How to Identify Reliable Health Information in the Digital Age

Reliable health information online does five things: it names the source of its numbers, says exactly what each number measures, states which patients the number applies to, shows when it was last updated, and makes clear who publishes it and why. Those five checks catch most of the problems a patient or caregiver will run into. Each takes a few minutes per page. The National Library of Medicine's MedlinePlus tutorial on evaluating internet health information frames the same idea as three questions: who runs the site and why, how good the information is, and what the site does with your personal data.

The checks matter more now because patients read their own data before they talk to a doctor. In 2024, 65% of U.S. individuals accessed their online medical records at least once, and 76% of people with a recent cancer diagnosis did, according to an ASTP/ONC data brief built on the National Cancer Institute's HINTS 7 survey. Lung cancer survival rates make a good worked example. One simple search can return several different figures, each reflecting a different population or reporting period.

What Makes a Health Statistic Reliable?

A reliable statistic can be traced back to the organization that produced it, and it comes with enough context to tell you who it describes. Effective content design also helps present complex health information in a clear, organized way, making statistics easier for readers to understand. The MedlinePlus checklist groups those questions under four headings: provider, purpose, information quality, and privacy. Applied to a single number, those questions become five practical checks.

Why the "Purpose" Check Still Matters

MedlinePlus advises readers to find the "About Us" page and confirm who manages a site and why it exists. A page can cite good data and still frame it to steer readers toward a product or service. Knowing the publisher's purpose lets you weigh its framing while still checking its numbers against the primary source.

Why Do Lung Cancer Survival Rates Differ From One Website to the Next?

Survival figures differ because sources use different staging systems, cancer subtypes, and diagnosis years. Those differences do not automatically make a figure wrong; they mean the numbers may describe different groups of people.

Here's how the cited sources present early-stage lung cancer survival, using different definitions:

"Localized" Is Not the Same as "Stage 1"

The American Cancer Society notes that the SEER database does not group cancers by AJCC TNM stage. SEER sorts cases into localized, regional, and distant, based on how far the cancer has spread. SEER's own fact sheet notes that localized is sometimes loosely called stage 1, but TNM stage 1 is narrower: in non-small cell lung cancer, stage IA covers tumors of 3 centimeters or smaller, and stage IB covers tumors between 3 and 4 centimeters that have not reached the lymph nodes. SEER's localized category is defined by spread, not tumor size, so it doesn't map one-to-one onto TNM stage 1.

Subtype matters just as much. The American Cancer Society's localized figure for NSCLC (67%) is roughly double its figure for SCLC (34%), although the two cover different diagnosis years. A statistic that blends both types will sit between them.

Checking Where a Figure Comes From

One quick test: does the page tell you where its numbers come from? Lung Cancer Group, a U.S.-based patient-education resource covering lung cancer, mesothelioma, and asbestos-related disease, publishes fact-checked guides that cite clinical sources such as the American Cancer Society and Roswell Park Comprehensive Cancer Center.

Its guide to the stage 1 lung cancer survival rate, for example, attributes its five-year survival range of 70% to 90% to Roswell Park Comprehensive Cancer Center and lists 14 numbered references at the end of the page, so readers can examine its references rather than taking the range on trust. The page also shows a last-updated date, which answers the "Date" check in a single glance.

An Illustrative Scenario

Consider a hypothetical caregiver whose father has just been diagnosed with stage IA NSCLC. She finds 65.5% on one page and 70–90% on another, and the gap alarms her. The citations explain it. The first figure is SEER's localized category, which includes small cell cancers and groups patients by spread. The second is a TNM stage 1 range attributed to a cancer center. They refer to different groups and should not be compared as though they measure the same thing. Neither predicts her father's outcome. She brings both figures to his next appointment and asks the oncologist which one is closer to his situation.

How Can Families Share Health Information Without Losing Accuracy?

Families often coordinate care across group chats, email threads, and patient portals. Proxy or caregiver access to patient portals more than doubled between 2020 and 2024, from 24% to 51%, according to the same ASTP/ONC data brief. The brief also found that 59% of individuals had more than one online medical record or patient portal in 2024, which means information about one patient often sits in several places.

