What causes irregular bleeding outside of the menstrual period?

Nov 23, 2022 Source: Cainiu Health
Disease description:

I don't know what's going on today, but I'm having vaginal bleeding even though I'm not in my menstrual period. I'd like to ask, what are the possible causes of irregular bleeding outside of the menstrual cycle?

Doctor's answer (1)
Dr. Cao Ting
Irregular non-menstrual bleeding may be caused by conditions such as threatened miscarriage, embryonic demise, ectopic pregnancy, or extrauterine pregnancy. It can also result from inadequate luteal function or incomplete luteal regression. Additionally, organic lesions such as cervical polyps, endometrial polyps, or submucosal fibroids may also lead to irregular bleeding outside the menstrual period.