What Are the Causes of Menstrual Blood Clots?

| June 9, 2011 | 0 Comments

It is not unusual to pass a big blood clot during your menstrual periods, though it can make you think about it once for a while. Passing big blood clots during the menstrual periods is not something to worry about. Dr. Robert B. Albee of centerforendo.com states that the blood will clot if pools for a while in the uterus.

The Heavier You Bleed

The women, who usually have light menstrual periods, don’t experience any issues with blood clotting. Contrary to this, the women with high menstrual flow or bleeding normally experience issues regarding blood clotting. Almost all types of blood have the tendency to clot. Uterus in order to ensure the smooth flow of the blood out of the body, normally releases an anti-clotting agent. In case of heavy bleeding, the anti-clotting agent may often consume up before the period is finished and this eventually cause the blood left behind to clot.


There can be several different causes of blood clotting during menstrual periods. According to the Developmental Disabilities Health Alliance, the clots are in fact clumps of blood deposited in the vagina. Another website periodofmenstrual.info states that the clotting of blood is just caused because of the shedding of the uterine lining. Yet another website womenhealthzone.com explains the phenomenon as instability of the woman’s hormones. As for the women hormones work in accordance with the rest of the body organs, women don’t experience heavy flow, thus no clotting. Imbalance hormones are the major factor causing clotting. What actually happens is the wall of the uterus gets thick over the course of the time if hormones are not working in harmony, i.e. too much of estrogen or too little the progesterone or the opposite, eventually cause blood clots. According to the pregnancy.lovetoknow.com, the non-malignant, fibroid tumor that is present in most of the women can actually be the reason for blood clots. Another major cause of blood clots is the enlarged uterus.


Endometriosis is a very painful condition accounts for several repulsive symptoms involving the passing of blood clots as well. Endometrium is in fact the lining found inside the uterus that often appears on the wrong place such as on the fallopian tubes, on the ligaments supporting the woman between the uterus and the bowl and several other regions of pelvis. The appearance of these usually associated with the endometriosis. Despite of the fact that the lining occurs in the wrong place, it still comes into contact with the hormonal cycle and spill the blood every month. During all that process, the blood that remains outside the uterus remains in the abdominal cavity as a result of which women experience the development of scar tissue, adhesions, pain and inflammation.


Dr. JoAnn Manson who is a professor of Medicine at Harvard Medical School and Chief of Preventive Medicine at Brigham and Women’s Hospital states that if a woman is having frequent heavy menstrual periods in addition to lots of blood clots, this is the time to meet your healthcare provider immediately without any delay. Moreover, Dr. Manson believes that the blood clots may also be associated with the starting of menopause as well as because of anemia (iron-poor blood). Anemia is a condition caused by excessive loss of blood due to heavy menstrual bleed or flow. If this is for the first time that you experience the passing of blood clots, better consult your doctor. Depending on its nature, it can be severe or benign.

Color of the Blood

Dr Albee observes the color of the blood and its significance. According to him, the red blood (including menstrual blood) is quick enough to flow out of the body. However, the dark red blood is little heavier and flow slowly as compared to normal red blood. This slow rate of flow often causes this blood to accumulate inside the uterus, eventually causing the blood clots.


In case you are passing heavy blood clots and you have already been confirmed by your doctor that you are pregnant then there may likely be a chance that you have a miscarriage. If something like this happens, immediately contact your healthcare provider because if you have miscarried then you may have to undergo D&C procedure.

Young Women

Young women, especially those who have recently started having their menstrual periods often get worried when they pass a blood clot for the very first time. Remember, passing a blood clot twice or thrice in a day would not be an issue. The major part comes when keep on passing the blood clots the whole day with heavy bleeding. In that case, immediately rush to your healthcare provider so that she can have a better idea of what is in fact going on in your body, either you need a treatment or everything is normal.

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