Wikipedia describes Writer’s Block as: is a condition, primarily associated with writing as a profession, in which an author loses the ability to produce new work. The condition varies widely in intensity. It can be trivial, a temporary difficulty in dealing with the task at hand. At the other extreme, some "blocked" writers have been unable to work for years on end, and some have even abandoned their careers. It can manifest as the affected writer viewing their work as inferior or unsuitable, when in fact it could be the opposite
In her 2004 book The Midnight Disease: The Drive to Write, Writer's Block, and the Creative Brain, the writer and Alice W. Flaherty has argued that literary creativity is a function of specific areas of the brain, and that block may be the result of brain activity being disrupted in those areas.