There are four main types of disease: infectious diseases, deficiency diseases, hereditary diseases (including both genetic and non-genetic hereditary diseases), and physiological diseases. Diseases can also be classified in other ways, such as communicable versus non-communicable diseases.

Jan 22, 2025 · disease, 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 diseased organism commonly exhibits signs or symptoms indicative of its abnormal state.

Easy-to-understand answers about diseases and conditions. Find out what could be causing your symptoms and when to seek care. Search for clinical trials by disease, treatment, or drug name. Share your experiences and find support in our online communities. Mayo Clinic experts solve the world’s toughest medical problems — one patient at a time.

The meaning of DISEASE is a condition of the living animal or plant body or of one of its parts that impairs normal functioning and is typically manifested by distinguishing signs and symptoms : sickness, malady. How to use disease in a sentence.

DISEASE definition: 1. (an) illness of people, animals, plants, etc., caused by infection or a failure of health rather…. Learn more.

Apr 19, 2023 · Read on to see 10 of the deadliest diseases worldwide. 1. Ischemic heart disease, or coronary artery disease. The deadliest disease in the world is coronary artery disease (CAD). Also called...

Infectious diseases are caused by harmful organisms that get into your body from the outside, like viruses and bacteria. Noninfectious diseases aren’t caused by outside organisms, but by genetics, anatomical differences, getting older and the environment you live in.

Jul 22, 2019 · Arthritis is joint inflammation that can cause stiffness or pain. Learn more about the symptoms & treatments. What is atopic dermatitis? It is a skin disease causing much itchiness. Scratching leads to redness, swelling, cracking, weeping clear fluid, crusting, and scaling.

Find diseases and conditions; healthy living; workplace safety; environmental health; injury, violence and safety; global health; travelers’ health and more. MMWR is a weekly epidemiological digest that provides timely, reliable, objective, and useful public health information.

At first sight, the answer to “What is a disease?” is straightforward. Most of us feel we have an intuitive grasp of the idea, reaching mentally to images or memories of colds, cancer or tuberculosis.