Heavy Periods: Causes, Clots, and When to Be Concerned

Heavy periods are not about "enduring it" but about specific measurable signs. If you have to change a pad every couple of hours and large clots appear in the blood, you have reason to find out what is going on. Below is where the line of normal lies and when a doctor is needed.

What counts as heavy periods

Menstruation is normal bleeding in which the uterus sheds its inner lining, the endometrium, and it comes out through the vagina along with blood. Periods usually last from three to seven days, and the cycle is counted from the first day of one period to the first day of the next.

The boundaries of "heaviness" are described through everyday signs rather than through sensations:

• a pad or tampon needs to be changed every 1–2 hours, or a menstrual cup emptied more often than the manufacturer recommends;
• you use two hygiene products at once, for example a pad and a tampon;
• your period lasts longer than 7 days;
• clots larger than about 2.5 cm come out;
• blood leaks onto clothing or bedding, and because of your period you give up your usual activities.

If you often feel tired or short of breath, this is also a sign described with heavy periods.

Menorrhagia and hypermenorrhea: what the terms mean

Menorrhagia, also called hypermenorrhea, is heavy menstruation in which blood loss exceeds the physiological norm in volume or in duration (longer than 7 days) with a regular interval of 21–35 days. Essentially it is the same phenomenon, and when talking with a doctor both words mean very heavy bleeding during your period. Lengthening of periods beyond 8 days is described separately.

Periods with clots

Clots larger than about 2.5 cm are among the signs of heavy periods — along with frequent changing of hygiene products, duration longer than 7 days, and blood leaking onto clothing or bedding.

If such discharge appears together with other signs of heavy periods, you should tell your doctor about this discharge.

Causes of heavy periods

Sometimes heavy periods are a variant of normal: they can be heavier at the start of menstrual life, after pregnancy, and closer to menopause. Menstrual function usually becomes established at 9–15 years of age and continues until menopause, which most often occurs at 45–55 years of age.

Among the causes are diseases of the uterus and ovaries — uterine fibroids, endometriosis, adenomyosis, inflammatory processes of the pelvic organs, polycystic ovary syndrome. Heavy periods occur in conditions that make blood clot less well, for example von Willebrand disease. Certain medications can have an effect, including anticoagulants and chemotherapy. Rarely, heavy periods turn out to be a sign of uterine cancer.

Reviews of the causes of menorrhagia mention liver dysfunction, thyroid disorders (hypothyroidism), deficiency of vitamins involved in clotting, hormonal medications, aspirin, and intrauterine contraception. If you use an intrauterine device and have noticed that the bleeding has become heavier, tell your doctor about it.

Why heavy periods are dangerous and how diagnosis is carried out

Fatigue and shortness of breath are described as signs of heavy periods, and iron deficiency anemia as a possible consequence of regular heavy blood loss. Menorrhagia reduces working capacity and quality of life, so it is not considered "just an inconvenience."

At an appointment, the doctor will ask about your cycle, the duration and nature of the bleeding, about symptoms and the medications you take. A period calendar helps you notice changes. If the heaviness persists or the doctor suspects a disease, you will be referred for an examination or to a specialist. Possible tests include blood tests, for example for iron deficiency anemia.

When to see a doctor urgently

You should see a gynecologist routinely if your periods affect your life, if they are heavy for a long time, if you feel severe pain, notice bloody discharge between periods or after sex, and also if heavy periods are accompanied by pain when urinating, defecating, or during sex.

Heavy periods on their own are not a reason to call an ambulance; 103 or 112 — for a life-threatening condition.

This material is for reference: it helps you prepare for a conversation with a doctor but does not replace a consultation — only a specialist can assess your situation as a whole.

This content is for reference and does not replace a doctor's consultation. Medical disclaimer