The cost of finding out late — and the value of acting early

Picture two people with the same slightly elevated blood-sugar value. One finds it in routine blood tests, talks to their doctor and adjusts diet and movement. The other only finds it years later, when the situation already calls for medication and close follow-up.

The difference between the two paths is rarely luck. Most of the time, it is the moment the information arrived — and what could still be done with it.

Colorectal cancer is one of the best-studied examples: according to the American Cancer Society, based on SEER data, more than 90% of people whose cancer is detected while still localised survive at least 5 years. When detection happens at an advanced stage, that figure is around 15%.

In Portugal, the National Diabetes Observatory estimates that around 13 to 14% of adults aged 20 to 79 live with diabetes — and that a substantial share are still undiagnosed, meaning they do not know.

The pattern repeats with hypertension: according to the WHO, about half of the people with high blood pressure do not know they have it. What is not measured stays unknown.

When a condition is found early, the plan is usually simple: adjust habits, repeat tests, keep watch. Late, the same problem tends to require more appointments, more exams, more medication and more time — yours and the health system's.

There is also a less visible cost: peace of mind. Knowing where you stand, with measured values and a defined follow-up, weighs less than prolonged uncertainty.

The Diabetes Prevention Program (CDC/NIH) showed that, in at-risk people, changing lifestyle reduced the chances of developing type-2 diabetes by 58%. It was not a new drug — it was regular walking and a more balanced diet, with support.

Tobacco is another clear example: according to the WHO, it kills up to half of its long-term users — and the benefits of quitting start accumulating within the first weeks, at any age.

None of this requires dramatic decisions. It only requires that the conversation happens early: general blood tests, the screenings appropriate for your age, a routine appointment with your family doctor.

If it has been a while since your last check-up, that is probably the highest-return step you can take this year. Talk to your doctor — preferably before there is a reason to.