Long Menstrual Periods: Why Your Period Won't Stop

What counts as a long period

Most periods last 3 to 7 days. The FIGO system that gynecologists use calls bleeding of more than 8 days "prolonged menstrual bleeding". Many doctors and patients use 7 days as the practical cut-off. Light brown spotting for a day or two at the end usually counts as part of the period.

Long periods are about duration. Periods with a high volume of blood are covered on heavy menstrual bleeding, and the two often overlap. The word menorrhagia has traditionally been used for both prolonged and heavy periods.

Why periods last longer than normal

No ovulation

In a normal cycle, ovulation is followed by progesterone, which stabilizes the uterine lining so that it sheds quickly and completely. Without ovulation, the lining keeps building under estrogen and then breaks down unevenly, causing long, often heavy or irregular bleeding. This happens:

• in the first few years after periods start
• in perimenopause, in the 40s
• with polycystic ovary syndrome
• with thyroid disease, high prolactin, significant weight change, intense exercise and stress

Structural causes

• Uterine fibroids, especially those that bulge into the cavity
• Endometrial polyps, which often cause long periods with spotting before or after
• Adenomyosis, with heavy, painful, prolonged periods
• A cesarean scar defect (niche): blood collects in a pocket at the scar and causes prolonged brown spotting after periods
• Endometrial hyperplasia or cancer, mainly over 45

Contraception and medicines

• The contraceptive implant and progestin-only injection commonly cause prolonged, unpredictable bleeding, especially in the first months.
• The copper IUD can lengthen periods.
• Blood thinners prolong bleeding.

Bleeding disorders

Von Willebrand disease and other clotting problems cause long, heavy periods, usually from the first period onward.

Pregnancy-related causes

A miscarriage, retained tissue after a miscarriage or abortion, or an ectopic pregnancy can cause prolonged bleeding. Always take a pregnancy test if you could be pregnant.

Effects of long periods

• Iron deficiency and anemia: tiredness, breathlessness, pale skin and headaches.
• Disruption to work, sleep, exercise and sex.
• Skin irritation from prolonged pad use.

How doctors find the cause

Expect questions about how long and how heavy your periods are, cycle length, contraception, pregnancy possibility and bleeding symptoms. A 2 to 3 month bleeding diary helps. Tests include a pregnancy test, blood count and ferritin, thyroid function, sometimes clotting studies, and a transvaginal ultrasound. An endometrial biopsy or hysteroscopy is recommended for people over 45, with risk factors such as obesity or PCOS, or when bleeding does not respond to treatment.

Treatment

• To stop a current long bleed: a short course of progestin tablets or high-dose combined hormonal pills, prescribed by a doctor, usually stops bleeding within a few days.
• To prevent future long periods: combined hormonal contraception, cyclical progestins, or a levonorgestrel IUD.
• Tranexamic acid on bleeding days for heavy, long periods.
• NSAIDs such as ibuprofen or naproxen during the period, following the label dose.
• Implant-related bleeding: a doctor may prescribe a short course of a combined pill or NSAID to settle it.
• Removing polyps or fibroids, or treating a cesarean niche.
• Iron supplements if iron is low.

Frequently asked questions

Why is my period lasting so long?

The commonest reasons are hormonal changes that stop ovulation (in teens, perimenopause and PCOS), fibroids, polyps, adenomyosis, hormonal contraception such as the implant, and bleeding disorders. Pregnancy complications are possible if you could be pregnant. A doctor can find the cause with simple tests.

Is a period lasting 2 weeks normal?

No. Bleeding for 14 days is longer than normal and should be checked, especially if it happens more than once or is heavy. It is common with perimenopause, PCOS and the contraceptive implant, but polyps, fibroids and other causes need to be excluded.

How can I stop a long period?

A doctor can prescribe progestin tablets or hormonal pills that usually stop bleeding within days. Tranexamic acid and NSAIDs reduce flow. Long-term, a hormonal IUD or pill can prevent prolonged periods. Seek emergency care if bleeding is very heavy or you feel faint.

Is menorrhagia the same as a long period?

The term menorrhagia traditionally covers periods that are heavy, prolonged, or both. Many doctors now prefer the terms heavy menstrual bleeding for volume and prolonged menstrual bleeding for periods lasting more than 8 days.