Hormones, Cycles & Ovulation

Common hormonal disorders affecting fertility

Common hormonal disorders affecting fertility

How hormones coordinate fertility Reproductive function is controlled by a feedback network called the hypothalamic-pituitary-gonadal axis. The hypothalamus releases gonadotropin-releasing hormone, the pituitary responds with luteinizing hormone and follicle-stimulating hormone, and the ovaries or testes then produce sex steroids and gametes. That signaling has to be timed precisely. If the rhythm is disrupted, ovulation may […]

Hyperprolactinemia: high prolactin, ovulation impact, and symptoms

Hyperprolactinemia: high prolactin, ovulation impact, and symptoms

What prolactin is and why hyperprolactinemia matters Prolactin is produced mainly by lactotroph cells in the anterior pituitary gland. Under usual circumstances, dopamine from the hypothalamus acts as a brake on prolactin secretion. When dopamine signaling is reduced, or when pituitary lactotroph cells are overactive, prolactin can rise. During pregnancy and lactation, high prolactin is […]

Progesterone deficiency and fertility

Progesterone deficiency and fertility

Progesterone’s role in the fertile cycle Progesterone is produced mainly by the corpus luteum, the temporary endocrine structure that forms in the ovary after ovulation. In the first half of the menstrual cycle, estrogen helps the endometrium grow. After ovulation, progesterone changes that lining into a secretory, implantation-ready tissue. It influences endometrial glands, blood vessel […]

Luteal phase defect explained

Luteal phase defect explained

What is the luteal phase? The menstrual cycle is often divided into two broad halves. The follicular phase begins with menstruation and leads up to ovulation. The luteal phase begins after ovulation, when the ruptured follicle transforms into the corpus luteum, a temporary hormone-producing structure in the ovary. The corpus luteum produces progesterone, along with […]

Anovulation: causes, detection, chronic patterns, and fertility impact

Anovulation: causes, detection, chronic patterns, and fertility impact

What anovulation means In a typical ovulatory menstrual cycle, coordinated signals from the hypothalamus, pituitary gland, ovaries, and uterus lead to follicle development, a mid-cycle luteinizing hormone surge, egg release, progesterone production after ovulation, and then either pregnancy or menstrual bleeding. Anovulation interrupts this sequence: a follicle may not mature properly, the hormonal surge may […]

Irregular menstrual cycles and fertility

Irregular menstrual cycles and fertility

What counts as an irregular menstrual cycle? A menstrual cycle is counted from the first day of one period to the first day of the next. Many adults have cycles somewhere around 24 to 38 days, but “normal” is not the same as identical from month to month. Some variation is expected, particularly after stopping […]

Signs of hormonal imbalance in women

Signs of hormonal imbalance in women

What hormonal imbalance means in women A hormonal imbalance means that one or more hormones are present in too much or too little quantity, or that tissues are not responding to them normally. In women’s health, the most commonly discussed hormones include estrogen and progesterone, which regulate the menstrual cycle and support pregnancy; luteinizing hormone […]

Hormonal imbalance and fertility problems

Hormonal imbalance and fertility problems

How hormones regulate fertility Fertility depends on a coordinated hypothalamic-pituitary-gonadal axis. The hypothalamus releases gonadotropin-releasing hormone in pulses, which signals the pituitary gland to produce follicle-stimulating hormone and luteinizing hormone. These hormones stimulate ovarian follicles to grow, produce estradiol, and eventually trigger ovulation. After ovulation, the corpus luteum produces progesterone, which helps stabilize the endometrium […]