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Middle cycle bleeding

Women could experience middle cycle bleeding which could be triggered by several factors. Most commonly it is so called “ovulation bleeding” but different hormonal dysfunctions, cervical abnormalities, some contraceptives and even pregnancy could cause middle cycle bleeding.

Middle cycle bleeding from vagina could be a result of local short uterine bleeding or bleeding from damaged cervix or bleeding from vaginal vessels.

In most cases middle cycle bleeding has red color (fresh blood), it is not intensive (usually light), it appears in the middle of menstrual cycle and it is short (1-2 days)

Middle cycle bleeding – ovulation

Ovulation bleeding usually occurs at around the time of ovulation – in most cases it appears on days 13-14-15-16 (expected ovulation days). In most cases ovulation bleeding looks like light red or brown spotting during few hours or 1-2 days (coincided with ovulation). Ovulation bleeding occurs at the moment of cyclic decline of estrogen levels (just before ovulation) – this estrogen decline is a normal part of cyclic hormonal fluctuations during monthly menstrual cycle. Sometimes during ovulation bleeding women experience pelvic pain or lower abdominal pain.

Mid cycle estrogen decline causes the endometrium (internal uterine lining) to shrink a little and cause bleeding. Some experts believe that ovulation bleeding could be a result of light cervical bleeding during ovulation – bleeding from proliferated cervical glands. Cervical glands proliferation happened every month in the middle of menstrual cycle and coincides with ovulation.

Middle cycle bleeding – hormonal disturbances

Uterine bleeding always correlates with hormonal fluctuations (mainly estrogen changes). Usually during normal healthy menstrual cycle after stop (finish) of menstruation estrogen levels begin to rise slowly and uterine lining begins to thicken (grow). Estrogen level rises most rapidly just before ovulation. Just before ovulation, estrogen drops quickly (at the time of ovulation when the egg leaves the ovary). After ovulation estrogen again continue rising gradually and falls second time before expected menstruation (causing menstrual flow).

Any hormonal changes and disturbances could reduce level of estrogen which may cause unexpected middle cycle bleeding.

Middle cycle bleeding

Middle cycle bleeding

Several hormonal dysfunctions could cause mid cycle bleeding or spotting:

Middle cycle bleeding – birth control pills

Birth control pills are well known and most common method of modern contraception but it is also well known contraceptive which often trigger side effects (most commonly unexpected not controlled uterine bleeding). During first few months birth control pills could cause bleeding or brown spotting between periods. This type of bleeding could also appear in the middle of menstrual cycle. Usually under influence of birth control pills level of estrogen fall down and uterine lining adjusts to hormonal changes. At the same time, missed pills provoke additional hormonal changes and could also trigger bleeding or spotting.

Middle cycle bleeding – IUD

Intrauterine contraceptive devices (IUDs) could also cause middle cycle bleeding. Ovulation estrogen decline combined with mechanical contacts of IUD with uterine lining could easily cause so called ovulation bleeding in the middle of menstrual cycle.

Middle cycle bleeding – cervical abnormalities

Sometimes middle cycle bleeding could be triggered by cervical abnormalities such as cervical polyps, cervicitis, vaginitis and cervical infections. In most cases it is happening because of damages cervical vessel.

Most dangerous cervical factor which could cause bleeding is cervical cancer.

Middle cycle bleeding – implantation bleeding

Very rare implantation bleeding could coincide with middle of menstrual cycle. In most cases implantation bleeding occurs close to expected regular menstrual period. Usually implantation bleeding appears 6 – 12 days after conception, so it is very unlikely that it would happen in the middle of cycle.


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