Table of ContentsView AllTable of ContentsFluctuating HormonesThyroid ProblemsBirth ControlEndometriosisPolyps or FibroidsWeight GainStressPIDCancerWhen to See a Provider
Table of ContentsView All
View All
Table of Contents
Fluctuating Hormones
Thyroid Problems
Birth Control
Endometriosis
Polyps or Fibroids
Weight Gain
Stress
PID
Cancer
When to See a Provider
Getting two periods in one month is often due to something simple and harmless. For some, it may even be their norm. The typicalmenstrual cycleis 28 days, but 24- to 38-day cycles fall within the normal range.
Occasionally shorter menstrual cycles can be due to stress, perimenopause, forgetting your birth control pill, and pregnancy.
However, frequent short menstrual cycles can sometimes indicate an underlying health problem that should be evaluated. Thyroid disease, endometriosis, uterine fibroids, and cancer can cause shorter menstrual cycles or mid-cycle bleeding.
1. Fluctuating Hormones
The average menstrual cycle is 28 days. However, normal menstrual cycles can be as short as 24 days and as long as 38 days.
People with cycles on the low end of normal may get 15 periods a year. In that case, menstruating twice in a calendar month will happen about three times a year.
Shorter cycles are also more common when you first start menstruating and as you approach menopause.
During your teen years, cycles are often irregular because of all the hormone changes that are taking place. Your cycles may normalize in your 20s or 30s, only to once again become irregular in your 40s and early 50s as you make the transition tomenopause.
Do you ovulate if you get your period twice a month?You may not ovulate if you have short menstrual cycles and get two periods in one month. Research has shown that this is particularly true if your cycle is shorter than 25 days.
Do you ovulate if you get your period twice a month?
You may not ovulate if you have short menstrual cycles and get two periods in one month. Research has shown that this is particularly true if your cycle is shorter than 25 days.
Pregnancy
Irregular bleeding is common in early pregnancy. If you are sexually active and have menstrual bleeding twice in one month, you could be pregnant.
If you suspect you may be pregnant, take an at-home pregnancy test. If negative, wait a few days before retesting.
Puberty
The average age to start menstruating is 12, but a first period can come anywhere between 8 and 15.
For the first few years, your periods might be irregular because of constantly shifting hormones. Teenage menstrual cycles can last anywhere from 21 to 45 days.This can cause two periods in one month.
These early fluctuations are usually not a cause for concern. However, if you don’t get more regular over time, talk to a healthcare provider.
If there’s no underlying condition causing frequent or irregular periods, a provider may prescribeoral contraceptives (birth control pills)to regulate your cycle.
Verywell / Ellen Lindner
Perimenopause
Perimenopausehappens when you are transitioning to but have not yet reached menopause. (Menopause begins when you haven’t had a period for 12 months in a row.)
During this time, yourestrogenlevels drop. That can make your cycle irregular and your periods more (or less) frequent—possibly causing two periods in one month.Theblood flow may also be shorter or longer,lighter or heavier.
Most people with female reproductive organs start this phase between their late 30s and mid-40s. The process generally lasts for about eight to 10 years before menopause begins.
Some people have early (before age 45) orpremature (before age 40) menopause. Changes in period frequency can be a sign that you’re entering one of these phases.
If period changes are related to perimenopause, you might be able to regulate them withbirth control pills, patches, or rings.
Bleeding After MenopauseVaginal bleedingaftermenopauseis not normal. It can be a sign of serious disease, including endometrial cancer. Call your healthcare provider right away if you’re postmenopausal and have any vaginal bleeding or abnormal discharge.
Bleeding After Menopause
Vaginal bleedingaftermenopauseis not normal. It can be a sign of serious disease, including endometrial cancer. Call your healthcare provider right away if you’re postmenopausal and have any vaginal bleeding or abnormal discharge.
2. Thyroid Problems
Your thyroid gland and the hormones it makes are important for regulating your menstrual cycle.
Too much thyroid hormone (hyperthyroidism) or not enough (hypothyroidism) can cause shorter menstrual cycles.
With hypothyroidism, your periods can be very heavy or more frequent, such as two periods in a month. You may need to change your pad, tampon, or cup every hour or double up your protection (such as wearing a tampon and pad). Your periods may also last longer than a week.
Hyperthyroidism is more commonly associated with lighter, less frequent periods. However, too much thyroid hormone can also shorten the luteal (post-ovulation) phase.This may cause you to menstruate twice in one month.
3. Skipping or Stopping Birth Control
Oral contraception (birth control pills) suppresses your normal menstrual cycle with hormones that keep your body from ovulating.
