A useful family health history records close blood relatives on both sides of your family, the serious or chronic conditions they have had, the age each condition began or was diagnosed, and—when someone has died—their age and cause of death. Add cancer type, family ancestry, and clear labels for anything unknown. An incomplete record is still worth taking to a healthcare professional.
Why a family health history matters
Your family health history gives a clinician context that cannot be found in your own medical chart. Patterns of heart disease, diabetes, high blood pressure, high cholesterol, cancer, stroke, and other serious conditions can help a healthcare provider decide which screening tests or other interventions may be appropriate and when. The information is about risk, not certainty: having a relative with a disease does not mean you will develop it.
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The Centers for Disease Control and Prevention (CDC) gives a practical example: a mother diagnosed with breast cancer before age 50 could lead a provider to consider a referral for genetic counseling. That decision depends on the complete family pattern and your circumstances. Use the record to start a conversation with a clinician, not to diagnose yourself or assume that a condition is inevitable.
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Whom to include
Build the history from both sides of the family rather than stopping with your parents and siblings. CDC adult guidance identifies these relatives as useful starting points:
- Parents
- Full siblings, half-siblings, and children
- Grandparents
- Aunts and uncles
- Nieces and nephews
For each person, identify the relationship and whether the person is on your maternal or paternal side. “Aunt” alone is ambiguous if your family has relatives by marriage; the side and biological relationship help a clinician understand how a condition may be connected. For cancer information specifically, CDC guidance refers to relatives related by blood. Non-blood relatives can be important to your family story, but do not mix their conditions into a biological cancer pattern.
If you are adopted or were conceived with donor assistance, you may not have access to biological family information. Do not fill those fields with assumptions. Tell your provider what is unavailable and ask what records, genetic services, or other options apply to your situation.
The details to record for every relative
Use one entry per relative and capture the same core fields consistently. An approximate age is useful when an exact age is not remembered.
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| Field | What to write | Example or handling rule |
|---|---|---|
| Identity and relationship | Name or a clear identifier, relationship, and maternal or paternal side | “Maternal grandfather” or “paternal half-sister” |
| Living status | Living, deceased, or unknown | Use “unknown” rather than inferring status |
| Major condition | The serious or chronic disease reported | Heart disease, diabetes, high blood pressure, high cholesterol, cancer, or stroke |
| Specific diagnosis or type | The precise diagnosis when the family knows it | For cancer, record the specific cancer type |
| Age at onset or diagnosis | Age when the condition began or was diagnosed | Write an estimate if the exact age is unavailable |
| Death information | Age at death and cause of death, when known | Keep an unconfirmed family story labeled as uncertain |
| Ancestry | Family ethnic background and countries of origin | Record what relatives report; do not guess from appearance or surname |
| Confidence or source | Who supplied the information and whether it is confirmed | “Aunt reports,” “medical record,” or “uncertain” |
Conditions and diagnoses
Ask about chronic diseases as well as events relatives may describe casually as “a scare” or “a problem.” Record the diagnosis if anyone knows it, not just a symptom. For example, distinguish a confirmed stroke from a vague report that someone “had trouble speaking.” Include high blood pressure and high cholesterol even when a relative considers them routine, because they are part of the risk information a clinician may review.
Cancer information
“Cancer” is not a complete entry. Ask which organ or tissue was affected and record the specific type whenever possible. If a family member had more than one cancer, list each one separately with its age at diagnosis. If the type cannot be established, write “cancer type unknown” rather than selecting the most likely type.
Age at onset or diagnosis
Age changes how a clinician interprets a family pattern. Ask when the condition started and when it was diagnosed; those can be different dates. If a relative cannot remember the exact age, record an estimate such as “about 50” and identify it as approximate. Never turn a rough recollection into a precise number.
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For a deceased relative, add age at death and cause of death when known. A death certificate or medical record may be more reliable than a long-standing family explanation. If the cause is disputed or unconfirmed, preserve that uncertainty in the entry. “Unknown” is a valid and more useful field value than a confident guess.
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Ancestry and ethnic background
Ask about the family’s ancestry and the countries from which ancestors came to the United States. Include information from both sides. Record how the information was learned and leave it open to correction; family identity labels and country names can change as relatives find better records.
How to gather the information
Start with relatives who are likely to know details, then verify important points when records are available. Talk with family members on both sides, including older relatives who may remember diagnoses and ages that younger family members have not heard. Ask one condition at a time and write down the wording they use before translating it into a medical term.
- Make a relative list. Write the parents, siblings, half-siblings, grandparents, aunts, uncles, nieces, nephews, and children you know, and mark the maternal or paternal side.
- Contact relatives from both sides. Explain that you are collecting health information for a medical appointment, not judging anyone’s choices. A short call or shared written questionnaire can be easier than trying to reconstruct the history later.
