Feeling healthy is a good sign, but it does not always mean everything is working as it should. High blood pressure, elevated blood sugar, early liver disease and some cancers can develop without noticeable symptoms. Many people visit a doctor only when something feels wrong, missing an opportunity to identify potential problems earlier. Regular health screening can help close this gap, provided the tests match a person’s age, medical history and risk factors.When the body gives no warning signs“Feeling healthy does not always mean that everything inside the body is healthy,” said Dr Shallini Mittal, Clinical Director and HOD of Diagnostic Radiology at Marengo Asia Hospitals, Gurugram.Some conditions progress quietly for months or years. A person may continue working, exercising and following a normal routine without realising that a health problem is developing. High blood pressure, for instance, often has no obvious symptoms. Screening can identify such changes before they lead to serious complications.Why finding a disease early can matter“For any disease time is the key. Early detection means early treatment and better prognosis,” Dr Mittal explained.Screening may detect certain diseases before symptoms appear, giving doctors an opportunity to assess them and begin treatment when appropriate. Mammography can identify suspicious breast changes, while blood tests can help detect diabetes or abnormal cholesterol levels. However, early detection does not guarantee a cure or always make treatment simpler. The benefit depends on the disease and the screening method.The right tests depend on age and riskThere is no single screening package suitable for everyone. Blood pressure, blood sugar and cholesterol checks become particularly important with increasing age and certain lifestyle risks. Breast and cervical cancer screening should follow applicable guidelines, while colorectal cancer screening should be discussed as people approach middle age.“Screening is not about undergoing every possible test. It is about doing the right test at the right age and at the right interval,” said Dr Vishvak Chanthar K.M.M., Chief of Breast Surgical Oncology Unit-II, Department of Surgical Oncology, Rajiv Gandhi Cancer Institute and Research Centre, New Delhi.A strong family history, existing medical conditions and personal risk factors may change when screening should begin.A health check-up is more than a list of testsA preventive visit also gives people time to discuss sleep, exercise, food habits, stress, vaccinations and medicines. These conversations can reveal risks that a routine blood report may not capture.The US Centers for Disease Control and Prevention’s guidance on preventive care highlights the importance of preventive measures in reducing the burden of chronic diseases. In practice, screening works best alongside healthy daily habits and regular medical advice.Why more tests do not always mean better careScreening has limits. Some tests produce false-positive results, suggesting a possible problem when no disease is present. This can lead to anxiety, repeat investigations and unnecessary procedures. Other tests may miss a disease or detect abnormalities that would never have caused harm.That is why screening should be evidence-based rather than driven by fear. A doctor can help decide which tests are useful, how often they are needed and whether any follow-up is necessary. Feeling fine is reassuring. The aim of screening is to make that reassurance more informed, not to turn every healthy day into a search for disease.Medical experts consultedThis article includes expert inputs shared with TOI Health by:Dr Vishvak Chanthar K.M.M. Chief of Breast Surgical Oncology Unit-II, Department of Surgical Oncology, RGCIRC (Rajiv Gandhi Cancer Institute and Research Centre, New Delhi).Dr Shallini Mittal, Clinical Director & HOD Diagnostic Radiology, Marengo Asia Hospitals, Gurugram.Inputs were used to explain why regular health screening matters even when a person feels completely healthy, highlighting the importance of early disease detection, age-appropriate tests and consulting a doctor to understand individual screening needs.

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