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 …

4 days ago · 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, …

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

Learn more about health from Cleveland Clinic experts. An alphabetic listing covers medical conditions, testing, diagnosis, treatment and ongoing care.

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, …

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Oct 17, 2025 · Classifications of diseases become extremely important in the compilation of statistics on causes of illness (morbidity) and causes of death (mortality). It is obviously important to know what …