The same thing can happen when you go off of the pill or even miss just a pill or two. This can happen even if you’ve had a recent period, leading to two periods in one month.
Your body can also react this way if you make a mistake with another form of hormonal birth control like the birth control patch or the ring.
The right way to restart birth control after missing one or more doses depends on the type. Always read the information that comes with your pills. You can also ask your provider or pharmacist what to do if you forget a pill.
Forget a Pill?If you miss a pill, you need to use abackup method of contraceptionoremergency contraceptionto avoid an unintended pregnancy.
Forget a Pill?
If you miss a pill, you need to use abackup method of contraceptionoremergency contraceptionto avoid an unintended pregnancy.
4. Endometriosis
Endometriosisis a medical condition that causes tissue that’s similar to the endometrium to grow in other parts of the body.
The main symptoms of endometriosis are painful periods, excessive bleeding, and short menstrual cycles—which could mean having two periods in one month.People with endometriosis have extra and more severe periods in part because the endometrium has overgrown, which means there’s more of it to be shed.
If you have endometriosis, you might also have bleeding and pain when you ovulate because the tissue can stick to the ovaries and form cysts.Other symptoms of endometriosis include:
Endometriosis can sometimes be managed with low-dose birth control pills or other hormone therapies.
Surgery to remove the lesions may help, but the tissue often comes back. Some people with endometriosis have their uterus and/or ovaries removed (hysterectomyandoophorectomy).
5. Uterine Polyps or Fibroids
Uterine polyps and fibroids are non-cancerous growths on the uterus.
Uterine polyps(also called endometrial polyps) are soft growths in the uterus or cervix. They can be as small as a sesame seed or larger than a golf ball.
You can have one or multiple polyps, which are usually not cancerous. They’re more common with age and rare in people under 20.
Symptoms of uterine polyps include:
Uterine fibroidsare growths in the muscle tissue rather than the endometrium. They’re also calledleiomyomasor myomas.
Fibroids can be inside or outside the uterus. As with polyps, you can have one or several.Symptoms ofuterine fibroidsinclude:
Both polyps and fibroids can cause problems with your menstrual cycle. You may have more frequent periods (including two periods in one month), longer and heavier periods, and bleeding between periods.
Thetreatment for polyps and fibroidsranges fromsymptom managementand hormonal therapies to surgical removal of the growths. In more serious cases, people need to have a hysterectomy.
Uterine growths can also affect your fertility and may even cause miscarriages.
6. Weight Gain or Obesity
Rapid weight gain can throw off your cycle. That’s because it affects the part of your brain that regulates hormones (thehypothalamus).This can lead to hormonal fluctuations that may cause two periods in one month or infrequent periods.
Obesity has a complex relationship with menstruation. High levels of fat (adipose tissue) can upset the balance of sex hormones and lead to excess estrogen.
Too much estrogen can make you haveshort menstrual cyclesand more periods. Hormonal imbalances can also cause heavier bleeding, more cramps, and longer-lasting pain during your period.
Menstrual changes related to weightare most severe when the extra fat is mostly around the belly.
Losing weight and maintaining a healthy weight for your body can help keep your menstrual cycle regular. If you need help losing weight, talk to your provider about your options.
7. Stress
Changes in your day-to-day routine can affect your menstrual cycle. That said, stress can cause you to have periods twice in one month or for you to get your period early.
Perceived stress can throw off the hypothalamus and lead to the release of excess stress hormone (cortisol).
All thatextra cortisolchanges your body’s ability to regulate hormones, which can lead to irregular menstrual cycles and either more or fewer periods.
Typically, getting back to your normal routine will also get your cycle back on track.
8. Pelvic Inflammatory Disease
Pelvic inflammatory disease (PID) is an infectious illness. It occurs whennormal vaginal bacteriaor sexually transmitted infections (STIs)—especiallychlamydiaandgonorrhea—move from the vagina up to the:
The risk of PID is higher when:
PID can cause irregular menstrual cycles, including two periods in one month or spotting and cramping between periods.
Other symptoms of PID include:
Repeated bouts of PID can cause scarring on thefallopian tubesthat can lead tochronic pelvic pain,ectopic pregnancy, and infertility.
It’s important to get PID treated as soon as possible. While antibiotics can clear up the infection, it won’t heal the damage to your reproductive organs.
9. Cancer
It’s not as common as other reasons, but menstrual changes (including two periods in one month) can sometimes be a sign of cancer.
Cancers of the reproductive organs, including the uterus, cervix, and ovaries, can change your hormones and menstrual cycle.
Uterine cancercan cause you to have periods more often.Cervicalandovarian cancersare more often associated with long and heavy periods rather than more frequent periods.
