I used to have heavy periods usually (upto 5 days were 1st 2 days being very heavy). But for the past few months, my menstruation days have been reduced to 3 days with very light bleeding. The cycle is regular though. Even though its light, the periods pain is very bad and unbearable. Is this normal? Am unmarried. My haemoglobin was 9 in March. Had tested my Thyroid levels last because i have a thyroid lump of 2 cm but TFT was normal.