Health Tip: Bleeding Between Periods

Nov. 8 -- (HealthDay News) -- Menstrual bleeding typically occurs about every 28 days, and lasts for about four days at a time.

Vaginal bleeding that occurs outside of the menstrual cycle has many potential causes, and should be evaluated by a doctor.

Here are possible reasons for vaginal bleeding between menstrual cycles, courtesy of the U.S. National Library of Medicine:

• Cancer of the cervix, uterus or, rarely, fallopian tubes.
• A side effect of certain procedures, including cervical or endometrial biopsy.
• Stress or changing hormone levels.
• Uterine fibroids or polyps, or vaginal dryness.
• Pregnancy complications, including ectopic pregnancy or miscarriage.
• Disease or injury to the vaginal opening.
• Using an IUD, or stopping or starting the birth control pill.
• An underactive thyroid.
• Taking a blood thinner.