · Beginner
Treatments
What Is Immunotherapy?
A plain-language explanation of how immunotherapy helps the immune system fight cancer, based on National Cancer Institute resources.
7 min read · Beginner
Treatments
What Is Radiation Therapy?
A plain-language explanation of how radiation therapy works, the two main types, and what to expect, based on National Cancer Institute resources.
7 min read · Beginner
Built on trust
Evidence-based
Every explanation is based on National Cancer Institute educational resources, with links to the original.
Educational only
No medical advice, no diagnosis, no treatment recommendations — always talk with your healthcare team.
Free & accessible
Plain language, readable design, and accessibility built in from the start.