Don't Know Your Family Health History? How to Update It and When

Family health history is not a form you fill out once and forget. New diagnoses happen. Relatives learn more specific details about an old condition. A cause of death becomes known. Genetic testing may clarify a risk that used to be described only as “something that runs in the family.” Children grow into adults, and the information that matters for preventive care changes with them.

So how often should you update your family health history?

The most accurate answer is that there is no single evidence-based interval that fits everyone. The Centers for Disease Control and Prevention advises people to update family health history regularly and whenever new information is learned. For children, CDC specifically recommends checking with relatives between health visits for newly diagnosed conditions and sharing new information with the child’s health care provider.

That gives families a better framework than an arbitrary rule such as “every six months.” Use meaningful events and routine care as prompts. This guide explains which events matter, what information to capture, how to handle uncertainty, and how to share family history without treating it as a diagnosis.

Why family health history changes medical conversations

Family health history is a record of diseases and health conditions in biologically related family members. It can reflect shared genes, but it can also reflect shared environments and behaviors. It is not a genetic test and it does not predict the future with certainty.

CDC explains that family history can help a health care provider build a more complete picture of risk and decide whether certain screening tests or other interventions should be considered, including whether screening should begin earlier in some circumstances.

For example, the age at which a relative developed a condition can matter. “My mother had cancer” is less specific than “My mother was diagnosed with breast cancer at age 43.” Likewise, the pattern of a condition across several close relatives may be more informative than a vague statement that “heart problems run in the family.”

Family history is therefore most useful when it is specific, dated, and shared with a clinician who can interpret it in the context of your own age, health, symptoms, exposures, and other risk factors.

There is no universal update schedule

It is tempting to create a neat rule such as updating family history every January. A yearly review can be a useful household habit, but it should not be presented as a clinical requirement because CDC does not set one universal yearly or twice-yearly schedule for everyone.

Instead, CDC says to update the information regularly and when you learn something new. In practical terms, that means a family history should be treated as a living record.

A routine annual review is reasonable if it helps you notice gaps, but event-based updates are more important. If a parent is newly diagnosed with colorectal cancer in March, waiting until January to record it adds no benefit. Update the record when the information becomes known, then bring it to the next relevant clinical conversation.

The same applies when a diagnosis becomes more specific. “Cancer” may later be clarified as “pancreatic cancer.” “Heart problem” may become “hypertrophic cardiomyopathy.” Specific diagnoses can change what a clinician considers relevant.

Update after a new diagnosis in a close relative

A new diagnosis is one of the clearest reasons to revise your family history. Record which relative was affected, the specific condition if known, and the approximate age at diagnosis.

CDC’s adult family-health-history guidance suggests collecting information from close blood relatives on both sides of the family, including parents, siblings and half-siblings, grandparents, aunts, uncles, nieces, nephews, and children.

Do not pressure a relative to share information they consider private. Family health history can be sensitive. Ask respectfully and explain why the information may be useful. If they do not want to provide details, record only what they choose to share.

If a relative gives a vague description, do not convert it into a diagnosis yourself. Write “reported heart condition, exact diagnosis unknown” rather than guessing. Uncertainty documented clearly is more useful than false precision.

Update when a relative dies and the cause is known

Cause and age of death can be relevant parts of family history. CDC includes these among the pieces of information people may collect.

Again, avoid guessing. If the cause of death is uncertain or described differently by several relatives, note that. Official records, when available and appropriate to access, may clarify details, but a family organizer does not need to become an investigation project.

The purpose is to give a clinician useful context, not to reconstruct every medical detail from previous generations.

Update when genetic testing adds verified information

If you or a relative has genetic testing and chooses to share the result, that may be important to add to the family record. CDC advises adults who have had genetic testing to share results with family members because the information may be relevant to their relatives.

A genetic test result should be recorded accurately. Ideally, keep the actual laboratory report rather than a secondhand summary such as “the test was positive for the cancer gene.” Genetic results can be complex, and terms such as pathogenic variant, likely pathogenic variant, and variant of uncertain significance do not mean the same thing.

Do not use a relative’s result to diagnose yourself. Bring the verified report to a qualified clinician or genetics professional who can explain whether testing, screening, or counseling is appropriate for you.

Review family history before preventive-care visits

A routine checkup is a useful prompt to look at your family history because the information can influence preventive-care discussions. Before an appointment, scan the record for anything new since the last visit. Our list of questions to ask at a checkup includes how to raise family history changes.

You do not need to present a long family tree at every visit. Highlight changes and the patterns most relevant to the current conversation. If a new diagnosis occurred in a parent or sibling, say so. If the age of diagnosis was younger than you previously thought, update that detail.

CDC encourages people to collect family health history before visiting a provider and share what they know, even if the information is incomplete.

