Reason (argument)

Reason (argument)

A reason is a consideration which justifies or explains.

Reasons are what people appeal to when making arguments about what people should do or believe. (Those are reasons in the normative sense.) For example, the fact that a doctor's patient is grimacing is a reason to believe the patient is in pain. The fact that the patient is in pain is a reason for the doctor to do things to alleviate the pain.

In another sense of the term, reasons are explanations of why things happened. (These are reasons in the explanatory sense.) For example, the reason why the patient is in pain is that her nerves are sending signals from her tissues to her brain.