Irregular periods are pretty common – up to 25 percent of women experience them. But that doesn’t mean women have to simply deal with them.
Irregular periods can be confusing – and sometimes concerning – especially when your cycle suddenly changes or doesn’t follow a predictable pattern. While occasional shifts are often normal, ongoing irregularity can signal hormone imbalances, stress, underlying health conditions or changes related to life stages like adolescence, postpartum or perimenopause. Understanding what’s normal for your body is the first step toward protecting your reproductive health.
If your periods are unpredictable, unusually heavy or absent, make an appointment with an OB-GYN to discover what could be the cause.
When is a period irregular?
A menstrual cycle is counted from the first day of one period to the first day of the next. A normal cycle comes every 21 to 35 days and lasts two to seven days.
A period is considered irregular when it falls outside these ranges. Here are the signs to look for:
- Cycles shorter than 21 days or longer than 35 days
- Bleeding that lasts longer than seven days
- Unexpected bleeding (called spotting) between periods
- No period for three or more months
“Many women don’t realize that they do not have to suffer through painful, heavy or irregular periods,” says Coral Spicer, MD, board-certified OB-GYN and urogynecologist in our Springfield market.
If any of these sound like you, it’s a good idea to talk to your OB-GYN. An irregular period isn’t just about your reproductive health – it’s a sign to look deeper into your overall health.
What causes irregular periods?
Causes for irregular periods usually fall into one of three groups.
Medical and hormonal causes
Hormonal imbalances and medical conditions are some of the most common causes. These includes conditions like:
- Polycystic ovary syndrome (PCOS)
- Thyroid problems
- Premature menopause or ovarian failure
- Pregnancy or breastfeeding
- Eating disorders
- Rapid weight loss
- Working out too much
- Infections
Structural causes
Fibroids (non-cancerous growths in the uterus), polyps or masses on the ovaries can affect how regular and how heavy your periods are.
Tissue abnormalities
Endometriosis is when the cells on the inside of the uterus grow on the outside, too. This can lead to irregular periods along with other symptoms.
In some cases, unusual cells in the lining of the uterus can cause irregular bleeding. These cells can sometimes turn into cancer over time. This is one reason it’s important to get checked out – even if your symptoms don’t feel severe.
When should you see a provider about your period?
Menstruation varies from person to person, and sometimes even from cycle to cycle. However, it’s important to know when heavy or irregular periods cross the line into something to check out.
Heavy menstrual bleeding:
- Soaking through a pad or tampon every one to two hours
- Passing blood clots bigger than a quarter
- Periods lasting more than seven days
- Feeling dizzy or lightheaded during your period
Irregular period patterns:
- Cycles shorter than 21 days or longer than 35 days
- Spotting or bleeding between periods
- No period for three months or more
Severe period pain:
- Cramps or pelvic pain that make it hard to go to work, school or get through your day
If any of these sound familiar, you have options to make it better. Make an appointment with your OB-GYN to start the conversation.
How does a doctor diagnose irregular periods?
Your provider will use a few different tools to figure out what’s causing your irregular periods.
Here’s what Dr. Spicer says that process usually looks like:
- A conversation about your health history and a physical exam
- Blood tests to check hormone levels and thyroid function
- A pelvic ultrasound to look at your uterus and ovaries
Many women gather enough information from those three steps for a diagnosis. If your provider thinks there may be abnormal cells in your uterine lining, they may request more testing. That could include an endometrial biopsy, hysteroscopy or dilation and curettage (D&C).
How are irregular periods treated?
Treatment depends on what’s causing the problem. The good news is that there are many options – both with and without surgery.
Non-surgical treatments
- Prescription NSAIDs: Strong anti-inflammatory medicines can reduce cramping and heavy bleeding.
- Hormonal birth control: Pills, patches, rings, shots or IUDs can make periods lighter, shorter and less painful as well as help regulate your cycle.
- Cyclic progesterone: A hormone treatment that helps regulate your period and reduce heavy flow without stopping you from getting pregnant.
- Lysteda (tranexamic acid/TXA): A non-hormonal medicine that reduces heavy menstrual bleeding – a option for those who can’t or don’t want to use hormones.
“If medications have caused side effects or not worked well in the past, or if you are no longer a candidate for medication based on medical or family history, there are other options,” Dr. Spicer says. “You may be a candidate for other treatment options, including surgery.”
Surgical treatments
- Endometrial ablation: A procedure that removes the lining of the uterus to reduce heavy periods. Some women stop having periods completely. However, it doesn’t help with pain and it doesn’t work for everyone.
- Hysterectomy: Surgery to remove the uterus. This stops periods for good and usually helps with pain that comes from the uterus. If your surgeon leaves your ovaries, your hormone levels stay the same.
Finding the right treatment depends on your situation and goals. Talk to your doctor to find the right fit.
Frequently asked questions about irregular periods
What is considered an irregular period?
A period is considered irregular if your cycles are shorter than 21 days, longer than 35 days, last more than seven days or if you have bleeding between periods.
What is the most common cause of irregular periods?
Hormonal imbalances are among the most common causes. This includes conditions like polycystic ovary syndrome (PCOS) and thyroid problems. Structural issues like uterine fibroids can also make periods irregular.
When should I see a doctor for irregular periods?
See a doctor if your cycles are regularly outside the 21 to 35 day range, if you’re soaking through a pad or tampon every one to two hours, if your period lasts more than seven days or if the pain is getting in the way of your daily life.
Can irregular periods be treated without hormones?
Yes. Non-hormonal options include Lysteda (tranexamic acid) to reduce heavy bleeding and, in some cases, surgical choices like endometrial ablation. Talk to your OB-GYN to find the best fit for you.
How we can help
Irregular periods are common, but they’re not something you have to manage on your own. There are plenty of treatment options available to you that can relieve pain, regulate your cycle and manage other side effects.
Your provider can evaluate symptoms like missed periods, heavy or prolonged bleeding, spotting between periods or cycle changes tied to stress, weight shifts or life stages. Schedule an appointment with your OB-GYN to get guidance and compassionate care tailored to you.
Learn about the gynecology, obstetrics and women’s health services we offer at Mercy Health.
