Your family's health history can change which checks you need and when. Here's what's worth finding out, who counts, and how to share it with your doctor.
Tell your doctor about any serious or long-term health conditions in your close blood relatives, especially your parents, brothers, sisters and children, along with roughly how old they were when it started. Heart disease, stroke, diabetes, certain cancers and inherited conditions matter most. That information can change which checks your doctor recommends and how early you start them.
Why family history matters
Families share genes, and often habits, diets and environments too. Some conditions run in families because of a single inherited gene change. Many more, like heart disease and type 2 diabetes, come from a mix of many genes plus lifestyle.
Either way, your family history is one of the few risk factors a doctor can't measure with a blood test or a blood pressure cuff. It has to come from you. It's also one of the most useful pieces of information you can bring to a consultation, because it can shift the timing of screening and how closely things are watched.
Who counts as family
For medical purposes, what matters is blood relatives. First-degree relatives, meaning your parents, siblings and children, carry the most weight because you share about half your genes with each of them. Second-degree relatives, such as grandparents, aunts, uncles and half-siblings, are also relevant.
It helps to note which side of the family a condition is on. Two or three relatives on the same side with the same condition, or related conditions, is a stronger signal than scattered cases across both sides.
The conditions worth asking about
You don't need a complete medical record of everyone in your family. Focus on the conditions where family history most often changes what a doctor does.
- Heart disease and stroke, especially a heart attack, stroke or heart procedure at a younger age than usual.
- High cholesterol, particularly if it was very high or found early in life, as some forms are inherited.
- Type 2 diabetes, and diabetes during pregnancy.
- Cancers, including bowel, breast, ovarian, prostate, pancreatic and melanoma. Note the type of cancer, not just "cancer".
- Kidney disease, including inherited kidney conditions.
- Mental health conditions, such as depression, bipolar disorder or suicide in the family.
- Inherited conditions, such as haemochromatosis (iron overload), blood clotting disorders or anything a relative was told was genetic.
- Dementia, especially if it started at a younger age.
- Sudden or unexplained deaths at a young age, which can sometimes point to an inherited heart condition.
Age of onset is the key detail
The age someone was when a condition started is often more important than the condition itself. A grandparent having a heart attack in their late 80s tells your doctor something quite different from a parent having one in their 40s.
As a general rule, conditions that appear earlier than usual in a family are more likely to have a strong inherited element. If you can, find out roughly how old each relative was when they were diagnosed, not just what they had. "Dad had a heart attack at about 50" is far more useful than "heart problems on Dad's side".
How family history can change your checks
A relevant family history can mean your doctor suggests some checks earlier or more often than the general guidance. For example, a strong family history of bowel cancer may mean starting bowel checks earlier than the national screening program age, and a family history of early heart disease may prompt earlier cholesterol and blood pressure checks. Our guide to which health checks to have at 30, 40 and 50 covers the usual starting points.
In some situations, such as several relatives with breast and ovarian cancer, a doctor may suggest referral to a family cancer or genetics service for specialist advice. Family history also helps doctors interpret your results. A borderline cholesterol or blood sugar result means more when the same problem runs in your family, as our article on understanding your blood test results explains.
How to gather it
Family gatherings are a natural time to ask, though some people prefer a phone call or message. Keep it simple. Ask what conditions, which relative, and roughly what age. Write it down and keep it somewhere you can find it, and update it as things change. Health conditions can be sensitive, so it's fine to collect what you can and leave gaps where you need to.
When to talk to a doctor
Raise your family history at your next check-up, and book one sooner if a close relative has recently been diagnosed with heart disease, a cancer or an inherited condition, or if several relatives have had the same condition. Mention it even if you feel perfectly well, because that's when it's most useful. If you have chest pain, trouble breathing or feel faint, call 000.
How UHD BioHealth can help
UHD BioHealth is a doctor-led telehealth service available across Australia. You start with a detailed online questionnaire, and an AHPRA-registered doctor reviews it within 24 hours. Where it's useful, your doctor will recommend bloodwork you can do locally, then you receive a written, personalised plan with every cost listed before you pay anything, checked by a second, independent doctor, with follow-up care along the way. See what a doctor looks at for healthy ageing.
Common questions
Which relatives matter most for family history?
Close blood relatives matter most. That means parents, brothers and sisters, and children. Grandparents, aunts, uncles, nieces and nephews are also useful, especially when several relatives on the same side have had the same condition.
Does a family history mean I'll get the same condition?
No. A family history raises the chance of some conditions, but it isn't a prediction. Many people with a strong family history never develop the condition, and lifestyle, environment and regular checks all play a part.
What if I don't know my family history?
That's common, especially if you're adopted, estranged from family or relatives didn't talk about their health. Tell your doctor what you do and don't know. They can still assess your risk using your own history, measurements and tests.
Planning for the long game
An in-depth health questionnaire covering your history, symptoms, medications and lifestyle, read by an AHPRA-registered doctor within 24 hours. Bloodwork where it's needed, and a written plan before you pay anything.
General health information only, not medical advice. Complete our questionnaire and a doctor will assess whether a consult is right for you. Individual needs and outcomes vary. In an emergency, call 000.
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