Can ammnorrhea be treated??what are causes?

Often can be treated: Lack of periods may be caused by ow body weight, obesity, marked weight ^ or v, over-exercise, endurance athletics, breast-feeding, ^ stress, illness, eating disorders (bulimia or anorexia), anovulatory cycle (no egg released), travel, hormone irregularities, drug use, meds (i.e., birth control) or medical problems (i.e. PCOS). #1 reason is pregnancy.

Yes: Amenorrhea refers to no menstrual periods. Primary amenorrhea means never having had one before while secondary refers to someone who's had periods in past but not currently. Most common cause of amenorrhea is pregnancy which results from unprotected sexual activity, even if he promises to pull out. Check out http://www.mayoclinic.org/diseases-conditions/amenorrhea/basics/definition/con-20031561