<prompt> Most common cause of secondary amenorrhea isHypogonadismHypopituitarismPregnancyOvarian tumor  <response>: C. i.e. Pregnancy 447- Ganong 22nd 422 - Ganong 23rd If menstrual bleeding has never occurred the condition is called primary amenorrhea Cessation of cycle in a woment with previously normal periods is called secondary amenorrhea. The commonest cause of secondary amenorrhea is pregnancy Effect of pregnancy on respiration is - Increased tidal volume Sec-amenorrhoea is - Absence of menstruation for 6 months Hypothalamic amonorrhoea is seen in - Kallaman s syndrome 