Why is period blood black in colour?

There are various reasons behind the period blood black colour. The dark or black colour of the blood appears when the blood is not evacuated fast enough from the uterus. This slow discharged blood becomes deoxygenated and due to which the period blood black colour changes from the red to black.

Why is Period blood black Causes and Treatments

Types of causes of period blood black

Period Blood Black is caused due to many reasons. Here are some common ones:

1. Normal period

During the period, you may see black blood discharged from the vagina before the start of the period or after the period. Black blood during before the period starts because of the elimination of old tissues of the endometrium from the uterus in preparation for the period.

2. Uterine polyps

A uterine polyp can prevent the cervix, resulting in the gathering of blood in the uterus. This can cause blood to become dark while coming out of your vagina.

3. Hormonal imbalance

Hormonal imbalance or fluctuations in hormones either due to medical condition which causes black blood period.

4. Ovulation

Ovulation is the split of a developed follicle present in the ovary with the release of egg or ovum. This ovum or egg, when together fertilized by the sperm, make you pregnant.

During this process, slight bleeding was seen to becomes out from the vagina as dark black blood about a week after the period ends. It can be ovulated and mainly halts in a few days with some cramps.

Other symptoms and signs of ovulation are

  • Ovulation cramps or pain
  • Stretchy clear, watery discharge
  • The temperature of the body increased after ovulation.
  • The slight dip in basal body temperature just before ovulation
  • It will increase the sexual desire

Find out important facts about ovulation here.

5. Pregnancy

If you experience the brown, black blood a week or days before the period, it may be due to implantation bleeding or pregnancy.

Black blood before period

Black blood a few days before period is a sign of pregnancy, or it could be caused by an infection or disease.

Dark red period blood: could I be pregnant?

Why is Period blood black Causes and Treatments

In some cases, some women experience a brown discharge instead of period.

Light bleeding around 6-7 days past ovulation is usually associated with implantation bleeding. This discharge could be pinkish in colour or bright red. The light colour of implantation bleeding suggests that the blood is fresh from the fertilized egg trying to attach and bury itself in the uterine lining.​

If you are trying to conceive and you have sex close to ovulation, wait until you have missed your period to test for pregnancy. Women with endometriosis, PCOS, Ovarian Premature failure also experience discharge or mucus before their period.

Period blood black at the beginning of the period

Dark blood at the beginning of the period is very common. This is the process in which the uterus gets rid of old blood that it didn’t expel in the previous cycle. The period should be back to usual red after 1 -2days of black period spotting or flow.

Black discharge after period

Usually, the colour of the release is bright yellow or whites; it actually maintains the cleanliness of the vaginal area. But sometimes woman faces black discharge after the period it is mainly because of improper or lack of nutrition, infection, disease, change in the menstrual cycle, and birth control pills intake.