It's All in Your Head is a nonfiction book by neurologist Suzanne O'Sullivan, in which she shares her past experiences in diagnosing patients with psychosomatic disorders.

[4] The title of the book was created in an ironic sense since patients with psychosomatic illnesses cannot stand being told by medical professionals that their symptoms are all in their head, which gives the impression that it is not real.

[5] In this book, O’Sullivan recounts her most memorable interactions of patients with severe physical symptoms that she found to come from their mental state in a total of twelve chapters.

[6] The culture of medicine has caused medical professionals to become insensitive to a patient's mental health and dismiss their physical symptoms by claiming it's all in their head.

The book discusses the difficulty of diagnosing those with psychosomatic illnesses since most doctors direct their focus on the physical symptoms and test results.