ovulations

Ovulation is the release of a mature oocyte (egg) from a ovarian follicle, typically as part of the menstrual cycle. In humans, this event is triggered by a surge of luteinizing hormone (LH) that causes the follicle to rupture and release the egg into the fallopian tube, where it may be fertilized. After ovulation, the ruptured follicle becomes the corpus luteum and secretes progesterone to support a potential early pregnancy. The timing of ovulation varies widely among individuals and cycles, but it is commonly described as occurring mid-cycle, roughly around day 14 in a standard 28-day cycle.

Most cycles involve a single ovulation, but in some cycles more than one follicle can release an egg. This is known as multiple or hyperovulation and can increase the chance of conceiving fraternal twins. Various factors influence ovulation, including age, hormonal balance, body weight, stress, and certain medical treatments. Anovulatory cycles, in which ovulation does not occur, are also possible and are more common in conditions such as polycystic ovary syndrome (PCOS), thyroid disorders, or after significant weight loss or illness.

Signs of ovulation can include changes in cervical mucus to a clear, stretchy consistency, a small increase in basal body temperature following the egg’s release, and, for some individuals, mid-cycle abdominal discomfort (mittelschmerz). Ovulation predictor kits detect the LH surge in urine as a signal that ovulation is likely to occur within the next 24 to 36 hours.

Understanding ovulation is central to fertility planning, contraception, and certain assisted reproductive technologies that rely on timing or inducing ovulation.