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 …

Explore comprehensive guides on hundreds of common and rare diseases and conditions from the experts at Mayo Clinic.

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 : …

Dec 12, 2025 · disease, any harmful deviation from the healthy structural or functional state of an organism, generally associated with certain signs and symptoms and differing in nature from physical …

Jun 1, 2025 · Disease is not just a collection of symptoms, pathogens, or malfunctions. It’s a dynamic state—a disruption of the delicate balance that defines life. To understand disease, we must first …

Jun 5, 2025 · Osteoporosis is a bone disease that develops when the bones get weaker and less dense. When a child or teen develops osteoporosis, the condition is known as juvenile osteoporosis.

A to Z list of common illnesses and conditions including their symptoms, causes and treatments.

See a healthcare provider if you have symptoms of an infectious disease, especially if they don’t get better within a week or two. If you have an ongoing infection, frequent follow-ups with your provider …

Nov 19, 2025 · Learn how to differentiate diseases and disorders from syndromes and conditions to better understand your health and clarify a medical diagnosis.

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