Medical phenomena

thumb|300px|Diagram featuring stages of tissue healing Regarding physical trauma or disease suffered by an organism, healing involves the repairing of damaged tissue(s), organs and the biological system as a whole and resumption of (normal) functioning. Medicine includes the process by which the cells in the body regenerate and repair to reduce the size of a damaged or necrotic area and replace it with new living tissue. The replacement can happen in two ways: by regeneration in which the necrotic cells are replaced by new cells that form "like" tissue as was originally there; or by repair in

thumb|A convalescent woman. Photo by Paolo Monti. thumb|Religious melancholia and convalescence Convalescence is the gradual recovery of health and strength after illness or injury.