Hematocolpos: When Menstrual Blood Gets Trapped
Share
Your daughter is 13 or 14 years old, her breasts have developed, she has pubic hair, but she has never had her period. Yet, every month, she has severe lower abdominal pain that lasts a few days and then disappears. This is exactly the typical presentation of a hematocolposMenstruation does exist; the body produces it every month, but it cannot flow due to an obstruction, most often an imperforate hymen. The blood then accumulates in the vagina instead of flowing out.
It's a rare malformation, affecting approximately 1 in 1000 to 2000 female births, but diagnosis is straightforward once it's considered, and treatment is just as simple. The real risk lies precisely in not considering it and looking for the source of the pain elsewhere for months.
🚩 The signal to recognize
What Actually Happens in the Body
The hymen is a thin membrane that surrounds the vaginal opening. During fetal development, it is supposed to naturally perforate to allow passage. When this perforation does not occur, it is called an imperforate hymen, the most common cause of hematocolpos.
Until a girl reaches puberty, this closed membrane poses no problem since there is nothing to expel. But from the first period onward, the uterus continues to produce menstrual blood each month, just like in any adolescent girl. With no way out, this blood gradually accumulates in the vagina, sometimes even reaching the uterus (this is called hematometra) or the fallopian tubes (hematosalpinx).
💡 The exact term Cryptomenorrhea describes a condition where menstruation occurs but is not visible. This differs from classic primary amenorrhea, where the body does not produce menstrual flow at all.
Why Diagnosis Sometimes Takes Time
The classic pitfall is that cyclical pain without menstruation resembles many other things, and no one spontaneously thinks to look at the vulva. Several cases published in the medical literature show adolescent girls treated for months for constipation or digestive pain, or even mistakenly operated on for suspected appendicitis, before an imperforate hymen was discovered.
| A lead that was wrongly suggested | Why the confusion? |
|---|---|
| Ovarian cyst | On ultrasound, a pelvic mass can resemble a cyst if one does not think to examine the vulva. |
| Chronic constipation | The accumulated mass of blood compresses the rectum and disrupts bowel movements. |
| Appendicitis | Acute abdominal pain that can be mistakenly interpreted as a digestive surgical emergency. |
| Vaginal agenesis | Without careful examination, a bulging membrane can be mistaken for the absence of a vagina. |
This underscores the importance, when faced with cyclical pelvic pain without menstruation in an adolescent girl, of always performing a simple visual examination of the vulva before exploring other possibilities. It's a quick, painless procedure, and often sufficient to point directly to the correct diagnosis.
How is the diagnosis made?
The good news is that this diagnosis is usually easy to confirm once it's mentioned. Two steps are sufficient in the vast majority of cases.
1. The Visual Examination
The doctor examines the vulva. In the case of an imperforate hymen, the membrane appears bulging outwards and bluish in color, due to the blood accumulated just behind it.
2. Pelvic Ultrasound
She confirms the volume of accumulated blood, checks that the uterus and ovaries are normal, and rules out a more complex associated malformation.
An MRI may be requested as a supplementary examination if the presentation is atypical or to better visualize the anatomy before surgery. However, in a simple case of an imperforate hymen, clinical examination combined with ultrasound is generally sufficient to establish the diagnosis.
The treatment is simpler than you might think.
The idea of surgery can be frightening, but the procedure itself, called hymenotomy or hymenectomy, remains a short and well-controlled surgical intervention. The surgeon makes a small cross-shaped incision in the membrane to allow the drainage of accumulated blood, which can amount to several hundred milliliters, sometimes more than a liter in cases discovered late.
What can we realistically expect?
Discharge usually takes place the day after the procedure. No special nursing care is required at home. A 3- to 4-day exemption from sports or school is typically prescribed, and it is recommended to avoid strenuous physical activity for approximately 15 days.
Post-operative pain is generally well controlled with standard analgesics. Complications are rare, the main risk being a small recurrence of the closure, which may require further intervention.
After the procedure, menstrual cycles usually return to normal. Gynecological follow-up is recommended in the months that follow to ensure everything is progressing well.
