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    Constipation Before Your Period: Causes and Treatments

    Updated 22 December 2020 |
    Published 01 October 2018
    Fact Checked
    Reviewed by Irina Ilyich, Flo lead medical advisor, Lithuania
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    Some people experience symptoms every month before their period: stomach cramps, muscle pain, changes in mood, etc. Constipation before your period is another common symptom of premenstrual syndrome (PMS). Read on for more information about the causes of premenstrual constipation and popular remedies.

    Reasons for premenstrual constipation

    Progesterone is usually to blame for constipation before your period. Levels of this particular hormone spike before the onset of monthly menstruation, and it slows down the digestive system. 

    Immediately after ovulation, progesterone (which is a natural muscle relaxant) drastically increases. This essentially leads to constipation by delaying the movement of food through the bowels. 

    Thankfully, PMS constipation typically gets better once menstruation actually begins. This is a direct result of a rapid drop in progesterone levels during your period. Some people experience temporary diarrhea when this happens, since the hormone previously responsible for slowing down the digestive system is suddenly absent. 

    Another contributing factor for PMS diarrhea is a sudden boost of prostaglandins — a hormone-like substance produced by the endometrial cells. If present in extremely large amounts, prostaglandins may find their way into the muscles lining the bowels. While there, they encourage the intestines to contract and move the bowels very quickly.

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    How to treat constipation before your period

    Whether or not it happens during your period, increasing fiber intake is usually a good treatment for constipation. It may be helpful to eat meals that include whole wheat breads, high-fiber cereals, and a wide assortment of fresh fruits and vegetables. Avoid fatty, sugary foods, and drink plenty of fluids to maintain regularity.

    Exercise and other forms of physical activity might also be helpful in preventing constipation. Movement improves blood and oxygen circulation, which helps keep the bowels active. Regular exercise not only alleviates constipation before your period, it could tackle other premenstrual symptoms as well.

    Remember that you can log changes in bowel movements, such as constipation, diarrhea, and bloating, in the Flo app. This makes it easy to spot any correlations between these conditions and whatever stage of the menstrual cycle you’re currently in.

    If the tips above fail to relieve PMS constipation and you’re still having irregular bowel movements, seek medical attention. A health care provider will be able to investigate potential digestive disorders.


    Women's Health Team. “Why You Get Diarrhea, Constipation (or Both) During Your Period.” Health Essentials from Cleveland Clinic, Health Essentials from Cleveland Clinic, 6 Mar. 2018, “Constipation.” NHS Choices, NHS, 13 Aug. 2019, Bernstein, Matthew T, et al. “Gastrointestinal Symptoms before and during Menses in Healthy Women.” BMC Women's Health, BioMed Central, 22 Jan. 2014, Ruan, Ye Chun, et al. “Regulation of Smooth Muscle Contraction by the Epithelium: Role of Prostaglandins.” PHYSIOLOGY.ORG, Physiology, 1 June 2011,

    History of updates

    Current version (22 December 2020)

    Reviewed by Irina Ilyich, Flo lead medical advisor, Lithuania

    Published (01 October 2018)

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