--- title: Constipation a week before your period: is it normal? description: Constipation a week before your period is common and tied to rising progesterone in the luteal phase. Here's why, and how to tell it from early pregnancy. url: https://niyora.com/symptoms/constipation-a-week-before-period/ --- - [Niyora](https://niyora.com/) - [Symptoms](https://niyora.com/symptoms/) - Constipation a week before your period: is it normal? Premenstrual symptoms # Constipation a week before your period: is it normal? Constipation a week before your period is common. Progesterone rises in the luteal phase and slows digestion, so stool moves through more slowly until your period starts and the hormone drops. If it doesn't ease within a few days of bleeding, or comes with severe pain or a late period, it's worth a closer look. Updated 14 October 2026 Niyora editorial Limited evidence When it tends to show up Period Ovulation Before your period Builds after ovulation, peaks in the days before your period, and eases once bleeding starts. ## At a glance - Rising progesterone in the luteal phase slows digestion, which is why constipation often shows up about a week before your period. - This pattern usually eases within a few days of your period starting. - Progesterone also rises in early pregnancy, so constipation plus a late period is worth a home pregnancy test. - Water, fiber, movement, and a steady bathroom routine can ease it within a day or two. - Constipation that lasts beyond your period, or comes with severe pain or blood in your stool, is worth getting checked. ## Strength of evidence Limited evidence - None - Limited - Mixed - Moderate - Strong Most evidence on premenstrual constipation comes from broader PMS symptom trials, not studies on bowel changes alone. A 2018 exercise trial and a 2026 web-based relaxation trial both showed improvement in physical PMS symptoms, including constipation, but neither is large or constipation-specific. Side by side PMS and Early pregnancy Timing PMS Starts about a week before your period, same as most months Early pregnancy Starts around when your period is due, and it doesn't come Also compared in the table below - Period - Other symptoms - What to do | Compared on | PMS | Early pregnancy | | --- | --- | --- | | Timing | Starts about a week before your period, same as most months | Starts around when your period is due, and it doesn't come | | Period | Arrives on schedule or close to it | Late or missing | | Other symptoms | Bloating, breast tenderness, mood changes that ease once bleeding starts | Nausea, breast tenderness that doesn't ease, ongoing fatigue | | What to do | Track the pattern for a cycle or two | Take a home pregnancy test once your period is late | ## Why do you get constipated a week before your period? Progesterone rises after ovulation and stays high through the luteal phase, the one to two weeks before your period. Here's what that does to digestion: - **Progesterone relaxes smooth muscle**, including the muscle that pushes food through your intestines, so digestion slows down. - Slower transit means stool sits in your colon longer, which pulls more water out of it and makes it harder to pass. - Progesterone also causes some fluid retention, which is why constipation often shows up alongside bloating rather than alone. - Once progesterone drops and your period starts, that muscle goes back to its usual pace, and most women find things move again within a few days. That's the same mechanism behind pregnancy-related constipation, since progesterone stays high there too. For more on this mechanism, read [constipation in the luteal phase](https://niyora.com/cycle/luteal-phase-constipation/). ## Is constipation a week before your period normal? Yes. Constipation is one of the common physical symptoms of PMS, alongside bloating, breast tenderness, headaches, and fatigue. Physical symptoms like this often get less attention than mood swings, but they're just as common and just as real. A study that tracked women's daily moods and physical symptoms across the menstrual cycle found a clear premenstrual pattern in physical symptoms, not only mood (Health Psychology, 1991). A 2018 trial of women with PMS found that gut symptoms, including constipation, nausea, and diarrhea, eased significantly (p = 0.01) after eight weeks of regular aerobic exercise, compared with women who didn't exercise (BMC Women's Health, 2018). If your constipation shows up at roughly the same point each cycle and clears within a few days of your period starting, that pattern fits PMS. Keeping a quick note of when it starts each month makes the pattern obvious within two or three cycles. Niyora is a PMS and PMDD support app that estimates your PMS window, so you can see whether this timing is part of your usual pattern rather than guessing each month. See [symptoms a week before your period](https://niyora.com/cycle/week-before-period/) for what else is typical then, or read more on [constipation before your period](https://niyora.com/symptoms/constipation-before-period/). Right now What to do about constipation right now - 1 Drink a full glass of water now, and keep sipping through the next hour. - 2 Eat something with fiber if you have it on hand: fruit, oats, or nuts. - 3 Take a 10-minute walk, even just around the block or your building. - 4 When you sit down, try propping your feet on a low stool so your knees sit above your hips. - 5 Note today's date somewhere you'll see it again, so you can check if this happens every month. Niyora walks you through this when it happens: - Calm down - - See it another way - - Choose what to say ## Is it PMS or early pregnancy? Constipation alone doesn't tell you which one this is. Progesterone rises in both PMS and early pregnancy, which is why the symptom looks the same at first. Neither pattern is something to guess at for long, since the test and the timeline are both fast to check. What differs is the pattern around it. | Sign | More like PMS | More like early pregnancy | | --- | --- | --- | | Timing | Starts about a week before your period, same as most months | Starts around when your period is due, and it doesn't come | | Period | Arrives on schedule or close to it | Late or missing | | Other symptoms | Bloating, breast tenderness, mood changes that ease once bleeding starts | Nausea, breast tenderness that doesn't ease, ongoing fatigue | | What to do | Track the pattern for a cycle or two | Take a home pregnancy test once your period is late | If your period is late and you're still constipated, a home pregnancy test is the fastest way to know. For a full breakdown, read [constipation: PMS or pregnancy?](https://niyora.com/conditions/pms-or-pregnant-constipation/) or