Why It's Better Not to Wait
An untreated hematocolpos does not resolve spontaneously, as the physical obstruction remains in place and the body continues to menstruate each month. The longer the diagnosis is delayed, the greater the volume of accumulated blood becomes, with potentially more serious consequences.
Possible complications in case of delay : backflow of blood towards the uterus and fallopian tubes (hematometry, hematosalpinx), reflux into the abdominal cavity which can promote endometriosis, compression of the bladder or rectum, and in the most advanced cases, a risk to future fertility if the fallopian tubes are permanently damaged.
Conversely, hematocolpos diagnosed and treated early generally has no long-term consequences for fertility or reproductive health. This is precisely what makes early recognition of the symptoms so important.
And with the newborn, it's different.
An imperforate hymen can also be detected at birth or in the first few weeks of life, but the clinical picture is completely different from that of an adolescent girl. In these cases, it is called hydrocolpos or mucocolpos, not hematocolpos, because menstruation has obviously not yet begun.
In this case, mucus and vaginal secretions accumulate, stimulated by maternal hormones still present in the baby's blood after birth. Clinically, this can manifest as a small abdominal mass or a bulging membrane visible during a newborn examination, sometimes even detected before birth during a prenatal ultrasound.
💡 Good to know A vulvar examination is part of the routine newborn check-up in maternity wards, precisely to detect this type of malformation as early as possible. Spontaneous rupture of the membrane can sometimes occur in the first few days of life, but this remains rare, and surgical intervention is the standard treatment.
Frequently Asked Questions
My daughter is 14 years old and still hasn't gotten her period, should I be worried?+
Not necessarily; the age of first menstruation normally varies between 9 and 16 years old, depending on the girl. What should raise concern is not the absence of menstruation itself at this age, but the association with pelvic pain that recurs monthly in a cyclical pattern. If this pattern is present, or if she still hasn't had her period after age 16, a gynecological consultation is necessary to check for any anatomical obstruction.
Does hymenotomy have a link with virginity?+
This is a medical procedure to treat a malformation, not something related to virginity. Its sole purpose is to allow for normal menstrual flow. In some teams, a medical certificate describing the procedure can be provided to the family upon request, simply to document the medical care received.
Does hematocolpos affect future fertility?+
When diagnosed and treated early, no. Fertility remains normal in the vast majority of cases. The risk mainly concerns very late diagnoses, where prolonged blood accumulation can damage the fallopian tubes or promote reflux endometriosis. This is precisely why early diagnosis truly makes a difference.
Can hematocolpos be confused with simple delayed puberty?+
This is precisely the key differentiating factor. In cases of simple delayed puberty, other signs of puberty (breast development, body hair) are also delayed or absent. In cases of hematocolpos, pubertal development follows its normal course; only menstruation appears to be absent, when in reality it is present but blocked. It is this dissociation between normal puberty and the absence of menstruation, combined with cyclical pain, that should point the way toward this diagnosis.
A Simple Examination Can Change Everything
Cyclical pain without menstruation in a pubescent adolescent girl is the first sign that should raise suspicion of hematocolpos before considering any other possibility. The examination to confirm or rule it out is simple, quick, and painless. And if the diagnosis is confirmed, treatment, in the vast majority of cases, remains a short procedure followed by a rapid return to normal life, including menstruation.
Sources & Scientific References
This article is based on medical publications and documented clinical cases.
- Nusrath MP, Anwar L. (2024). A Case Report of Hematometrocolpos in Two Adolescents: Divergent Clinical Presentations and Diagnostic Challenges. Cureus. DOI: 10.7759/cureus.67675
- Parikesit PG, et al. (2025). Diagnosis Dilemma of an Imperforate Hymen: A Rare Case With Atypical Symptoms. Cureus. DOI: 10.7759/cureus.83179
- Kumari R, et al. (2022). Cryptomenorrhea Due to Imperforate Hymen Leading to a Massive Hematocolpos. Case Reports in Obstetrics and Gynecology. PMC: 9464463
- Spontaneous rupture of the imperforate hymen in two newborns. Archives of Pediatrics, ScienceDirect. ScienceDirect
- Hematocolpos. Pediatric Surgery Lyon, Dr. Villemagne. Pediatric Surgery Lyon
