A normal period lasts up to 7 days. If yours has started running longer than it used to, here’s what can cause it, and when to see a doctor.
A period lasting longer than usual means one of two things: it’s running longer than your own normal (for example, 4 days has become 7), or it lasts more than 7 days. A change from your normal is worth noticing. More than 7 days is too long for anyone and should be checked. Common causes include hormone shifts in perimenopause, skipped ovulation, fibroids or polyps, and some types of birth control.
How long is a normal period?
A normal period lasts about 2 to 7 days. Most women bleed most heavily in the first two days, then taper. Your own pattern matters too: if your period has run 4 days for years and is suddenly running 7 or 8, that change is worth noting even before it crosses the 7-day line.
When to see a doctor
- Your period lasts more than 7 days.
- You soak through a pad or tampon every 1 to 2 hours for several hours, need to double up, or wake at night to change.
- You pass clots larger than a quarter.
- You feel unusually tired, short of breath or dizzy, which can be signs of anemia from blood loss.
- Your periods have become noticeably longer or heavier over a few cycles.
- You’re 45 or older and your bleeding pattern has changed.
- You have any bleeding after menopause.
Seek urgent care if you’re soaking a pad or tampon every hour for two hours or more, feel faint, or could be pregnant and have heavy bleeding or pain.
Why is my period lasting longer than usual?
- A cycle without ovulation. When you don’t ovulate, your body makes no progesterone that month, so the uterine lining keeps building and then sheds slowly and unevenly. This is common in perimenopause, with PCOS (now called PMOS), after big stress or weight changes, and in the first years after periods start. See Low Progesterone Symptoms.
- Perimenopause. In your 40s, cycles often swing between short and long, and some periods last longer and run heavier. See Perimenopause Irregular Periods: What’s Normal.
- Fibroids or polyps. These usually benign growths in the uterus are a common cause of longer, heavier periods.
- Adenomyosis, where the uterine lining grows into the muscle wall, often with painful, heavy periods.
- Birth control changes. A copper IUD can make periods longer and heavier, especially in the first months. Starting, stopping or switching hormonal methods can also change bleeding for a while.
- Thyroid problems, especially an underactive thyroid.
- Medicines such as blood thinners.
- A bleeding disorder, such as von Willebrand disease, especially if your periods have always been long and heavy, or you bruise or bleed easily.
- Pregnancy-related bleeding, such as an early miscarriage. If you could be pregnant, take a test.
- Less commonly, thickening of the uterine lining (endometrial hyperplasia) or cancer, which is more likely after 45 and is why longer bleeding at that age should be checked.
Period lasting 2 weeks
Bleeding for two weeks is not a normal period and should be checked, even if it’s light. Often the cause is a cycle without ovulation, especially in perimenopause, but a doctor will want to rule out polyps, fibroids, pregnancy-related bleeding and changes in the lining.
If the bleeding is on and off rather than continuous, see Bleeding Between Periods.
What your doctor may check
- Questions about your cycle, birth control, medicines and family history of bleeding.
- A pregnancy test.
- Blood tests: blood count and iron (for anemia), thyroid, and sometimes clotting tests.
- A pelvic exam and ultrasound to look for fibroids or polyps.
- Sometimes a small sample of the uterine lining, more often after age 45.
Treatment depends on the cause. Options range from medicines that reduce bleeding, such as ibuprofen taken during the period or tranexamic acid, to hormonal treatments and, for fibroids or polyps, procedures to remove them. Iron can treat anemia.
What you can do now
- Track two or three periods. Note the start and end dates, how often you change pads or tampons on your heaviest day, and any clots.
- Watch for tiredness. If you feel worn out or breathless, ask your doctor to check your iron.
- Keep the basics steady. Regular meals, steady sleep and managing stress support more regular ovulation. How to Regulate Periods Naturally covers these steps.
The traditional Chinese medicine view
Traditional Chinese Medicine calls a period that won’t stop on time jing qi yan chang. It is often described as Qi too weak to contain the blood, with pale, thin bleeding and tiredness; as heat in the blood, with brighter red bleeding and restlessness; or as blood stasis, with darker blood, clots and cramping. These are traditional descriptions, not a diagnosis, and the medical checks above come first.
Once other causes are ruled out
If your doctor finds no fibroids, polyps or other cause, and your longer periods are part of a cycle that also runs early, late or unpredictably, CycleBalance is one option to discuss. It is a sealed herbal pouch worn over the navel, held by a reusable belt and replaced every five days. It does not treat fibroids, polyps, bleeding disorders or anemia, and it is not a substitute for being checked. There are no controlled studies of it, and no practice records specific to long periods are presented here.
See CycleBalance’s directions →
Quick answers
Is a 7-day period normal?
Yes. Up to 7 days is within the normal range. More than 7 days should be checked.
Can stress make my period last longer?
It can, by disrupting ovulation. If it happens once and settles, it’s usually not a concern. If it repeats, see your doctor.
Why is my period lasting longer than usual in my 40s?
Perimenopause is a common reason, but longer bleeding after 45 should still be checked to rule out other causes.
Reviewed October 2026. Author: Qingcai Wang, MD, PhD, developer of the Five Essences external herbal-pouch formulations, with a commercial interest in their sale. General education only; continue your medical care.
Sources: American College of Obstetricians and Gynecologists, Heavy Menstrual Bleeding; ACOG, Abnormal Uterine Bleeding; NHS, Periods.
The routine behind this article
CycleBalance is the Five Essences external herbal pouch matched to this topic — worn on the body, nothing swallowed. One course is six pouches (about 30 days), with a fresh pouch every five days. $199 per course; the reusable belt is $15 if you don’t have one. Every first course is covered by the 90-Day First-Course Satisfaction Guarantee.
Wellness support, not medical care.
This article is part of our Women’s Core Health guide — cycle, fertility and postpartum, in one place.