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 …

Oct 30, 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 …

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

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.

Jun 1, 2025 · At first glance, the answer seems deceptively simple: disease is the presence of illness, of something going wrong within the body. But the deeper we probe into this question—scientifically, …

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 : …

Mar 7, 2025 · What’s the definition of a disease? A disease is a disorder that interferes with your body’s normal functions. “Typically, a disease is something that your physician diagnoses, using a …

PCD is a peer reviewed journal covering research, public health findings, innovations, and practices on chronic diseases.

Dec 1, 2025 · It is believed to accelerate aging and contribute to more than half of all deaths worldwide by driving various age-related diseases such as arthritis, autoimmune conditions, heart disease, …

Note: illness is sometimes used as a synonym of disease, but it also refers to a person's perception of their health, regardless of whether the person does or does not have a disease.