Month: December 2024

Cancer is a disease that happens when the cells that make up your tissues and organs start to grow and divide without control. Cancer can be deadly, because it can spread to other parts of the body and destroy healthy tissue. But scientists still don’t know exactly what causes most types of cancer. They do know that some people are more likely to get cancer than others. That’s partly because genes influence how your body works. But also because of things you do, such as smoking and being exposed to chemicals called carcinogens. There are more than 100 different kinds of cancer. But all cancers start when your body’s cells begin to grow and multiply out of control. The abnormal cells can become a lump or tumor, which is a group of cells that has accumulated too much tissue and lost their ability to stop growing and dividing. The resulting tumour is often shaped like the part of your body that it is in. Sometimes, these cells can break away and move to other parts of your body. These new tumours are called secondary or metastatic cancers. They can be less serious than the cancer that started in the place where it first developed, which is called the primary tumour. Cells in multicellular organisms, including mammals and humans, have a built-in limit on how many times they can divide. After a certain number of divisions, most cells die and are replaced by new cells that have the same genetic characteristics as the original cells. But, if one of your body’s cells develops a mutation that prevents it from dying or stopping its growth and proliferation, the abnormal cell can continue dividing. The result can be a tumour that forms in the place where it started, or it can spread to other places in your body. Most cancers develop from changes (mutations) in your DNA. These mutations can happen by chance when your cells are dividing, or they can be caused by something you do, such as smoking or exposure to chemicals, or by things in the environment that can damage DNA, such as viruses or radiation. Sometimes, these mutations can also be inherited. Then, if these mutations are not blocked by your immune system or other normal controls, they can accumulate and continue to reproduce. The resulting population of cancer cells evolves through natural selection, just as individual organisms do in their environment, to develop adaptations that allow them to survive and thrive in the tumor microenvironment. These adaptations may include increased uptake of nutrients, evasion of the immune system or recruitment of other cancer cells to help them grow. There are ways to lower your risk of getting cancer, such as eating a balanced diet and staying physically active. Keeping weight in a healthy range, not smoking and using sunscreen can also help reduce your risk of cancer. In addition, it is important to have regular checkups to identify and treat problems before they become cancer.

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Medical is the area of health care concerned with diagnosis, treatment, cure and prevention of disease, injury, and other bodily malfunction. Medical science consists of a broad range of disciplines including biology (the study of living things), chemistry, physics and mathematica. Medical practitioners use their knowledge of the scientific basis of medicine together with clinical skills acquired through practical training to heal patients and improve their quality of life. In its earliest forms, medicine was an art (an area of creative skill and application based on beliefs, superstitions or faith), with connections to religious and philosophical belief systems (such as the ancient practice of bloodletting). Modern medicine is a combination of both art and science. For example, the skill in stitching a wound requires art, but the understanding of what is taking place at the cellular and molecular level arises from science. The basic sciences include anatomy (the study of the physical structure of organisms), cytology (the study of cells), embryology (the study of early development) and endocrinology (the study of hormones). Biochemistry is the study of chemical processes in living organisms, while physiology is the study of how organs function normally. Pathology is the study of disease – its causes, course, progression and resolution. Pharmacology is the study of drugs, and radiation physics includes photobiology (the interaction between non-ionizing and ionizing radiation with living tissue) and radiobiology (the interactions between ionizing and non-ionizing radiation with living tissue). Epidemiology is the study of disease in populations, and biostatistics is the application of statistics to biological fields. Medical ethics are the principles of morality and judgment applied to medical practice. Medical education is the process of preparing and training medical professionals, including doctors and nurses. Modern tertiary care hospitals are equipped with facilities for the investigation and treatment of complex and serious diseases, and the delivery of medical services is increasingly dependent on information technology based on computerised data recording and analysis. Many highly trained health care professionals besides doctors are involved in the delivery of modern medical services, such as nurses, emergency medical technicians and paramedics, laboratory scientists, pharmacists, dietitians, occupational therapists, speech therapists, respiratory therapists, physiotherapists, medical physicists, biomedical engineers and radiographers. Most medical specialities fit into one of two broad categories: “Medicine” or “Surgery”. Medicine subspecialties typically require preliminary training in Internal Medicine and successful completion of the Membership Examination of the Royal Colleges of Physicians (MRCP in England). Surgery subspecialties generally require an additional qualification from a surgical board. Exceptions include gynecology, which is a medical specialty in its own right, and toxicology, which does not. Other specialist areas of medicine include conservation medicine, which is concerned with the relationship between human and non-human animal health and environmental conditions; forensic medicine, which investigates questions of criminal law; and diving medicine, which examines medical problems related to scuba diving. Each of these has its own professional body or college.

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Health refers to the state of being physically, emotionally and socially well, free of disease or injury. It is a concept with a rich history, reflecting the changing perspectives of society and science. The definition of Health is a subject of debate among many disciplines, including biomedical sciences, public health, psychology, sociology, statistics and epidemiology, economics, and education. The traditional medical model of Health focuses on the diagnosis and treatment of disease or injury and is the basis for much of the funding and delivery of health services, particularly in developed countries. In this model, individuals are seen as responsible for their own health and therefore have the power to modify risk behaviors through personal choices (such as not smoking) and to access preventive and curative health care. There are many diseases and disorders that can afflict the human body, ranging from colds to cancers. People can also be affected by conditions that are not diseases but rather impairments of the ability to function, such as chronic musculoskeletal pain or depression. Some people may experience multiple conditions at the same time, a phenomenon known as multimorbidity. A person’s level of Health depends not only on the presence or absence of disease, but also on how he or she lives his or her life and the context in which he or she functions. This perspective on Health was articulated by the French physician Georges Canguilhem in his 1943 book, The Normal and the Pathological. Canguilhem’s definition of Health as “the ability to adapt to one’s prevailing conditions” shifts the focus away from an emphasis on individual responsibility and the role of the doctor to a focus on enabling people to meet their own health needs. The current field model of Health emphasizes the need to address a wide range of factors that influence health and that are sometimes referred to as risk or protective factors. These determinants of health are related to the circumstances in which a person lives, works and plays. They include general economic and environmental conditions; cultural factors; and the behavioral responses of individuals to these influences. Some of these determinants are within the control of individuals and others are not, such as genetic disorders. The health of a population is dependent on the overall quality of life and the health of its members. This is why it is important to consider the overall quality of life and how to improve it through policy and community action. Health features should be free of opinion, bias and personal agenda. They should present scientifically sound research, be accessible and understandable to a non-scientific audience and avoid the use of technical terms that are unfamiliar to readers. It is a challenge to find health topics that are new and exciting, while at the same time not deviate too far from a mainstream approach. Choosing the right topic is an art, and the best writers are able to balance a variety of criteria.

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