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What is disease?

Everything you need to know about disease.

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According to the World Health Organization, “Disease is any harmful deviation from the normal structural or functional state of an organism, generally associated with certain signs and symptoms and differing in nature from physical injury.”

"A disease is a condition that impairs normal functioning of the body or mind. It can be caused by various factors, including genetic disorders, infections, environmental factors, lifestyle choices, or a combination of these. Diseases can range from minor to severe and can affect one or multiple systems within the body. Some common diseases include heart disease, diabetes, cancer, and infectious diseases such as the flu or COVID-19. The presence of a disease often results in symptoms that can impact an individual's health and quality of life. Treatment for diseases may include medication, therapy, lifestyle changes, or surgery."


To make it simple, disease is the opposite of being healthy, and also means some part of our body may not work. If we have disease, we may feel pains, and some of the numbers in our medical report may not be in the proper range. There are more than 10000 diseases in the world, but for many of them, there is no cure. So, keeping a good health status and prevention of diseases are more important than treating diseases.

There are some common diseases that you can name:

. Allergies: An immune response triggered by allergens, an ordinarily harmful substance. Our immune system is to protect our body from infections and other diseases. However, when people have sensitive immune system, it may overreact to some specific substance, such as foods, pollen, or mold. People with allergies have to avoid those substances or take medication.

. Colds and Flu: Upper respiratory infections caused by a virus. There are many kinds of viruses that can cause colds and flu, and virus are evolving all the time. We primarily rely on our immune system to fight colds and flu.

. Diarrhea: Watery, loose stools, and frequent bowel movements caused by bacterial infection, viral infection, or other sources. We usually have to take medication to cure diarrhea.

. Headaches: There are three types of headaches. A cluster headache affects a specific point of the head with sharp, piercing pain; a “tension-type“ headache is constant and dull ache felt on both sides of the head; the migraine is pulsing or throbbing pain beginning with intense pain on one side of the head and eventually spreads. There are countless causes of headaches, which differ for each person. Most headaches will go by itself. But if it’s very painful, or lasts more than a day, people have to seek treatments.

. Stomach Aches: Intense, temporary pain caused by excessive gas in the digestive tract; or “stomach flu”, an inflammation of the intestines, caused by viruses, parasites, bacteria, food allergies, overuse of alcohol, and psychological reactions. In most cases, people have to seek treatments.

There are some diseases you may not think it’s a disease:

. Toothache: It can become really painful, and could turn into something serious or even life-threatening.

. Obesity: it’s actually a complex disease involving an excessive amount of body fat. It's also a medical problem that increases the risk of other diseases and health problems, such as heart disease, diabetes, high blood pressure and certain cancers.

. Boredom: There are no tests to diagnose boredom, and it usually doesn’t hurt. But boredom that lasts for long periods of time, or occurs frequently, may be a sign of depression.

. Aging (getting older): Aging is caused by both genetic and lifestyle issues in our life. The ideal normal human life should be 150 years old. Even the Greenland shark can live 272+ years. Effective treatment of aging is state of the art medical research in the current world.

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