Uterine Cancer
Two types of cancer are possible in your uterus:
Either type of cancer can cause more frequent periods that might also be very long and heavy—especially if you’re over the age of 40.
These cancers can also cause bleeding between periods and spotting or bleeding after menopause.
Other symptoms of reproductive cancers include:
The treatment for uterine cancer depends on the type you have and how healthy you are. A few options include:
When to See a Healthcare Provider
While some of the causes of frequent periods are not serious and don’t need treatment, don’t assume that’s the case if you have two periods in one month.
Call your provider if:
By doing so, you may catch a problem early and start the treatment you need. If there isn’t a problem, your provider can put your mind at ease and help figure out what you need to do to get your cycle back on track.
Tracking Your PeriodIt can be helpful to show your provider a record of when your most recent periods started and stopped. As youtrack your period, also note symptoms such as pain, heavier blood flow, fatigue, weight gain, or fever. This information can help your healthcare provider narrow down the possible causes of your period changes.
Tracking Your Period
It can be helpful to show your provider a record of when your most recent periods started and stopped. As youtrack your period, also note symptoms such as pain, heavier blood flow, fatigue, weight gain, or fever. This information can help your healthcare provider narrow down the possible causes of your period changes.
Summary
Shorter menstrual cycles are not necessarily a sign that something is wrong. For some people, they’re normal. However, if you’re usually regular and suddenly have two periods in one month—and the cause isn’t obvious—talk to your provider.
Many things can make your period come more often than usual. Natural hormone fluctuations can cause this, as can missing a birth control pill and lifestyle factors like being overweight or stressed.
Having your period twice in one month could also be a sign of a medical condition that needs treatment.
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Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read oureditorial processto learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
Department of Health and Human Services Office on Women’s Health.Your menstrual cycle.Wesselink AK, Wise LA, Hatch EE, et al.Menstrual cycle characteristics and fecundability in a North American preconception cohort.Ann Epidemiol. 2016;26(7):482-487.e1. doi:10.1016/j.annepidem.2016.05.006Icahn School of Medicine at Mount Sinai.Vaginal bleeding in early pregnancy.Icahn School of Medicine at Mount Sinai.Vaginal bleeding between periods.Icahn School of Medicine at Mount Sinai.Vaginal bleeding – hormonal.National Institute of Child Health and Human Development.What are the common treatments for menstrual irregularities?.American College of Obstetricians and Gynecologists.Perimenopausal bleeding and bleeding after menopause.Department of Health and Human Services Office on Women’s Health.Early or premature menopause.Delamater L, Santoro N.Management of the perimenopause.Clin Obstet Gynecol. 2018;61(3):419-432. doi:10.1097/GRF.0000000000000389American Cancer Society.Signs and symptoms of endometrial cancer.Department of Health and Human Services Office on Women’s Health.Thyroid disease.Jacobson MH, Howards PP, Darrow LA, et al.Thyroid hormones and menstrual cycle function in a longitudinal cohort of premenopausal women.Paediatr Perinat Epidemiol. 2018;32(3):225–234. doi:10.1111/ppe.12462University of Iowa Hospitals & Clinics.Combination birth control (COC) pills.Planned Parenthood.Will missing my birth control mess up my period?National Women’s Health Network.How does endometriosis affect my menstrual cycle?Endometriosis Foundation.Endometriosis symptoms: abnormal periods.Brigham and Women’s Hospital.Uterine polyps overview.Nijkang NP, Anderson L, Markham R, Manconi F.Endometrial polyps: pathogenesis, sequelae and treatment.SAGE Open Med. 2019;7:2050312119848247. doi:10.1177/2050312119848247Tarney CM, Han J.Postcoital bleeding: a review on etiology, diagnosis, and management.Obstet Gynecol Int. 2014;2014:192087. doi:10.1155/2014/192087American College of Obstetricians and Gynecologists.Uterine fibroids: frequently asked questions.Ko KM, Han K, Chung YJ, Yoon KH, Park YG, Lee SH.Association between body weight changes and menstrual irregularity: the Korea National Health and Nutrition Examination Survey 2010 to 2012.Endocrinol Metab (Seoul). 2017;32(2):248-256. doi:10.3803/EnM.2017.32.2.248Kafaei-Atrian M, Mohebbi-Dehnavi Z, Sayadi L, Asghari-Jafarabadi M, Karimian-Taheri Z, Afshar M.The relationship between the duration of menstrual bleeding and obesity-related anthropometric indices in students.J Educ Health Promot. 2019;8:81. doi:10.4103/jehp.jehp_24_18Bae J, Park S, Kwon JW.Factors associated with menstrual cycle irregularity and menopause.BMC Womens Health. 2018;18(1):36. doi:10.1186/s12905-018-0528-xVigil P, Meléndez J, Soto H, Petkovic G, Bernal YA, Molina S.Chronic stress and ovulatory dysfunction: implications in times of COVID-19.Front Glob Womens Health. 2022;3:866104. doi:10.3389/fgwh.2022.866104University of Michigan, Michigan Medicine.Symptoms of pelvic infection.American Academy of Family Physicians.Pelvic inflammatory disease.American College of Obstetricians and Gynecologists.Pelvic inflammatory disease (PID).Memorial Sloan Kettering Cancer Center.Uterine (endometrial) cancer signs & symptoms.University of Pennsylvania Medical School.Irregular periods: Why is my period late?Nemours Foundation.Irregular periods.
