Is the betrothed required to inform her fiancé of the problem of irregular menstrual cycles and excessive hair growth? And is not informing him considered deception on her part?

The suitor is not required to be informed of certain matters that are not among the defects that must be mentioned, such as the matters mentioned in the question. Concealing them does not constitute deception or fraud. The most important qualities to consider in a prospective wife are religiosity and character.