Pregnancy: Conception – Maternity – Trimester
Underweight and fertility issues

Underweight and fertility issues

How underweight can affect fertility Fertility depends on a tightly regulated hormonal network. When someone is significantly underweight, especially for a sustained period, the body may interpret that as a state of limited resources. In response, the hypothalamic-pituitary-gonadal axis can slow down, which reduces the signals needed for normal reproduction. This is one reason chronic […]

Thyroid hormones and ovulation

Thyroid hormones and ovulation

How thyroid hormones participate in ovulation Ovulation is usually described as an ovarian event, but it is really the end point of a larger endocrine conversation. Thyrotropin-releasing hormone, thyroid-stimulating hormone, estradiol, progesterone, and the gonadotropins all influence one another through the hypothalamic-pituitary-ovarian axis. In that network, thyroid hormones help set the metabolic and cellular context […]

Hypothyroidism and infertility

Hypothyroidism and infertility

How hypothyroidism can affect fertility Thyroid hormone interacts with the hypothalamic-pituitary-ovarian axis, so a low thyroid state can have downstream effects on reproductive function. Clinically, hypothyroidism is associated with menstrual irregularity, including heavier bleeding, longer cycles, or, in some cases, infrequent ovulation. If ovulation is delayed or absent, conception becomes less likely simply because fewer […]

Hyperthyroidism and conception problems

Hyperthyroidism and conception problems

How hyperthyroidism can interfere with conception Hyperthyroidism means the body is exposed to too much thyroid hormone, most often because of Graves’ disease, thyroiditis, or another thyroid disorder. Thyroid hormone has wide metabolic effects, but it also interacts closely with the hypothalamic-pituitary-gonadal axis, which is the hormonal network that helps regulate ovulation, menstruation, sperm production, […]

STD impact on reproductive health

STD impact on reproductive health

How STIs affect the reproductive tract The reproductive tract is vulnerable because many STIs begin at mucosal surfaces, such as the cervix, urethra, rectum, or vagina, and then trigger local inflammation. If the infection is not recognized, organisms can sometimes ascend into the upper genital tract. In women, that means the uterus, fallopian tubes, and […]

Hormonal medications impact

Hormonal medications impact

What hormonal medications are designed to do Hormonal medications include drugs that supply, block, or modulate endogenous hormones such as estrogen, progesterone, and related endocrine signals. In menopause care, they are often used to reduce vasomotor symptoms such as hot flashes and night sweats, and some regimens also help protect bone density. The intended effect […]

Antidepressants and fertility

Antidepressants and fertility

What the research can and cannot tell us Fertility research often uses the term fecundability, meaning the probability of conception in a single menstrual cycle among people having intercourse without contraception. This is different from infertility, which is usually defined clinically after 12 months of trying to conceive, or after 6 months when the person […]

Medication effects on fertility

Medication effects on fertility

How medications can affect fertility Fertility is not controlled by a single organ or one laboratory value. It depends on coordinated hormone signaling, healthy gamete production, sexual function, and timing. Medications can disrupt any of these steps. In the male reproductive system, the best-described mechanism is suppression of the hypothalamic-pituitary-gonadal axis, the hormonal circuit that […]

Cortisol and reproductive hormones

Cortisol and reproductive hormones

How cortisol fits into reproductive endocrinology Cortisol is produced by the adrenal cortex under control of the hypothalamic-pituitary-adrenal (HPA) axis. In parallel, reproductive function depends on the hypothalamic-pituitary-gonadal (HPG) axis, which regulates gonadotropin-releasing hormone (GnRH), luteinizing hormone (LH), follicle-stimulating hormone (FSH), and downstream ovarian hormones such as estradiol and progesterone. These two systems do not […]

Chronic stress and ovulation disruption

Chronic stress and ovulation disruption

How chronic stress affects the reproductive axis Ovulation depends on coordinated signaling across the hypothalamic-pituitary-ovarian (HPO) axis. In a typical cycle, the hypothalamus releases gonadotropin-releasing hormone, or GnRH, in a pulsatile pattern. That pulse pattern tells the pituitary to release follicle-stimulating hormone and luteinizing hormone, which in turn support follicle growth, estradiol production, and the […]