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Reasons for Having a Period Every Two Weeks

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Menstrual Cycle related image Andres Rodriguez/PhotoSpin

The menstrual cycle occurs in all females from the onset to puberty (average age 11 or 12 years) to the menopause in middle age (average age between 45-55). The lining of the uterus is shed via vaginal bleeding when a girl or woman has not conceived a pregnancy.

The menstrual period lasts between two days and seven days, usually occurring once every 28 days, although anything from once every 24 days to once every 35 days is considered normal.

If you are having a period more than once every 24 days, it is considered an irregular cycle.

Having a period once every two weeks, or twice a month is abnormal and you should see your doctor because you may become anemic if you are having very frequent periods. They are sometimes a sign of infection or other medical problem that would need treatment.

Reasons for a period every two weeks could be:

• Dramatic weight loss or gain -- This changes the hormones in the body and these are responsible for directing when the period will start.

• Excessive exercise -- This too disrupts hormones.

• Stress -- Exams, family argument, financial worries, divorce, even a holiday can cause a temporary change in your menstrual cycle.

• Illness and/or medications -- Some medications can affect your cycle. Talk to your doctor about altering or stopping your medication if you think this is happening.

• Uterine problems such as polyps, cysts, fibroids or tumors (either benign or cancerous).

• Sexually transmitted infections -- These can cause bleeding in between periods which can be mistaken for a period.

• Thyroid problems -- Thyroid disease could cause a thickening of the uterine lining, resulting in more bleeding than normal.

• Reactions to contraceptive methods -- Sometimes the pill, depo provera injections or the copper-only IUD can result in a change in your cycle.

~ The pill and IUD can make you bleed in between periods, known as "breakthrough bleeding" and this may be mistaken for a period.

~ The IUD can also make your periods heavier.

~ The depo-provera injection can make your cycle irregular, however, it often stops your period altogether instead of making it more frequent.

~ Sometimes changing or stopping your method of contraception can cause a sudden drop in hormones and this can result in a change to your cycle.

• Onset of menopause -- In women aged 45 and over, having periods every two weeks can be a sign that you are about to go through menopause. It can be a sign of ovulation beginning to shut down. If you are under 45, having irregular periods in addition to other symptoms commonly associated with menopause, may signal premature ovarian failure.


Sometimes treatment is not necessary, for instance, if the disruption in cycle is due to stress, weight loss or gain, or illness, it may be temporary and may correct itself in time.

However, to rule out other possibilities your doctor will perform a pelvic examination. Your doctor may also take a sample of the uterine lining as well as doing an ultrasound scan to see if there are any obstructions in the uterus, such as fibroids.

If any obstructions are found, you can be referred for surgery to have them removed. If any cancer is found, you will be referred to an oncologist who will plan your care with you.

Sexually transmitted infections can be treated with antibiotics (and the use of condoms to prevent further infections). Your partner may have to be treated as well.

If the problem is caused by a contraceptive device or medication, this can usually be changed to stop the problem.

Heavy and/or frequent periods can sometimes be controlled by certain brands of the pill. If you find they are really disrupting your life, for instance, you are bleeding through your clothes, have to miss work days and can’t plan your holidays, this may be an option depending on your medical history.

Hormone treatment could also be given in this scenario, if you have thyroid disease or if you are starting menopause.


Periods, Heavy. NHS Choices. Web. 26 May 2012. http://www.nhs.uk/conditions/periods-heavy/pages/introduction.aspx

Heavy Periods (Menorrhagia). WebMD. Retrieved May 27, 2012.

Top Ten Causes of Heavy Menstrual Bleeding. About.com Women's health. Retrieved May 27, 2012. http://womenshealth.about.com/od/abnormalbleeding/a/causemenorrhagi.htm

Irregular Periods Every Two Weeks, 34 Menopause Symptoms. Web. 26 May 2012.

Premature Ovarian Failure, National Insititute for Child Health and Human Development. Web. 26 May 2012. http://www.nichd.nih.gov/health/topics/Premature_Ovarian_Failure.cfm

Joanna is a freelance health writer for The Mother magazine and Suite 101 with a column on infertility, http://infertility.suite101.com/ She is the mother of five children and practices natural childbirth, delayed cord clamping, full term breastfeeding and organic food diet.

Reviewed May 28, 2012
by Michele Blacksberg RN
Edited by Jody Smith

Add a Comment221 Comments

EmpowHER Guest

I'm 31 years old and i recently started having abnormal periods. My cycle lasts 7 days, but it stopped after two days. A week later there was like pink spotting, and the week after I started my period again. I've made a doctors appt. just searching for feedback until then.

January 5, 2016 - 2:21pm
Guide (reply to Anonymous)

Hello Anonymous,

This could be caused by any of the reasons mentioned in this article. Your doctor will be able to give you the specific cause.


January 6, 2016 - 9:56am
EmpowHER Guest

Hi! i'm 24 years.
My period appears twice a month and it's been 3 month already.
Should i go to see OG or it's that normal?

January 2, 2016 - 10:51pm
Guide (reply to Anonymous)

Hello Anonymous,

This is not normal. You need to be seen by a gynecologist.


January 4, 2016 - 6:55am
EmpowHER Guest

I've had two periods in one month and I've had cysts on my ovarie I'm going to go get checked anything anyone wants to add?

December 29, 2015 - 11:57pm
EmpowHER Guest

hello am 19 and ever since i started seeing my peroid it been twicw a month but i notice i saww it three times for a month is that normal

December 4, 2015 - 9:36am
Guide (reply to Anonymous)

Hello Anonymous,

This is not normal and potentially dangerous. The loss of blood associated with three periods in one month puts you at risk for iron deficiency anemia.

Please call and schedule an appointment with a gynecologist as soon as possible.


December 4, 2015 - 10:17am
EmpowHER Guest

I'm 36 years old. And I had my periods twice a month. I also gained alot of weight.and along with blood there is also water coming during periods. What is the
reason behind. I'mso tensed. Kindly suggest me some test .

November 12, 2015 - 3:55am
Guide (reply to Anonymous)

Hello Anonymous,

My suggestion is for you to contact your primary care physician or gynecologist today and schedule an appointment.

How long has this been going on? How long does each period last?
How many days in between each period?

The cause of having two periods in one month and the reason for your weight gain must be identified.


November 12, 2015 - 9:48am
EmpowHER Guest

Hi I'm 18 years old and for a few years I've been getting my period twice a month . I went on the pill to solve the problem but came off because I did not like the side effects .I've had an ultrasound and nothing was wrong. How can I fix this ? One period is usually light will the other is super heavy and bleeds through my clothes

November 9, 2015 - 9:58pm
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We value and respect our HERWriters' experiences, but everyone is different. Many of our writers are speaking from personal experience, and what's worked for them may not work for you. Their articles are not a substitute for medical advice, although we hope you can gain knowledge from their insight.

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