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You are more likely to have amenorrhea
if you:Are obese,Exercise excessively and for long periods of time,Have less than 15% - 17% body fat,Have severe anxiety or emotional distress,Lose a lot of weight suddenly. It could also be due to Polycystic ovarian syndrome
,Premature ovarian failure
,Thyroid or prolactin dysfunction
. Hormone shots for birth control like depot provera may also lead to amenorrhea. You need to consult a gynecologist soon. Take care.