Other women's health

Why do I Have Dark Brown Period Blood

By Sara . Updated: January 16, 2017
Why do I Have Dark Brown Period Blood

A regular uniform flow of period blood ensures that your body is working perfectly. For most women it is a known fact as which days to expect a heavy flow and how long the period will last. But sometimes women might spot something unusual such as dark brown period blood and get scared. Dark period blood if flows just for 1 or 2 days is nothing serious. However, for more days, dark brown period blood flows for a number of reasons among which some might be an indication of problem in your body. If you've ever wondered why you have dark brown period blood, read this OneHowTo article and find out.

You may also be interested in: Why Is my Period Bright Orange


  1. A sign of old blood
  2. Pregnancy
  3. Miscarriage
  4. Birth Control Pills
  5. Endometriosis
  6. Adenomyosis
  7. Pelvic Inflammatory Disease

A sign of old blood

Often women experience dark brown period blood during the start of the menstrual cycle. This is because this blood is old.

For some women blood flow during menstruation is slow as compared to others. For such women the lining is not expelled completely and hence the uterus does not become squeaky clean. On the next period this leftover lining comes out in the beginning as dark brown period blood.


If scarce dark blood is discharged for 3 -4 days then it might be implantation bleeding. It occurs during early pregnancy and occurs in a few days following conception. However, it is important to know that this discharge isn't exactly period blood. It is mainly termed as brown blood discharge.


If dark brown or black vaginal bleeding occurs during pregnancy then chances are that you have suffered a miscarriage. This type of bleeding is abnormally heavy and laden with large clots. It slowly lessens and over time foul smelling scanty brown bleeding occurs.

If this type of blood discharge is accompanied by severe pain and signs of shock then it may be ectopic pregnancy. In such case immediate medical attention must be taken.

Why do I Have Dark Brown Period Blood - Miscarriage

Birth Control Pills

Contraception pills used by women to prevent unwanted pregnancy may sometime lead to discharge of dark brown period blood. There are many side effects of birth control pills such as irregular menstrual cycle, acne and others. Similarly, discharge of dark brown period blood is also a side effect of birth control pills.


Endometriosis is an abnormal uterine condition in which the tissues lining the uterus develop outside the uterus. Due to this condition thickening of blood and blood clotting occurs. This causes discharge of dark brown period blood.


When uterine lining grows in the muscles of uterine walls, it is termed as Adenomyosis. Due to adenomyosis blood clotting occurs which thickens blood and dark brown period blood is discharged.

Pelvic Inflammatory Disease

Pelvic inflammatory diseases are caused due to infections of cervix, uterus or vagina. Such infections cause brown vaginal bleeding. You can get these infections from many sources, and they can also be spread through sexual contact. Due to pelvic inflammatory disease pain occurs during urination along with pelvic pain and discharge or dark brown period blood.

This article is merely informative, oneHOWTO does not have the authority to prescribe any medical treatments or create a diagnosis. We invite you to visit your doctor if you have any type of condition or pain.

If you want to read similar articles to Why do I Have Dark Brown Period Blood, we recommend you visit our Family health category.


  • Consult your gynaecologist if your dark brown period lasts for more than 3 days and is accompanied by pain in the abdominal area.
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Why do I Have Dark Brown Period Blood