Share the Link, Not the Screenshot

A screenshot of a statistic strips out the source, the date, and the definition. Sharing the original link keeps all three attached, so relatives can run the same checks. A pinned message in the family chat that lists the two or three pages everyone agrees to trust, such as the American Cancer Society, MedlinePlus, and the patient's portal, keeps later conversations anchored to the same sources.

Keep Clinical Details in Secure Channels

HIPAA's privacy and security rules apply to health plans, health care clearinghouses, most health care providers, and their business associates. They do not apply to a family group chat. Healthcare organizations may use HIPAA-compliant messaging apps with access controls and audit logs to help protect sensitive communications. Managing digital health information also requires healthcare organizations to balance data security with the cost of maintaining their systems. They can review their cloud storage and infrastructure usage to optimize cloud costs while maintaining secure access to patient information.

Families can borrow the same habit: send test results and medication details through the patient portal's secure messaging, and if a family discussion must include sensitive details, choose end-to-end encrypted communication tools, which can limit access to message content when properly implemented.

What Questions Should You Bring to the Care Team?

The American Cancer Society states that survival rates are estimates based on large groups and cannot predict what will happen in any one person's case. It also notes that these figures reflect people diagnosed at least five years earlier, so patients diagnosed today may have a better outlook than the numbers show. That's why the care team is the right place to turn a population statistic into a personal discussion.

Questions worth bringing, written down before the visit:

• Which staging system applies to this diagnosis, and what is the exact stage?
• Is this cancer NSCLC or SCLC, and which subtype?
• Which survival figure is closest to this situation, and what factors (age, overall health, biomarker results, treatment plan) shift it?
• Where can we read reliable information between appointments?

Screening shapes these statistics too. The U.S. Preventive Services Task Force recommends annual low-dose CT screening for adults aged 50 to 80 with a 20 pack-year smoking history who currently smoke or quit within the past 15 years. The American Lung Association's 2025 "State of Lung Cancer" report found that only 18.2% of people at high risk were screened, and only 28.1% of cases were diagnosed at an early stage. Family members who meet the screening criteria can raise it with their own clinicians.

Frequently Asked Questions

How can I tell whether a cancer survival statistic I found online is trustworthy?

Check whether the page names its source, says what the figure measures (for example, five-year relative survival), and specifies the cancer type and stage it applies to. Well-sourced patient-education sites list their clinical references, which lets readers check figures against primary sources like the National Cancer Institute's SEER program. Your oncologist can then explain how the number applies to your own case.

What does "five-year relative survival" mean?

It compares people who have a specific cancer type and stage with people in the general population. The American Cancer Society explains that a 60% five-year relative survival rate means people with that cancer are, on average, about 60% as likely as people without it to live at least five years after diagnosis.

Why do websites list different stage 1 lung cancer survival rates?

Sources use different staging systems, cancer subtypes, and diagnosis years. The NCI SEER program groups cases as localized, regional, or distant, while cancer centers often report by TNM stage, and NSCLC and SCLC have very different outcomes. A page that states its source and definitions lets you see which group a figure describes.

Who should I ask about how a statistic applies to me?

Your oncologist or care team, who know your stage, subtype, and overall health. The American Cancer Society also runs a 24/7 cancer helpline at 1-800-227-2345 for general questions between appointments.

When should I worry that a health page is out of date?

Look for a last-updated date and the years the data cover. The American Cancer Society's NSCLC figures, for example, reflect people diagnosed between 2015 and 2021. If a page shows no date at all, compare its figures against a dated primary source before relying on them.

How can a caregiver get access to a patient's medical records?

Many patient portals, including Epic's MyChart, offer proxy access that the patient authorizes. According to ASTP/ONC, proxy or caregiver access to patient portals rose from 24% in 2020 to 51% in 2024. Ask the clinic's front desk or the portal's help page how to set it up.

What is the safest way to share health information in a family group chat?

Share links to original sources rather than screenshots, so the source and date travel with the figure. Keep test results, diagnoses, and medication details inside the patient portal's secure messaging, because personal family chats generally fall outside HIPAA protections.