Menstruation and digestion

The hormone behind the discomfort: prostaglandins

Before and during your period, your body releases prostaglandins — hormone-like compounds that help the uterus contract and shed its lining. Prostaglandins are essential, but they do not stay neatly in one place.

These same compounds can affect your intestines, causing them to contract more frequently and with more urgency. For many women, this explains the loose stools or mild diarrhea that show up right around menstruation.

Higher prostaglandin levels are also linked to stronger menstrual cramps. So if your periods tend to be painful, you may notice more digestive symptoms alongside them — the two often travel together.

"Your gut and your uterus share the same chemical messengers. When one speaks loudly, the other often listens."

Why bloating happens

Bloating around menstruation has a few causes, and they often overlap. Rising and falling progesterone can slow digestion, causing food to move more slowly through your gut and creating a feeling of fullness or pressure.

At the same time, many women retain slightly more water in the days before their period. This is a normal hormonal response, but it can make your abdomen feel puffy or tight — sometimes alongside tender breasts or mild swelling elsewhere.

The combination of slower digestion and fluid retention is enough to make clothes feel tighter and comfort harder to find. It is also completely normal.

Constipation: the quieter side

While some women experience looser bowels, others find the opposite: constipation in the days leading up to a period. This is often linked to progesterone, which peaks after ovulation and has a relaxing effect on smooth muscle — including the muscles that move waste through your intestines.

Slower transit time means stools become harder and less frequent. Once menstruation begins and progesterone drops, things often return to normal. But the week before can feel sluggish and uncomfortable.

Common digestive symptoms around menstruation

• Diarrhea or loose stools — often caused by prostaglandins stimulating intestinal contractions
• Bloating and water retention — linked to progesterone fluctuations and slower digestion
• Constipation — progesterone's muscle-relaxing effect can slow gut motility before a period
• Increased gas — changes in gut bacteria and digestion speed can create more fermentation
• Nausea or reduced appetite — hormone shifts affect how your brain reads hunger and fullness cues

Gentle ways to support your digestion

You cannot control your hormones, but you can create conditions that help your gut cope more smoothly.

• Stay well hydrated. Water helps with both constipation and bloating, and it supports your body as it sheds fluid.
• Eat smaller, no heavy meals. A very full stomach on top of a sensitive gut is a recipe for discomfort.
• Prioritize fibre gently. Gluten-free grains, vegetables and legumes support regularity, but introduce them gradually if your gut is already unsettled.
• Limit very salty or highly processed foods. These can worsen water retention and bloating.
• Warmth helps. A hot water bottle on your abdomen can ease both cramping and sluggish digestion.
• Move gently. Walking, stretching or light yoga encourages gut motility without adding stress to your body.

How cycle tracking brings clarity

One of the most powerful things you can do is notice when these symptoms appear in relation to your cycle. Do they start three days before your period? Are they worse on day one or day two? Do they fade by day three?

When you track your cycle — including when digestive symptoms show up — a pattern usually emerges. What once felt random begins to feel predictable. And predictable is far easier to prepare for.

The Daysy Fertility Tracker records your basal body temperature and cycle data every day, building a clear picture of where you are in your cycle. When you know your period is approaching, you can gently adjust your meals, schedule lighter activities, and keep hydration and warmth within reach.

Over time, this awareness turns reactive discomfort into quiet preparation. You are no longer caught off guard — you are simply working with your body.

"The goal is not to eliminate every symptom. It is to recognise the pattern so you can meet it with kindness instead of surprise."

When to seek extra support

Digestive changes around menstruation are common and usually benign. But if you experience severe pain, ongoing diarrhea that leads to dehydration, blood in your stool, or symptoms that seriously affect your daily life, please speak with a healthcare professional. These can sometimes signal conditions that deserve proper attention — such as endometriosis, IBS, or food intolerances that interact with your cycle.

Bringing tracked cycle data into the 1:1 Cycle Support conversation can be incredibly helpful. A record of when symptoms appear, how long they last, and what helps them improve gives Patricia a clearer starting point.

A calmer relationship with your whole cycle

Your cycle is not just about bleeding, ovulation and fertility. It is a whole-body rhythm that touches your energy, your mood, your sleep — and yes, your digestion.

When you begin to see these connections, your body starts to feel less mysterious and more like a system you can gently understand. That understanding is where real comfort begins.