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Side Effect Library

22 side effects explained — what they are, why they may happen, and questions to ask your care team.

Play & practice

12 game lessons, knowledge checks for every article, and flashcards — learning that feels helpful, never like homework.

Downloads & printables

45 download-center resources and 40 printable one-pagers — checklists, trackers, note pages, and guides.

News & fresh content

701 news explainers connecting current events to trustworthy cancer education.

Give & share support

50 free e-card designs plus giving options that keep all of this free.

What’s new — changelog

How Cancer Explained has grown, release by release.

  1. August 22, 2026

    Video, everywhere it helps — and a clean-up pass across the library

    • Forty-nine more short videos joined the library, and every one of our videos now has a single page where you can browse them all. Alongside that, a sweep of every published page fixed photo captions that were showing internal file names, repaired links that pointed nowhere, and corrected one symptom page that named the wrong temperature.
    • Forty-nine new one-minute videos cover the basics, screening, prevention, warning signs and the claims people most often search — all captioned, with no ads and no tracking.
    • Every video now lives on one browsable page, grouped by what you are trying to work out. Before this, you could only find one by landing on the right guide.
    • Photographs across the library were showing internal catalogue names as their captions. Those are gone — a caption is now either real descriptive text or nothing at all.
  2. August 21, 2026

    Watch it explained: 30 short videos, captioned and checked

    • Cancer Explained now has video. Thirty short explainers — how to read a pathology report, staging and TNM, biopsy results, frightening scan language, and the most-asked myth checks — play right on the relevant pages: self-hosted, captioned, no ads, no tracking. Every narration script was checked line by line against the site's sourced pages before rendering, the same standard our articles are held to.
    • Seven walkthrough explainers cover whole reports — pathology, imaging, staging, grade vs. stage, margins, tumor markers — and appear on the matching guides and the reports hub.
    • Twenty-three quick answers, each about a minute: single report terms like invasive, in situ, Ki-67, HER2, Gleason and BI-RADS, plus everyday questions — does sugar feed cancer, does 5G, what actually causes it.
  3. August 21, 2026

    44 new guides and research explainers, checked line by line against federal sources

    • A survey of the topics people encounter in cancer news led to 44 new pages: 38 plain-language guides — from reading an eosinophil count to caregiving during radiation — and 6 explainers on recent FDA approvals and major trial results. Every page was written from NCI, FDA, CDC and NIH sources, then independently fact-checked against those sources before publication.
    • New everyday-question guides: bone scans, colon polyps found at colonoscopy, 2D vs 3D mammograms, lung cancer in people who never smoked, skin cancer in people of color, and more.
    • Six research explainers translate recent advances — the CHALLENGE exercise trial in colon cancer, the INTERLACE, CROWN, LAURA and NADINA trials, and the FDA approval of revumenib for acute leukemia — into what was actually shown, and what was not.
    • Four new claim checks weigh popular claims — fenbendazole, ivermectin, base tans, and chocolate — against what FDA and NCI actually say.
  4. August 21, 2026

    Honest dates on every page, and clearer nonprofit facts up front

    • August's accuracy and safety passes changed thousands of pages, but the pages kept their older “last updated” dates. Every article now shows the date its content actually last changed, in English and Spanish. The homepage mission now states our IRS-recognized 501(c)(3) status plainly, and two practical tools that search engines could not find are now in our sitemap.
    • More than 3,100 articles now display the date they were truly last revised, reflecting this month's fever-threshold, medicine-safety and accuracy work — so “Last updated” means what it says.
    • The homepage mission band now says plainly that Cancer Explained is a program of an IRS-recognized 501(c)(3) nonprofit public charity — the same facts our About and Transparency pages document.
    • The Symptom Diary and Next Steps Tracker are now listed in our sitemap, so search engines — and you — can find them.
  5. August 20, 2026

    One temperature, one rule: 100.4°F, on every page

    • Two trusted sources give two different fever thresholds for chemotherapy — CDC says 100.4°F (38°C), while NCI prints 100.5°F beside the same Celsius figure. As of today every page on this site teaches the lower, safer number, an automated check keeps it that way, and our medicine guides now draw a clean line between what you handle at home and what only your treatment team runs.
    • Every page that names a fever threshold during cancer treatment now says 100.4°F (38°C), matching CDC — in English, Spanish, and every other language we publish. Where a page quotes NCI’s printed 100.5°F, it now also shows the conversion and tells you to act on the lower number. A new automated check blocks any future page from teaching the higher one.
    • Medicine guides now follow one rule. Amounts you handle at home — tablet strengths, missed-dose rules — stay on the page, tied to your own prescription label. Schedules only your treatment team runs — dose build-ups, infusion amounts, monitoring calendars — live where they belong: in your prescription, not on a web page that cannot know your kidneys, your liver, or your other medicines.
    • The money-saving guide now says plainly what was always true: tips like splitting tablets or partial refills are for supportive medicines, never for the cancer drug itself — with a direct route to real financial help for the drug that actually costs the most.
  6. August 19, 2026

    The melanoma vaccine result, explained in four parts, and a safety review of every translated page

    • This week's news writing takes two stories people are arriving confused about and explains what the findings actually support — including four pages on the melanoma trial alone, because most of the confusion is in the difference between what it measured and what people think it measured. Alongside them, our pages in eleven other languages were reviewed against their English versions so that the when-to-get-help guidance reads the same in every one.
    • A phase 3 trial of a personalized mRNA therapy plus pembrolizumab reported that melanoma took longer to come back after surgery. The result is real, the numbers are not published yet, and overall survival is not mature — the article says all three.
    • Three companion pieces go under that headline: what a therapy built from one person’s own tumor actually is, why “recurrence-free survival” is not the same as living longer, and what the result changes for someone who has already had melanoma removed — which, today, is nothing.
    • A study linking daily sugary drinks to stomach cancer was widely reported as nearly tripling the risk. That is accurate, and the absolute risk stays small: 278 cancers among 112,284 people over 36 years.

Everything here is educational only — not medical advice. Cancer Explained does not diagnose, recommend treatment, or replace your healthcare team. Content is based on National Cancer Institute resources; NCI does not endorse this site.