Reasons for Having a Period Every Two Weeks

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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.

Add a Comment94 Comments

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
Maryann Gromisch RN 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
Maryann Gromisch RN Guide (reply to Anonymous)

Hello Anonymous,

The only way to fix the problem is to identify what is causing it.
I understand you had an ultrasound and have tried oral contraceptives, but has your gynecologist done any blood tests to check your hormone levels?

The menstrual cycle is regulated by a precise balance of hormones. Any upset in this balance will cause irregularities. In addition to checking estrogen, progesterone, follicle-stimulating hormone and luteinizing hormones, it would be wise to check your thyroid gland, pituitary gland and adrenal gland functions.
Just a thought.


November 10, 2015 - 9:22am
EmpowHER Guest

Hello, I'm fifteen years old, and I've been consistently having periods twice a month for maybe three months now. It started earlier last year as well, but my cycle went back to normal by the beginning of this year. I have already gone to see my doctor, but I tested negative for anemia. I don't understand why I'm getting such frequent periods, and it worries me because it conflicts with my swim team obligations.

November 5, 2015 - 6:57pm
Maryann Gromisch RN Guide (reply to Anonymous)

Hello Anonymous,

Has the doctor checked hormone levels?

I am glad that you have not developed iron deficiency anemia, but having two periods a month is no fun and the cause needs to be found.


November 6, 2015 - 9:57am
EmpowHER Guest

I am 14 and started my period around 1.5 years ago and recently I have had a period and then only 12 days later I have had another period. Do I need to see a doctor?

November 5, 2015 - 12:42pm
Maryann Gromisch RN Guide (reply to Anonymous)

Hello Anonymous,

Have you mentioned this to your parent? You can either wait and see if this happens again, or ask your parent to speak with a nurse at your pediatrician's office. If you were my daughter, I would mention this to the pediatrician and follow any recommendations.


November 6, 2015 - 9:54am
EmpowHER Guest

Hello, I am 11 years old and got my first period on the 25th of october. It ended on the 29th. I just got another one today and I'm a bit confused. It's only been 6 days? Anyway, I have been under stress in the past 4-5 days (project for school) so I'm thinking that that might be the reason. Advice?

November 4, 2015 - 7:13pm
Maryann Gromisch RN Guide (reply to Anonymous)

Hello Anonymous,

Generally we do not answer questions from someone so young.
Have you shared this with your mother?

In the beginning of menstruation, it is not unusual for the menstrual cycle to be irregular. As your body adjusts to the changes in hormones, your periods should become more regular.

I asked if you shared this with your parent because it might be a good idea for her to contact your pediatrician. Six days in between is a very short time and you may want to check with your doctor.


November 5, 2015 - 9:27am
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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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