- Ask about chronic and serious conditions. Cover heart disease, diabetes, high blood pressure, high cholesterol, cancer, stroke, and any other major diagnosis the relative mentions.
- Capture type and timing. For each condition, ask the specific diagnosis and the age when it began or was diagnosed. Write “approximately” when necessary.
- Follow up on cancer. Ask what type of cancer it was and whether the relative had more than one cancer.
- Document deceased relatives. Ask the age and cause of death. If appropriate and available, consult family medical records or death certificates.
- Ask about ancestry. Record ethnic background and the countries relatives identify as ancestral homes.
- Label gaps. Use “unknown,” “not sure,” or “family report—unconfirmed.” Do not fill a blank with a presumed diagnosis or cause of death.
Questions you can use verbatim
Specific prompts produce more useful answers than “Is there anything important in the family?” CDC’s adult guidance offers these questions:
- “Do you have any chronic diseases, such as heart disease or diabetes?”
- “Have you had any other serious diseases, such as cancer or stroke? What type of cancer?”
- “How old were you when you found out you had each of these diseases and health conditions?”
- “What were the cause and age of death for relatives who have died?”
- “What is our family’s ancestry? From what countries did our ancestors come to the United States?”
When someone gives an uncertain answer, ask a neutral follow-up: “Do you remember approximately how old they were?” or “Is that what the medical record said, or what the family was told?” This keeps an estimate or family story from becoming a falsely confirmed fact.
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Choose a format you can maintain
CDC identifies the Surgeon General’s free web-based My Family Health Portrait as a way to organize the information and share it with family and a healthcare provider. A paper notebook or family medical-history organizer is another practical option if relatives prefer writing or do not use the same online service. The available evidence does not establish that one format is clinically superior; the best choice is the one your family can access, update, and bring to an appointment.
Whichever format you use, keep the fields consistent. A simple entry can contain:
Relative and side: ______________________________
Living status: __________________________________
Condition and specific diagnosis: _______________
Age at onset or diagnosis: ______________________
Cancer type (if applicable): ____________________
Age and cause of death (if deceased): ___________
Ancestry or ethnic background: __________________
Source and certainty: ___________________________Do not create separate, conflicting versions for each family member. Share a single current copy, or clearly date each revision so a clinician can tell which information is newest.
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How to use the record at a healthcare visit
Bring the record, including its unknowns, to your primary-care or other healthcare appointment. Tell the clinician which entries are confirmed and which are estimates or family reports. The provider may ask follow-up questions, recommend a screening schedule, or discuss genetic counseling based on the pattern, the ages involved, and your personal history.
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For example, an early breast-cancer diagnosis in a close blood relative may prompt a discussion of genetic counseling. That is a clinical assessment, not a conclusion that you carry a particular genetic change. Your clinician may also decide that a reported condition is not sufficiently specific to change care until it can be verified.
Do not use the checklist to start or stop screening, medication, or testing on your own. Family history is one part of a medical assessment, alongside your age, symptoms, personal diagnoses, and other factors.
Update the history when facts change
A family history is a living record. Add a new diagnosis, a newly learned cancer type, a corrected age, a death, or newly documented ancestry when you learn it. Revisit the record before routine health visits and after major family events so the information you share is current.
Keep the distinction between “not yet known” and “does not exist.” A relative may simply not remember the age at diagnosis, and a death certificate may not be available. Mark the gap and return to it if a reliable source becomes accessible. An incomplete history remains useful when its limits are visible.
Quick Recap
Common mistakes to avoid
- Recording only parents and siblings: grandparents, aunts, uncles, half-siblings, nieces, nephews, and children can add important context.
- Writing “cancer” without a type: ask which cancer was diagnosed and list multiple cancers separately.
- Leaving out age: approximate onset or diagnosis age is better than no timing at all.
- Confusing symptoms with diagnoses: preserve the relative’s wording and mark an unverified interpretation as uncertain.
- Guessing a cause of death: record it only as confirmed when the family knows it reliably.
- Mixing non-blood relatives into a biological cancer pattern: identify relationships clearly and follow your clinician’s guidance for adopted or donor-conceived history.
- Waiting for a perfect record: share what is known now and add details later.
- Treating risk as destiny: a family pattern can guide screening discussions but cannot predict an individual outcome by itself.
A concise pre-appointment checklist
- Have I included relatives on both the maternal and paternal sides?
- Have I identified half-siblings and other relationships clearly?
- For each major condition, do I have the diagnosis and age at onset or diagnosis?
- For every cancer entry, do I know the type—or have I marked it unknown?
- For deceased relatives, have I recorded age and cause of death when known?
- Have I asked about ancestry and ethnic background?
- Have I labeled estimates, family stories, and missing information?
- Is the record in a format I can update and share with my healthcare provider?
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