The honest answer is that it depends — on your age, your family history, and what you are actually trying to find out. But “it depends” is not much use on its own, so here is how doctors think about it.
What a check-up is actually for
A routine health check is not a search for everything at once. It is a targeted look for the specific conditions that are common enough to be worth looking for, serious enough to matter, and treatable enough that finding them early changes the outcome.
That third criterion does more work than people expect. Screening for something that cannot be usefully acted upon generates anxiety without benefit. Good preventive medicine is disciplined about what it looks for and why.
The conditions that generally meet all three criteria in adults are cardiovascular risk factors — blood pressure, cholesterol, blood sugar — and, at certain ages, specific cancers with established screening programmes.
The rough intervals
For an adult with no symptoms, no significant family history and no existing diagnosis, a general health assessment every one to two years is a reasonable default. Your doctor may recommend more or less frequently based on what they find.
Blood pressure is worth checking more often than that, because it is quick, free of downside, and completely symptomless until it is not. Anyone with a previously raised reading should be checking considerably more often, at whatever interval their doctor sets.
If you have an existing condition — diabetes, hypertension, a thyroid disorder — the interval is set by that condition rather than by general screening advice, and your doctor will tell you what it should be.
What shifts the answer
Family history. A first-degree relative with heart disease, diabetes or certain cancers changes both what is screened for and when it starts. This is worth raising even if nobody has asked you.
Age. Several screening programmes begin at specific ages regardless of symptoms. Your doctor will tell you which apply to you.
Symptoms. A symptom is not a screening question. If something is wrong, that is a consultation, not a check-up — and it should not wait for the next scheduled one.
Life stage. Pregnancy, planning a pregnancy, and menopause all come with their own assessments that sit outside general screening.
Making the appointment worth it
A check-up produces better information when you arrive prepared. Know your family history in broad terms. Bring a list of anything you take regularly, including supplements. Note anything you have been meaning to mention but have not considered important enough for its own appointment — that category contains a surprising number of useful findings.
Ask what the results mean rather than only whether they are normal. A result at the upper end of the normal range with a trend in the wrong direction is more actionable than a single reading in isolation, and it is the kind of thing worth discussing.
A note on health packages
Bundled health packages can be an efficient way to get a set of assessments done in one visit. They are worth choosing on the basis of what you actually need rather than the number of tests included — more tests is not the same as a better assessment, and unnecessary testing has its own costs.
If you are unsure which is appropriate, a general medicine consultation first will tell you what is worth checking in your specific case.