Accidental may refer to:

Accidental (music), a symbol which changes the pitch of a note
Accidental (album), by Fred Frith
Accidental (biology), a biological phenomenon more commonly known as vagrancy
The Accidental, a 2005 novel by Ali Smith
The Accidental (band), a UK folk band
Accidental property, a philosophical term

See also
Accidence (or inflection), a modification of a word to express different grammatical categories
Accident (disambiguation)
Adventitious, which is closely related to "accidental" as used in philosophy and in biology
Random, which often is used incorrectly where accidental or adventitious would be appropriate
While there has been speculation about a connection between early-onset male pattern hair loss and heart disease, a review of articles from 1954 to 1999 found no conclusive connection between baldness and coronary artery disease. The dermatologists who conducted the review suggested further study was needed.Environmental factors are under review. A 2007 study indicated that smoking may be a factor associated with age-related hair loss among Asian men. The study controlled for age and family history, and found statistically significant positive associations between moderate or severe male pattern hair loss and smoking status.Vertex baldness is associated with an increased risk of coronary heart disease (CHD) and the relationship depends upon the severity of baldness, while frontal baldness is not. Thus, vertex baldness might be a marker of CHD and is more closely associated with atherosclerosis than frontal baldness. Hair follicle aging
A key aspect of hair loss with age is the aging of the hair follicle. Ordinarily, hair follicle renewal is maintained by the stem cells associated with each follicle. Aging of the hair follicle appears to be primed by a sustained cellular response to the DNA damage that accumulates in renewing stem cells during aging. This damage response involves the proteolysis of type XVII collagen by neutrophil elastase in response to DNA damage in hair follicle stem cells. Proteolysis of collagen leads to elimination of the damaged cells and,  consequently, to terminal hair follicle miniaturization.