Causes of Abnormal Vaginal Bleeding

Vaginal bleeding is something that most women experience between their periods when they are not due for a menstrual cycle. It is considered as an abnormal occurrence when you bleed before you are expecting your menstrual period, or after you are done with your monthly cycle. It is usually characterised by bouts of spotting where a thick brown reddish discharge may be experienced. Also, this kind of bleeding is considered abnormal if it occurs during pregnancy or menopause.

Here are a few causes of abnormal vaginal bleeding:

1. Hormones: An imbalance in the hormones like the estrogen and progesterone can lead to abnormal vaginal bleeding. These are the hormones that help in regulation of the monthly menstrual cycles. An imbalance can occur due to side effects caused by birth control pills that may not suit the individual, a contraceptive patch, or even contraceptive implants and injections. Further, an intrauterine device may also be the cause for this kind of bleeding. The hormonal balance can also get affected due to internal ailments like a dysfunctional thyroid gland and ovaries.
2. Pregnancy and Delivery: Some amount of spotting is considered normal in the first trimester of one's pregnancy. Yet, severe bleeding and persistent spotting must be reported to the gynaecologist immediately. Women also bleed for a while after the delivery of the baby, in the postpartum period. This may also happen when an abortion takes place as the uterus may not have come back to its original size and due to remaining foetal tissues within. Complications during the pregnancy like an ectopic pregnancy or a miscarriage can also lead to such kind of bleeding. An ectopic pregnancy is one where the egg gets implanted in the fallopian tube instead of entering and implanting itself in the uterus.
3. Fibroids: Uterine fibroids are usually considered as non-malignant and non-cancerous growths within the uterus. These are common in many women who have gone through childbirth. These fibroids can also cause some amount of bleeding and spotting.
4. Infections: When there is an infection in the reproductive organs like the ovaries and uterus of the patient, there may be some amount of bleeding. An infection in this area can also cause inflammation, which is one of the primary causes of abnormal bleeding. This can also occur due to a sexually transmitted disease or STD, as well as painful intercourse and sexual abuse which can lead to scarring as well.
5. Cancer: One of the least common causes includes cervical, ovarian and other forms of cancer. 

Stress and diabetes can also cause abnormal vaginal bleeding in rare cases. It is best to see a doctor as soon as such bleeding takes place.