Must Know Facts

Chest pain or pressure, sudden weakness or difficulty speaking, severe breathlessness, unexplained fainting or loss of consciousness, and significant bleeding should never be casually watched at home. These symptoms may signal time-sensitive heart, brain, lung or circulatory problems. Seek prompt medical assessment, especially when the symptom is sudden, severe, new, or worsening.

High blood pressure often causes no warning symptoms, so headache or dizziness cannot be used to judge whether BP is high. A normal reading while taking medicines usually means treatment is working—not that hypertension has disappeared. Diagnosis and treatment decisions should be based on correctly measured, repeated readings and the person's overall cardiovascular risk.

A useful annual health review is not simply a large package of blood tests. What matters most is an individualized review of blood pressure, weight and waist, diabetes and cholesterol risk, smoking and alcohol use, exercise, sleep, vaccination status, family history, medicines, and age-appropriate cancer screening. Tests should be chosen according to risk rather than ordered indiscriminately.

After 40, I would pay particular attention to cardiovascular and metabolic risk: blood pressure, blood glucose or HbA1c when appropriate, lipid profile, weight/waist and kidney risk assessment. Screening for cancers and other conditions should then be added according to age, sex, family history and individual risk. The goal is early risk detection, not simply collecting normal reports.

Viruses and bacteria are different causes of infection, but their symptoms can overlap considerably. Colds, influenza and many sore throats are viral and do not improve with antibiotics. Bacterial infections may require antibiotics, but mucus colour or the height of fever alone cannot reliably tell the difference; examination and selected tests may be needed.

Persistent tiredness can occur even when a basic blood panel is normal. Common contributors include insufficient or poor-quality sleep, stress, anxiety, inadequate nutrition, dehydration, physical inactivity, overwork and medication effects; sometimes thyroid disease, anaemia, sleep apnoea or other conditions need targeted evaluation. The next step is usually a careful history and examination—not repeatedly ordering every possible test.

The biggest mistake is treating antibiotics as general-purpose medicines for fever, cough or sore throat. Antibiotics do not treat viruses, and unnecessary use can cause diarrhoea, allergy and antimicrobial resistance. Avoid self-prescribing, sharing antibiotics, using leftovers or changing the prescribed drug or duration without medical advice.

Chest pain is especially concerning when it feels like pressure, heaviness, squeezing or tightness and is associated with sweating, breathlessness, nausea, faintness, or pain spreading to the arm, shoulder, jaw or back. New unexplained chest discomfort—particularly during exertion or in someone with diabetes, hypertension or other cardiovascular risks—deserves prompt assessment. Severe or ongoing symptoms require emergency evaluation.

Prediabetes means blood glucose is above the normal range but has not yet reached the diabetes threshold. It is an important warning because progression is not inevitable: regular physical activity, weight reduction when appropriate, better food quality, adequate sleep and follow-up can substantially lower risk. It is also a good time to address blood pressure, cholesterol and smoking.

A lipid profile contains several numbers with different meanings. LDL cholesterol is a major treatment target because higher levels contribute to atherosclerotic cardiovascular disease; triglycerides and HDL provide additional information. The 'right' LDL is not the same for everyone—someone with established heart disease, diabetes or very high risk may need a much lower target than a low-risk young adult.

Fatty liver is frequently discovered incidentally and may cause no pain or symptoms. It often accompanies excess abdominal weight, diabetes, high triglycerides and other metabolic risks. Many people remain stable, but some develop liver inflammation and fibrosis, so the important questions are not only 'Is there fat?' but also 'Why is it present?' and 'Is there evidence of liver damage or fibrosis?'.

A creatinine result within the laboratory reference range does not always guarantee completely healthy kidneys. Creatinine is influenced by muscle mass, age and other factors, so estimated GFR (eGFR), urine albumin-to-creatinine ratio and trends over time can provide important additional information. This is particularly relevant in people with diabetes, hypertension or other kidney risks.

Vitamin D and B12 tests are useful when symptoms or risk factors make deficiency plausible—for example restricted diets, malabsorption, certain medicines, bone disease, anaemia or neurological symptoms. They do not need to be repeatedly checked in every healthy person without a reason. Testing should answer a clinical question and treatment should be based on the result plus the patient's context.

Frequent painkiller use is not harmless simply because some medicines are available without prescription. NSAIDs such as ibuprofen or diclofenac can contribute to gastritis, gastrointestinal bleeding, kidney injury, fluid retention and worsening blood pressure in susceptible people. Excessive use of some headache medicines can also cause medication-overuse headache. Recurrent pain deserves evaluation of its cause rather than indefinite self-medication.

Seek prompt medical attention for a sudden 'worst headache of life', a new headache with weakness, numbness, speech or vision changes, seizure, confusion, fever with neck stiffness, or headache after significant head injury. A new severe headache during pregnancy or after delivery also needs assessment. A changing headache pattern or a new headache later in life should not simply be assumed to be migraine.

Many short viral fevers improve with rest, fluids and observation, but waiting at home becomes unsafe when fever is persistent or accompanied by breathing difficulty, confusion, severe weakness, dehydration, repeated vomiting, bleeding, seizure, severe headache, reduced urine output or rapidly worsening illness. Infants, older adults, pregnant patients and people with significant comorbidity may need earlier assessment.

There is no single perfect number of litres of water for every adult. Needs vary with body size, weather, physical activity, fever, pregnancy, diet and fluid losses. Thirst and urine colour are useful everyday guides for many healthy people, but deliberately forcing very large volumes is unnecessary and can be harmful. People with heart, kidney or liver disease may need individualized fluid advice.

Sleep is an active part of health, not merely time when nothing is happening. Chronic sleep deprivation can affect concentration, mood, appetite, blood pressure, glucose regulation and cardiovascular health. Most adults benefit from regular sleep timing and sufficient duration; loud snoring, witnessed breathing pauses or marked daytime sleepiness should raise the possibility of sleep apnoea.

Family history can reveal inherited or shared risk that is not obvious from how healthy you currently feel. Heart attacks or strokes at young ages, diabetes, hypertension and certain cancers in close relatives can influence when screening and prevention should begin. When discussing family history, the relative's condition and the age at which it occurred are particularly useful details.

Rather than chasing dozens of numbers, adults should understand a small set of meaningful health measures: blood pressure, body weight/BMI and preferably waist circumference, blood glucose or HbA1c when indicated, LDL cholesterol, kidney function such as eGFR, and resting pulse. Depending on the individual, other measures may matter more. Trends over time and overall risk are more informative than one isolated 'perfect' value.