A menstrual cycle is regular if menstruation occur every 25-35 days. If less than 25 days, the cycle is described as short (polymenorrhoea). Over 35 days, it is described as long (oligomenorrhoea).
In addition, menstruation may be too long (if it lasts more than a week) or too abundant (and, for example, includes blood clots). These situations sometimes cause anaemia, i.e. a low red blood cell count.
Abnormal uterine bleeding my also occur outside of menstruation (metrorrhagia).
Period problems may be linked to:
Your case history (the information you provide about the history of your disease), a gynaecological examination, pelvic ultrasound scan, assays of blood hormones, and perhaps some additional examinations will allow a precise diagnosis to be made so that appropriate treatment can be offered to you.