Heavy or Abnormal Periods: When to See an OB-GYN

See an OB-GYN if your period soaks through a pad or tampon every hour for several hours, lasts more than 7 days, includes clots the size of a quarter, or you bleed between periods, after sex, or after menopause. Heavy and abnormal bleeding is common, the causes are usually treatable, and a straightforward workup can sort it out. At Legacy OB/GYN in Frisco, TX, most of what we see has a common, manageable explanation.

Periods are not all the same, and most people's cycles shift a little over the years. So how do you know when a heavy or irregular period is just your normal, and when it is worth getting checked? Here is how to tell the difference, what tends to cause it, and when to come in.

What counts as a heavy period?

A normal menstrual cycle runs about 21 to 35 days, and a period generally lasts up to 7 days. Your flow is considered heavy if you notice any of these:

• Bleeding that soaks through one or more pads or tampons every hour for several hours in a row
• Needing to wear more than one pad at a time, or to double up on protection
• Getting up at night to change a pad or tampon
• Bleeding that lasts more than 7 days
• Passing blood clots the size of a quarter or larger

You do not need to hit every item on that list. Any one of them is reason enough to mention it at a visit. Heavy menstrual bleeding is one of the most common concerns women bring to a gynecologist, affecting roughly one in five women, so if this sounds like you, you are far from alone.

There is also a more subjective test that matters: if your period regularly keeps you from work, school, exercise, or your usual day, that is heavy enough to talk about, even if the numbers above do not quite fit.

What makes bleeding "abnormal"?

Heavy flow is one kind of abnormal bleeding. There are others worth knowing, because they are easy to overlook. Bleeding is considered abnormal when you have:

• Bleeding or spotting between periods
• Bleeding or spotting after sex
• Cycles shorter than 21 days or longer than 35 days
• Periods that suddenly become much heavier or longer than your usual
• Any bleeding after menopause

That last one deserves its own line. Bleeding after menopause is never a normal part of your cycle, and it always needs to be evaluated, even if it is light. It is usually caused by something benign, but it is also the most common sign of endometrial cancer in women past menopause, which is highly treatable when caught early. Getting it checked is the move every time. If you are in the years before menopause and your cycle is shifting, our guide on perimenopause vs. menopause explains which changes are expected and which are not.

What causes heavy or abnormal periods?

Most causes are common and not dangerous. The frequent ones include:

• Hormone shifts. Cycles where the ovaries do not release an egg can let the uterine lining build up and then shed heavily. This is common in the teen years and again in perimenopause, and in conditions like PCOS and an underactive thyroid.
• Fibroids and polyps. These are noncancerous growths in or on the uterus, and both can cause heavier or irregular bleeding.
• Adenomyosis. Uterine-lining tissue grows into the muscle wall, often causing heavy, painful periods that tend to worsen with age.
• A bleeding disorder. If you have had heavy periods since your very first one, your blood may not clot as it should. This is more common than people expect, and it is testable.
• Certain medications or devices. Blood thinners, aspirin, and a copper IUD can all increase flow.

Less often, abnormal bleeding points to something that needs prompt attention, including a pregnancy-related cause or, in some cases, a precancerous or cancerous change in the uterine lining. That is exactly why a workup is worth doing rather than waiting it out. Our abnormal bleeding service page covers how we evaluate it, and the uterine fibroids page explains the options when fibroids are the cause.

When is heavy bleeding an emergency?

Most heavy bleeding can be handled with a regular appointment. Some situations cannot wait.

Seek emergency care right away if you are soaking through a pad or tampon every hour for two or more hours in a row, especially if you also have chest pain, shortness of breath, or feel lightheaded or dizzy. Those together can signal that you are losing blood faster than your body can keep up with.

During office hours, you can also call us at (972) 731-6565 and we will help you decide whether you need to be seen that day or can come in soon.

How is it treated?

Treatment starts with finding the cause, and the first steps are simple. At Legacy OB/GYN in Frisco, TX, a typical workup includes a careful history of your cycles, a pelvic exam, and bloodwork to check for anemia and, when it fits the picture, thyroid or clotting issues. A pelvic ultrasound is common when imaging will help, and a sample of the uterine lining is taken when that is the right next step.

From there, many people do well with medication. Options range from hormonal birth control methods that lighten or regulate periods, to a non-hormonal prescription called tranexamic acid taken during your period, to anti-inflammatory medicines like ibuprofen that can reduce both flow and cramps. If you are weighing a method that also lightens periods, our birth control options compared guide lays out how each one performs. If medication is not enough, procedures such as removing a polyp or fibroid, or other targeted treatments, may be discussed. The right plan depends on your cause, your symptoms, and whether you may want to get pregnant in the future, so it is a conversation, not a one-size-fits-all answer. When surgery comes up, our piece on hysterectomy alternatives covers the uterus-sparing options worth knowing.

Bring this to your visit

A few minutes of notes before your appointment makes the whole conversation easier. It is worth bringing:

• The dates your last few periods started and how many days each lasted
• A rough sense of your heaviest days, such as how often you changed a pad or tampon
• Whether you have had any spotting between periods or after sex
• Any new tiredness, dizziness, or shortness of breath
• The questions on your mind, including whether you need any tests and what your options are

If heavy or abnormal periods have been part of your normal for a while, you do not have to keep living around them. You can read more about our team, then call Legacy OB/GYN at (972) 731-6565 or book online to get it sorted out.

Frequently asked questions

How do I know if my period is too heavy? Common signs of a heavy period include soaking through a pad or tampon every hour for several hours in a row, needing to double up on protection, getting up at night to change protection, bleeding for more than 7 days, or passing clots the size of a quarter or larger. If your period regularly keeps you from your normal activities, that is also worth a conversation.

Is it normal to bleed between periods? Spotting or bleeding between periods, after sex, or after menopause is not a normal part of a healthy cycle and should be checked. It is often caused by something benign like a polyp or a hormone shift, but bleeding after menopause in particular always needs to be evaluated.

When is heavy bleeding an emergency? If you are soaking through a pad or tampon every hour for two or more hours in a row, and you also feel chest pain, shortness of breath, lightheadedness, or dizziness, seek emergency care right away. During office hours you can call Legacy OB/GYN at (972) 731-6565.

Can heavy periods make me anemic? Yes. Losing more blood than usual month after month can lead to iron-deficiency anemia, which can leave you feeling tired, weak, or short of breath. A simple blood test can check for it, and it is treatable.

Sources

1. American College of Obstetricians and Gynecologists. "Heavy Menstrual Bleeding." 2024. https://www.acog.org/womens-health/faqs/heavy-menstrual-bleeding
2. American College of Obstetricians and Gynecologists. "Abnormal Uterine Bleeding." 2025. https://www.acog.org/womens-health/faqs/abnormal-uterine-bleeding
3. American College of Obstetricians and Gynecologists. "Perimenopausal Bleeding and Bleeding After Menopause." 2024. https://www.acog.org/womens-health/faqs/perimenopausal-bleeding-and-bleeding-after-menopause
4. Centers for Disease Control and Prevention. "About Heavy Menstrual Bleeding." 2024. https://www.cdc.gov/female-blood-disorders/about/heavy-menstrual-bleeding.html
5. Mayo Clinic. "Heavy Menstrual Bleeding: Symptoms and Causes." 2023. https://www.mayoclinic.org/diseases-conditions/menorrhagia/symptoms-causes/syc-20352829

This article is general education and not a substitute for personal medical advice. For guidance about your own situation, talk with your OB-GYN.

Medically reviewed by Hina Khan, MD, FACOG.