The monthly cycle of changes in the ovaries and the lining of the uterus (endometrium), starting with the preparation of an egg for fertilization. When the follicle of the prepared egg in the ovary breaks, it is released for fertilization and ovulation occurs. Unless pregnancy occurs, the cycle ends with the shedding of part of the endometrium, which is menstruation. Although it is actually the end of the physical cycle, the first day of menstrual bleeding is designated as “day 1” of the menstrual cycle in medical parlance.
- Menstrual irregularity
The normal menstrual cycle is about four weeks long, and often follows the phases of the moon. Its length varies from three to seven days, but is usually consistent. However, girls and teenagers who menstruate are usually irregular. This is not a cause for concern unless regular menstruation has been established and is then lost. […]
- Menstrual migraine
A migraine headache that affects a woman each month between the 2nd day before the start of the menstrual period and the end of menstruation. Menstrual migraine is different from nonmenstrual attacks of migraine, even in the same women, in the regularity of its timing and its greater severity. Compared with other times in the […]
- Menstrual spotting
The presence of apparent menstrual blood during the wrong parts of the menstrual cycle. Some women have a tendency to bleed around ovulation, which occurs at about the 14th day after the first day of menstrual bleeding. In others, spotting can be a sign of internal problems, including fibroid tumors of the uterus, hormonal abnormalities, […]
- Menstrual synchronization
A phenomenon that occurs when two or more menstruating women live or otherwise spend a lot of time together, in which the menstrual cycles of the women gradually become synchronized. The mechanism and reason for this effect is unknown, although research suggests that it may be due to the effects of female pheromones on other […]
The periodic blood that flows as a discharge from the uterus. Also called menorrhea, the time during which menstruation occurs is referred to as menses. The menses occurs at approximately 4 week intervals to compose the menstrual cycle.