Women's Health

Persistent infection with high-risk HPV integrates viral oncoproteins into cervical transformation-zone cells, disabling the cell's own tumour-suppressor brakes and driving progression through preinvasive change to invasive cancer over many years: a window that screening is designed to exploit.

A fertilised ovum implants outside the uterine cavity, most often in the fallopian tube, which cannot safely expand to accommodate a growing pregnancy and eventually ruptures through its own vessels, a time-critical surgical emergency.

Endometrial-like tissue implants outside the uterus and continues to respond to the ovarian cycle exactly as normal endometrium does, but with no way to shed and exit the body, so it bleeds internally each month and provokes chronic inflammation and fibrosis.

Placental hormones progressively induce maternal insulin resistance through pregnancy, and gestational diabetes emerges when the pancreas cannot secrete enough extra insulin to compensate, leaving glucose (and its downstream fetal effects) uncontrolled.

An exaggerated response to rising beta-hCG in early pregnancy drives vomiting so severe and persistent that it causes dehydration, electrolyte disturbance and starvation ketosis, a diagnosis of exclusion that can rapidly become an emergency.

Depletion of the finite ovarian follicle pool causes oestradiol production to fail despite rising pituitary drive, and the resulting oestrogen withdrawal produces effects across every tissue that depends on it, which HRT works by directly replacing.

Loss of a pregnancy before 24 weeks, usually because a chromosomally abnormal conceptus stops developing and the uterus then separates and expels it: the clinical subtype simply reflects how far that expulsion has progressed.

Most ovarian cancer arises from fallopian tube or ovarian surface epithelium and spreads early across the capacious peritoneal cavity rather than via lymphatics, which is why it produces only vague abdominal symptoms and is usually advanced by the time it is diagnosed.

Insulin resistance drives compensatory hyperinsulinaemia that pushes the ovary to overproduce androgens and arrests follicle development, producing the combination of hyperandrogenism, anovulation and polycystic ovaries.

Excessive bleeding after birth, most often because the emptied uterus fails to contract and clamp its own spiral arteries, managed by a mechanistically ordered sequence of uterotonics and haemostatic measures.

A placental disorder of pregnancy in which anti-angiogenic factors injure maternal endothelium, producing new hypertension with proteinuria or organ dysfunction after 20 weeks, curable only by delivery.

Benign smooth-muscle tumours of the myometrium grow under the drive of oestrogen and progesterone, which is why they enlarge through the reproductive years and regress after the menopause, distorting the uterus and disrupting normal menstrual haemostasis as they grow.