Why uterine bleeding occurs

Uterine hemorrhages are divided into 2 broad categories: bleeding as a result of abnormalities in internal organs and systems, and bleeding caused by abnormalities in the genital area. Non-genital causes include infectious diseases (measles, influenza, typhoid, sepsis), blood disorders (hemophilia, hemorrhagic vasculitis), liver diseases (cirrhosis), diseases of the cardiovascular system (atherosclerosis, hypertension), thyroid dysfunction. Genital causes of uterine bleeding associated with early pregnancy may be as follows: abnormal pregnancy (ectopic or uterine), diseases of the ovum (chorionepithelioma, vesicle skid).
Genital causes of bleeding associated with late pregnancy: premature detachment of the placenta, scar on the uterus, placenta previa, the process of destruction of tissue on the cervix, uterus, trauma to the vagina and vulva,low placenta, rupture of the attachment of the placenta, delayed discharge of the separated placenta, restraint of the placenta. Bleeding after childbirth can develop due to a decrease in the tone of the uterus, delayed parts of the afterbirth, injuries of the soft genital tract, endometritis, chorionepithelioma, uterine myomas.
There is a large group of genital causes of uterine bleeding not associated with pregnancy: dyscirculatory uterine bleeding (juvenile, reproductive, menopausal), ovarian cancer, uterine ruptures ovary, ruptured ovarian cyst, uterine trauma, vaginitis, endometritis, cervicitis, cervical erosion, infection -inflammatory processes. Dysfunctional uterine bleeding can also be caused by the rejection of the endometrial layer as a result of a decrease in the concentration of female sex hormones (gestagens, estrogens), and disturbances in the ovulation process. Similar phenomena are often observed among women aged 30-40 years.
There are heavy and prolonged bleeding, which coincide with menstruation in time. They are called menorrhagia. Bleeding that occurs between menstruation is irregular and has a different intensity.As a result of a failure in the hormonal system of a woman, ovulation becomes impossible, while the uterine mucosa (endometrium) grows with insufficient development of blood vessels. Blood circulation is impaired, blood stagnates, and the permeability of blood vessels changes. In addition, the function of platelets (the main cells of the coagulation system) decreases, and blood thinning processes are enhanced. All this creates favorable conditions for the development of bleeding.

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