Gender role is the idea that people should behave in certain ways because of their gender.As an example, in a hunter-gatherer economy, men usually do more hunting and women do more gathering.

Gender identity refers to a personal identification with a particular gender and gender role in society. The term woman has historically been used interchangeably with reference to the female body, though more recently this usage has been viewed as controversial by some feminists.

A migraine is a medical condition which usually causes a pounding, throbbing headache on one side of the head. The pain may be very bad and hurt so much that a person may have a hard time doing anything.

Age of formation. There are several theories about how and when gender identity forms, and studying the subject is difficult because children's lack of language requires researchers to make assumptions from indirect evidence.