For a practical appointment-preparation system, Full Healthy Lives also has a separate annual physical checklist. Use the family history as one part of the information you bring, not as a replacement for your medication list, symptoms, test results, or current concerns.

Review before pregnancy or when planning a family

Family history can be especially relevant before and during pregnancy. CDC notes that family history of certain conditions can affect reproductive and prenatal conversations and encourages people to tell their health care provider about relevant conditions, previous pregnancy outcomes, birth defects, infant or childhood problems, and known genetic diagnoses in relatives.

If you are planning a pregnancy, this is a good time to update both sides of the family’s known health information. If a relative has a specific diagnosis or genetic test result, ask whether they are comfortable sharing the exact name or report. Bring it to your prenatal visits, and later to your postpartum appointment if new information comes up.

Do not wait for perfect information. CDC emphasizes that partial family history can still be useful. A clinician can help decide which missing details matter most.

Update a child’s family health history as relatives’ health changes

Children inherit family history from both sides of the family, and that history changes over time as relatives age and receive diagnoses.

CDC recommends updating a child’s family health history regularly, sharing new information with the child’s provider, and checking with relatives between visits to learn whether anyone has been newly diagnosed with a condition.

This does not mean turning every family diagnosis into a prediction about a child. CDC explicitly notes that having a family history of a disease does not mean a child will definitely develop it. The value is in giving the pediatric or family clinician enough context to decide whether monitoring, screening, or other steps are relevant.

As children become adolescents and adults, consider helping them learn the family history in age-appropriate language so they can eventually carry the information into their own health care.

What information is most useful to record

For each biologically related family member, record the relationship, major medical conditions, age at diagnosis when known, and age and cause of death for deceased relatives when known. CDC also identifies ancestry or ethnic background as information that can sometimes be relevant.

Specificity helps. “Colon cancer at about 46” is more useful than “cancer.” “Type 2 diabetes diagnosed in his 50s” is more useful than “blood sugar problems.” If the exact age is unknown, an approximate age can still be recorded as approximate.

Use neutral language and separate facts from stories. Families often pass down statements such as “everyone has weak hearts” or “the women in our family always have thyroid problems.” Those statements may point to a useful question, but they are not diagnoses. Record confirmed conditions separately from family reports that need clarification.

How far out in the family should you go?

CDC suggests collecting information on close blood relatives including parents, children, siblings, half-siblings, grandparents, aunts, uncles, nieces, and nephews. You can add other relatives when a pattern is relevant, but you do not need to document every distant relative for the record to be useful.

Prioritize first- and second-degree relatives and unusually early or repeated diagnoses. A clinician or genetic counselor may ask for more detail if a particular pattern is concerning.

If you are adopted, conceived through donor eggs or sperm, or have limited information about biological relatives, record what is known and say what is unavailable. Missing family history is not a personal failure, and care can still be based on your own health information, screening guidelines, and available evidence.

Use a tool, but keep the source information

CDC lists the Surgeon General’s My Family Health Portrait among tools for collecting family health history. A structured tool can make relationships and patterns easier to see.

Whether you use a website, spreadsheet, notebook, or family health organizer, keep track of where key information came from. A diagnosis reported directly by the affected relative is different from a guess passed through three family members. If you have a laboratory or genetic report, keep the report itself securely. Our comparison of a paper family health binder and a digital organizer can help you choose where to keep it.

Also protect privacy. Do not post family medical histories in a shared social-media space or distribute sensitive details more widely than necessary. Relatives may be comfortable sharing information for health purposes but not for public discussion.

What family health history cannot tell you

Family history can point to increased risk, but it cannot tell you with certainty whether you will develop a disease. People with a strong family history may never develop the condition, and people with no known family history can still develop it.

Family history also does not replace screening guidelines, clinical assessment, or genetic counseling. It is one input in a larger decision. Our guide to preventive screenings by life stage can help you discuss how family history affects your own screening plan.

Avoid changing medications, ordering direct-to-consumer tests, or skipping recommended screening based solely on your own interpretation of a family tree. If the pattern worries you, bring it to a qualified professional.

A realistic update routine

Use three levels of maintenance.

First, update immediately when meaningful new information appears: a major diagnosis, a clarified diagnosis, a genetic test result, a death with a known cause, or another change likely to matter for care.

Second, review before relevant medical visits. This can take two minutes: ask whether anything changed since the last visit and bring the updated summary.

Third, choose a simple periodic household review if it helps you catch missing information. Once a year around a birthday, family gathering, or annual physical is easy to remember, but treat that as an organizational habit rather than a medical rule.

This combination is more reliable than either extreme: never updating the record, or repeatedly asking relatives for the same information on a rigid schedule.