Scanty ,light or infrequent menses , known as oligomenorrhea, can be due to severe stress, poor nutrition, anorexia nervosa, physical exertion,thyroid disorders, infection like tuberculosis of the genital tract, polycystic ovarian disease, perimenopause & hormonal disturbances.
You need to consult a gynecologist for evaluation, accurate diagnosis & treatment . Evaluation may inlcude hormonal levels, PAP smear & ultrasound of the pelvis. Serum FSH measurment can be helpful in diagnosing menopause. But this diagnosis should be considered after other diagnoses have been excluded.
Some of the causes of oligomenorrhea may adversely affect fertility. Investigation & treatment of this oligomenorrhea should be sought to improve your chances of conceiving.
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Please note that the information provided is not a substitute to medical advice.