It was a quiet morning at the outpatient clinic when 23-year-old Sita walked in with a puzzled expression. She looked perfectly healthy—until she spoke.
“Doctor,” she began, “every month when my friends get their periods, I don’t bleed like them. Instead, blood comes out from my nose.”
At first, everyone thought it was a coincidence. Maybe sinus problems? Maybe dry air? But the timing was too perfect—every 28 days, her nose would bleed for two or three days, right when her lower abdomen cramped and her mood shifted.
The Curious Case
After a few cycles of this strange pattern, Sita’s physician grew suspicious and ordered tests. Hormones were normal. Sinus scan—clean. Then came the question that changed everything:
“Does your nosebleed coincide with your menstrual cycle?”
When Sita nodded, the puzzle pieces clicked together. The diagnosis: Vicarious Menstruation—a rare and fascinating medical phenomenon where menstrual bleeding occurs from sites outside the uterus.
What Is Vicarious Menstruation?
Vicarious menstruation happens when the body’s endometrial-like tissue or hormone-sensitive mucosa outside the uterus responds to the same hormonal cycle that causes normal menstruation.
In simpler terms, when the uterine lining sheds, some other part of the body “joins in.”
Reported sites include:
Nose (most common – causing cyclical nosebleeds)
Lungs (causing hemoptysis or blood in sputum)
Skin (cyclical bruises or bleeding spots)
Eyes, ears, or even gastrointestinal tract in rare cases
How Does It Happen?
The exact cause isn’t fully understood, but doctors believe it may occur due to:
Hormonal sensitivity: Mucous membranes in certain organs respond to estrogen and progesterone fluctuations.
Endometrial implantation: Rarely, endometrial cells may reach other body sites via blood or lymphatic spread (similar to endometriosis).
Vascular fragility: Hormonal changes may increase capillary fragility during menses.
Sita’s Diagnosis and Treatment
Sita’s case was confirmed after observing the pattern for several months. ENT evaluation found fragile nasal capillaries that responded to hormone fluctuations.
Treatment involved hormonal regulation using oral contraceptive pills to suppress ovulation and stabilize estrogen levels. Within two months, her nosebleeds stopped—and normal menstruation returned.
Why It Matters
Vicarious menstruation reminds us that the human body is deeply interconnected. Hormones don’t just act in one place—they ripple through every organ, tissue, and mood.
For healthcare students and young clinicians, Sita’s story is a gentle warning:
“Always listen to the cycle. Not every period happens through the uterus.”
Takeaway for Readers
If someone experiences cyclical bleeding from any unusual site—nose, eyes, skin—it’s worth noting the timing. Keeping a menstrual diary can help doctors detect such patterns.
It’s rare, yes—but as Sita’s story shows, even the body’s most mysterious messages make sense when we listen carefully.
The follicular phase is the initial stage of the menstrual cycle, marked by the development and maturation of ovarian follicles. It begins on the first day of menstruation and lasts until ovulation. During this phase, the hypothalamus releases gonadotropin-releasing hormone (GnRH), which stimulates the anterior pituitary gland to release follicle-stimulating hormone (FSH). FSH, in turn, acts on the ovaries, promoting the growth and development of several follicles. As the follicles mature, they produce estrogen, which has various effects on the body. Estrogen stimulates the thickening of the uterine lining (endometrium) in preparation for potential implantation and inhibits further FSH production to prevent excessive follicle development. Eventually, one dominant follicle emerges and continues to mature, while the others undergo atresia. The follicular phase concludes with a surge in luteinizing hormone (LH), triggered by rising estrogen levels, which sets the stage for ovulation and the subsequent luteal phase of the menstrual cycle.
A. Follicle-Stimulating Hormone (FSH)
Initiates follicular development in the ovaries
Stimulates the production of estrogen
B. Estrogen
Promotes the proliferation of the endometrium
Inhibits follicle-stimulating hormone (FSH) to prevent excessive follicle development
Stimulates the production of luteinizing hormone (LH)
Ovulation in humans refers to the release of a mature egg (oocyte) from the ovary into the fallopian tube. It is a crucial event in the menstrual cycle and typically occurs around the midpoint of the cycle, approximately 14 days before the start of the next menstrual period. Ovulation is triggered by a surge in luteinizing hormone (LH) levels, which is primarily stimulated by high levels of estrogen. This surge causes the dominant ovarian follicle, which has been developing during the follicular phase, to rupture and release the mature egg.
The egg is then swept into the fallopian tube, where it awaits fertilization by sperm. Ovulation is a brief process, usually lasting only a few minutes to hours. It marks the fertile period of a woman’s menstrual cycle, and successful fertilization during this time can lead to pregnancy. If fertilization does not occur, the unfertilized egg disintegrates, and the woman enters the subsequent luteal phase, leading to menstruation and the beginning of a new cycle.
A. Luteinizing Hormone (LH)
Surge in LH levels causes the dominant follicle to rupture and release the mature egg
Initiates the conversion of the ruptured follicle into the corpus luteum
III. Luteal Phase:
The luteal phase is a stage of the menstrual cycle that follows ovulation and precedes menstruation. It is characterized by the presence and activity of the corpus luteum, which forms from the ruptured ovarian follicle after the release of the egg during ovulation. The luteal phase typically lasts for about 10 to 16 days and is marked by significant hormonal changes.
Once the egg is released, the ruptured follicle undergoes a transformation and becomes the corpus luteum. The corpus luteum primarily produces progesterone, along with smaller amounts of estrogen and other hormones. Progesterone plays a crucial role in preparing the uterus for possible embryo implantation.
