Medicine and Healthcare

Medicine is the science and practice concerned with maintaining health and with diagnosing, treating and preventing disease. Healthcare is the broader system of services and professionals — doctors, nurses, pharmacists and many others — that delivers this care. Together they draw on biology, chemistry and the study of the human body to understand how illness arises and how it can be managed or avoided.

Disease can affect any of the body's organ systems, and medicine is often organised around them. Cardiovascular medicine deals with the heart and blood vessels, including conditions such as high blood pressure and heart failure; endocrinology covers hormonal disorders; and neurological medicine addresses the brain and nerves. Respiratory medicine treats the lungs and airways. Some illnesses are caused by infection with bacteria, viruses or other microbes, while others, such as raised cholesterol or osteoporosis, develop from metabolic, genetic or lifestyle factors over time.

Modern healthcare places strong emphasis on prevention as well as treatment. Vaccines train the immune system to recognise specific pathogens, reducing the spread of infectious diseases such as influenza, while antibiotics treat bacterial infections once they occur. Public health measures address risks linked to diet, alcohol and other substances. Reliable medical information helps people understand symptoms, treatments and the importance of professional advice, though it cannot replace consultation with a qualified clinician.

Frequently asked questions

What is the difference between a virus and a bacterium?

Bacteria are single-celled living organisms that can often be treated with antibiotics, while viruses are much smaller infectious agents that replicate inside host cells and do not respond to antibiotics.

How do vaccines work?

Vaccines expose the immune system to a harmless form or part of a pathogen, prompting it to build defences so the body can respond quickly if it later meets the real organism.

What does a cardiovascular disease affect?

Cardiovascular diseases affect the heart and blood vessels, and include conditions such as high blood pressure, coronary artery disease and heart failure.