Department of Health and Human Services Office on Women’s Health.Your menstrual cycle.
Wesselink AK, Wise LA, Hatch EE, et al.Menstrual cycle characteristics and fecundability in a North American preconception cohort.Ann Epidemiol. 2016;26(7):482-487.e1. doi:10.1016/j.annepidem.2016.05.006
Icahn School of Medicine at Mount Sinai.Vaginal bleeding in early pregnancy.
Icahn School of Medicine at Mount Sinai.Vaginal bleeding between periods.
Icahn School of Medicine at Mount Sinai.Vaginal bleeding – hormonal.
National Institute of Child Health and Human Development.What are the common treatments for menstrual irregularities?.
American College of Obstetricians and Gynecologists.Perimenopausal bleeding and bleeding after menopause.
Department of Health and Human Services Office on Women’s Health.Early or premature menopause.
Delamater L, Santoro N.Management of the perimenopause.Clin Obstet Gynecol. 2018;61(3):419-432. doi:10.1097/GRF.0000000000000389
American Cancer Society.Signs and symptoms of endometrial cancer.
Department of Health and Human Services Office on Women’s Health.Thyroid disease.
Jacobson MH, Howards PP, Darrow LA, et al.Thyroid hormones and menstrual cycle function in a longitudinal cohort of premenopausal women.Paediatr Perinat Epidemiol. 2018;32(3):225–234. doi:10.1111/ppe.12462
University of Iowa Hospitals & Clinics.Combination birth control (COC) pills.
Planned Parenthood.Will missing my birth control mess up my period?
National Women’s Health Network.How does endometriosis affect my menstrual cycle?
Endometriosis Foundation.Endometriosis symptoms: abnormal periods.
Brigham and Women’s Hospital.Uterine polyps overview.
Nijkang NP, Anderson L, Markham R, Manconi F.Endometrial polyps: pathogenesis, sequelae and treatment.SAGE Open Med. 2019;7:2050312119848247. doi:10.1177/2050312119848247
Tarney CM, Han J.Postcoital bleeding: a review on etiology, diagnosis, and management.Obstet Gynecol Int. 2014;2014:192087. doi:10.1155/2014/192087
American College of Obstetricians and Gynecologists.Uterine fibroids: frequently asked questions.
Ko KM, Han K, Chung YJ, Yoon KH, Park YG, Lee SH.Association between body weight changes and menstrual irregularity: the Korea National Health and Nutrition Examination Survey 2010 to 2012.Endocrinol Metab (Seoul). 2017;32(2):248-256. doi:10.3803/EnM.2017.32.2.248
Kafaei-Atrian M, Mohebbi-Dehnavi Z, Sayadi L, Asghari-Jafarabadi M, Karimian-Taheri Z, Afshar M.The relationship between the duration of menstrual bleeding and obesity-related anthropometric indices in students.J Educ Health Promot. 2019;8:81. doi:10.4103/jehp.jehp_24_18
Bae J, Park S, Kwon JW.Factors associated with menstrual cycle irregularity and menopause.BMC Womens Health. 2018;18(1):36. doi:10.1186/s12905-018-0528-x
Vigil P, Meléndez J, Soto H, Petkovic G, Bernal YA, Molina S.Chronic stress and ovulatory dysfunction: implications in times of COVID-19.Front Glob Womens Health. 2022;3:866104. doi:10.3389/fgwh.2022.866104
University of Michigan, Michigan Medicine.Symptoms of pelvic infection.
American Academy of Family Physicians.Pelvic inflammatory disease.
American College of Obstetricians and Gynecologists.Pelvic inflammatory disease (PID).
Memorial Sloan Kettering Cancer Center.Uterine (endometrial) cancer signs & symptoms.
University of Pennsylvania Medical School.Irregular periods: Why is my period late?
Nemours Foundation.Irregular periods.
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