Ovarian cycle in menstrual cycle
During the luteal phase, the increased levels of progesterone and estrogen contribute to the thickening of the uterine lining (endometrium), making it more receptive to a fertilized egg. The endometrium develops a rich blood supply and glandular secretions to support embryo implantation.
If fertilization occurs during the luteal phase, the fertilized egg implants itself into the thickened endometrium, leading to pregnancy. The corpus luteum continues to produce progesterone, maintaining the endometrium and supporting the early stages of pregnancy until the placenta takes over hormone production.
However, if fertilization does not occur, the corpus luteum gradually regresses, leading to a decrease in progesterone and estrogen production. As hormone levels decline, the endometrium is no longer sustained, and it begins to break down. This breakdown results in the shedding of the endometrial lining, leading to menstrual bleeding and the start of a new menstrual cycle.
The length of the luteal phase remains relatively constant for each individual, typically ranging from 10 to 16 days. Monitoring the length of the luteal phase is important in assessing the overall health of a woman’s menstrual cycle and fertility. A consistently short luteal phase, known as luteal phase defect, may pose challenges for successful implantation and can be associated with fertility issues.
A. Corpus Luteum
Secretes progesterone
Supports the maintenance of the endometrium for potential embryo implantation
Inhibits the production of FSH and LH to prevent further ovulation
B. Progesterone
Thickens the endometrium, preparing it for potential implantation
Suppresses the immune response to protect a developing embryo
Prepares the mammary glands for potential lactation
IV. Menstruation:
Menstruation, also known as a menstrual period or simply a period, is a natural process that occurs in humans with reproductive capacity. It is a crucial part of the menstrual cycle and refers to the monthly shedding of the uterine lining (endometrium) when pregnancy does not occur. Menstruation typically lasts for about 3 to 7 days, but the duration can vary from person to person. The onset of menstruation, known as menarche, usually begins during puberty and continues until menopause.
During menstruation, hormonal changes, specifically a decrease in progesterone and estrogen levels, trigger the release of substances that cause the blood vessels in the endometrium to constrict and the lining to break down. This results in the menstrual flow, which consists of blood, mucus, and tissue from the uterus, exiting the body through the vagina. Menstruation serves as an indicator of reproductive health and plays a significant role in the reproductive cycle, preparing the uterus for potential pregnancy in the subsequent menstrual cycle
A. Decreased Levels of Estrogen and Progesterone
Withdrawal of hormonal support leads to endometrial shedding
Initiates menstrual bleeding
Conclusion: Summary of roles of hormones in menstrual cycle
The menstrual cycle is a highly regulated process involving a precise sequence of hormonal events. Understanding the roles of hormones in each phase is essential for medical students. From follicular development to ovulation, corpus luteum formation, and menstrual shedding, hormones play a critical role at every step. By grasping this intricate dance, medical students can develop a comprehensive understanding of reproductive physiology and provide better care to their patients in the future.
Please read through all the article to know thyroid disorders and everything else about them. Tips are at the end.
What is thyroid?
Thyroid is a endocrine gland located in central neck. This gland produces thyroid hormones names T3 and T4 (tri-iodithroxin and tetraiodothyroxine). T3 is less in amount but more active while T4 is large in amount and less actice. For T4 to act in body it first needs to be converted in T3 which is done in the tissues. Almost all of the human cells need thyroid hormones to function well.
Today, May 25th is the world thyroid day. It is a day celebrated internationally in a inntention to spread awareness regarding thyroid hormones, it importance and diseases realted to thyroid hormones and thyroid gland. Ths day is recognized globally by the American Thyroid Association in cooperation with the European Thyroid Association, the Asia-Oceania Thyroid Association and the Latin American Thyroid Society, to empower people with education about thyroid gland and thyroid gland related diseases.
What hormones are produced by thyroid gland?
T3 and T4 are the hormones produced by thyroid gland. Besides this Calcitonn is also produced by the thyroid gland but this is related to calcium metabolism.
For T3 and T4 to be produced in thyroid, The pituitary gland needs to secrete TSH (thyroid stimulating hormone). Check the following diagram.
TSH is the hormone necessary to regulate the amount of T3 and T4 secreted in body. (Check diagram) TSH is also regulated by amount of TRH (thyrotropin releasing hormone) produced by the anterior pituitary gland.
What are the 10 functions of the thyroid hormones?
Here is complete list of functions of thyroid hormones. Here, you can see that thyroid hormone is realted to all the body which signifies its importance.
Brain maturation
Bone and body growth
Control of heart function and autonomic nervous system
Maintainance of basal metabolic rate
Regulation of blood sugar levels
Control of lipid and cholesterol level
Maturation of lungs of babies
Sexual and reproductive health maintainance
Prevention of infection and accelerate healing
Regulation and maintainance of body nad body functions
How do you know if your thyroid is not working well?
25 features of thyroid disorder everyone must know
Here is list of few symptoms that are seen in thyroid hormones related disorders. But these symptoms may vary depending whether you have more or less thyroid production. (See picture: Hypo vs Hyperthyroidism)
Irregular bowel movements
Thinning of hair, hairrfall, dry hair
Hairs that wont grow
High cholesterol level
Waking up with headache, weakness, bodyache
Difficulty gaining weight or sudden losing of weight
Cold or very warm hands and feet
Fatigue, weakness and lack of energy thats persistent
Lack of motivation, mood swings, difficulty concentrating
