the executive power of the federal government is vested in the president. the president has the power to appoint ambassadors, members of the Cabinet, Justices of the Supreme Court and Judges of the lower Federal Courts.
Image: Film Magic/Film Magic/Getty. Stress is the most common cause of irregular periods. Cortisol, the stress hormone, has a direct impact on how much estrogen and progesterone, two sex hormones, gets produced by the body. If you have too much cortisol in your bloodstream, the time and flow of your cycle could change.
This psychological effect can be so powerful that she may stop having her periods. - Hormonal conditions: Hormonal disorders could be a cause for periods not appearing at regular intervals. And finally, one of the major causes of missed periods could be the presence of ovarian cysts. A condition called the Polycystic Ovary Syndrome leads to the development of the cyst in the ovaries.