What is the most common cause of abnormal uterine bleeding?

ABNORMAL UTERINE BLEEDING IN
GIRLS:-

• The first period in a girls life is
  always abnormal caused by foreign body or trauma.


• Sexual
  Abuse

ABNORMAL UTERINE BLEEDING IN
ADOLESCENTS:-

• The first menstrual period causes
  irregular bleeding for a few months till a girl's hormonal cycle and ovulation
  normalizes.


• Infection


• Pregnancy


• Coagulation
  disorders


• Malignancy

ABNORMAL
UTERINE BLEEDING IN WOMEN BETWEEN ADOLESCENCE AND
MENOPAUSE

• Vaginal spotting can be caused because
  of abrupt change in hormonal levels


• Women using hormonal
  birth control
  methods 


• Anovulation


• Cancer
  of cervix

ABNORMAL UTERINE BLEEDING IN
MENOPAUSAL WOMEN:-

• Thinning of tissues around
  uterus and vagina


• Side effects of radiation
  therapy


• Infections


• Use of
  blood thinning tablets

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The most
common cause of abnormal uterine bleeding is
ANOVULATION.

Anovulation
occurs when women skip ovulation, also known as anovulatory cycle. In Anovulation,
menstrual cycle is normal but ovulation wont occur. It is common in women in early and
late years of menstruation. 

Common
causes of anovulation are as
follows:-

• Stress


• Eating
  habits


• Overexertion