Abnormal vaginal bleeding is unexpected bleeding from the inside of the vagina. What is considered abnormal varies, depending on what is normal for a particular woman.

Examples of abnormal vaginal bleeding include bleeding:

• When a woman isn't expecting her menstrual period.
• After sex.
• When a woman's menstrual flow is lighter or heavier than is normal for her.
• At an unexpected time of life, such as before age 10 or after menopause.