the wider guide to [PMS or pregnant?](https://niyora.com/conditions/pms-or-pregnant/). ## What helps right now? A few things can ease premenstrual constipation within a day or two: - Drink more water than usual. Progesterone pulls water out of your gut, so you need to put more back in. - Add fiber at your next meal: fruit, oats, beans, or vegetables. - Move your body. A 20-minute walk counts; a 2018 trial found regular aerobic exercise eased constipation and other physical PMS symptoms over eight weeks. - Don't skip the urge when it comes. Waiting makes stool harder to pass. - Try a warm drink in the morning, which can nudge your gut into action. A 2026 trial of a web-based relaxation practice found it eased physical PMS symptoms overall over four weeks (Journal of Affective Disorders, 2026). If stress is part of what's holding things up, ten minutes of slow breathing before bed might help alongside the basics above. None of this requires special equipment, just a glass of water, a short walk, and food you probably already have. ## When should you see a doctor? Most premenstrual constipation clears on its own once your period starts. Watch for these signs instead: - It lasts beyond your period, not just the week before it. - It comes with severe pain, not just discomfort. - You notice blood in your stool or unexplained weight loss. - It happens most months and is affecting how you function. If this is a monthly pattern severe enough to track, bring two months of daily notes on when it starts and how long it lasts. That makes it much easier for a doctor to tell PMS from something else. Try [the PMS calculator](https://niyora.com/tools/pms-calculator/) to estimate when your symptoms usually begin, so you have dates ready for that conversation. When to see a doctor If this takes a week of every month, or comes with severe pain, blood in your stool, or unexplained weight loss, see a GP and bring two months of daily notes on timing. ## What does the research say? Constipation doesn't have its own large dedicated trial. Most of what we know comes from research on PMS symptoms as a group. | Approach | What it does | Evidence so far | | --- | --- | --- | | Aerobic exercise | Three 20-minute sessions a week eased constipation and other physical PMS symptoms | One randomized trial, n = 65 (BMC Women's Health, 2018) | | Web-based relaxation practice | Eased physical and emotional PMS symptoms over four weeks | One small randomized trial, n = 22 to 68 (Journal of Affective Disorders, 2026) | | Daily symptom tracking | Confirms whether a symptom follows a premenstrual pattern rather than showing up randomly | Used across decades of PMS research, including a 1991 cycle-tracking study (Health Psychology) | None of these are cures, and none replace a doctor's assessment if your pattern is severe or unclear. Even without a dedicated constipation trial, the overlap between these studies and typical PMS symptoms makes the exercise and relaxation findings reasonably relevant here. If exercise or relaxation already have a place in your week, leaning on them a little harder before your period can double as symptom relief. ## Questions people ask How long does constipation before a period usually last? + Constipation before a period usually starts about a week before bleeding and eases within a few days of your period starting, once progesterone drops. If it continues after your period starts or lasts more than two weeks, it's worth tracking closely. Can constipation be an early sign of pregnancy? + Constipation can be an early sign of pregnancy, since progesterone rises and stays high in early pregnancy the same way it does before a period. The clearest sign is a missed or late period alongside the constipation; a home pregnancy test can confirm it. Is it normal to be constipated and bloated before your period? + Being constipated and bloated before your period is common and usually linked, since slower digestion lets gas and stool build up. Both tend to ease within a few days of your period starting. If bloating is severe or painful, that's worth getting checked. Does exercise help period-related constipation? + Exercise can help period-related constipation. A 2018 trial found women who did eight weeks of aerobic exercise had less constipation and other physical PMS symptoms (p = 0.01) than those who didn't. Drinking enough water and eating fiber can help too. When is premenstrual constipation not normal? + Premenstrual constipation isn't typical if it lasts beyond your period, comes with severe pain, blood in your stool, or unexplained weight loss. That's worth getting checked, with notes on when it started and how long it lasted. ## Sources - 1. [The effect of 8 weeks aerobic exercise on severity of physical symptoms of premenstrual syndrome: a clinical trial study](https://doi.org/10.1186/s12905-018-0565-5), BMC women's health, 2018 - 2. [Effect of web-based progressive muscle relaxation and lifestyle interventions on psychological well-being, occupational performance, and quality of life in women with premenstrual syndrome: A randomized controlled trial with 4-week follow-up](https://doi.org/10.1016/j.jad.2026.121278), Journal of affective disorders, 2026 - 3. [Daily moods and symptoms: effects of awareness of study focus, gender, menstrual-cycle phase, and day of the week](https://doi.org/10.1037//0278-6133.10.3.180), Health psychology : official journal of the Division of Health Psychology, American Psychological Association, 1991 Ask AI about this page Copy prompt ChatGPT ↗ Claude ↗ Perplexity ↗ Google AI Mode ↗ Grok ↗ On this page - [Why do you get constipated a week before your period?](#why-do-you-get-constipated-a-week-before-your-period) - [Is constipation a week before your period normal?](#is-constipation-a-week-before-your-period-normal) - [Is it PMS or early pregnancy?](#is-it-pms-or-early-pregnancy) - [What helps right now?](#what-helps-right-now) - [When should you see a doctor?](#when-should-you-see-a-doctor) - [What does the research say?](#what-does-the-research-say) - [Questions](#faq) Niyora PMS & PMDD support For the hard moment before your period. Private, no account. [Get it on iPhone](https://apps.apple.com/app/niyora-pms-emotions/id6764561688) ## Keep reading Cycle guide Symptoms a week before your period: what's normal Condition What is PMS? Premenstrual syndrome, explained Guide All symptoms Symptom Constipated before your period: why it happens and what helps Cycle guide Constipation in the luteal phase: why it happens Condition Constipation before your period: PMS or pregnancy? Condition PMS or pregnant? How to tell PMS vs pregnancy symptoms apart Guide PMS calculator Guide Take the two-minute check