Constipation on Progesterone HRT: What’s Causing It and What Helps

A lot of my clients notice their bowels become more sluggish after starting progesterone as part of HRT. 

Constipation is a common side effect. However, there are some very effective, evidence-based strategies that can really help.

Why progesterone can affect digestion

Progesterone relaxes smooth muscle in the body. This includes the muscles in the digestive tract that move food along. When this movement slows down:

• Food stays in the gut for longer

• More water is reabsorbed from the stool

• Stools become harder and more difficult to pass

This is why constipation is a recognised side effect of progesterone, and it is also why some women notice similar changes during the luteal phase of their cycle or in pregnancy when progesterone is higher.

For many women in midlife, this effect can feel more pronounced, especially if digestion was already on the slower side.

Nutrition and Lifestyle Tips

Focus on Fibre

Most people are not getting enough fibre. In the UK, average intake tends to sit well below the recommended 30g per day. At the same time, there has been a big shift towards prioritising protein, particularly for weight loss and body composition around perimenopause. While protein is important, this often comes at the expense of fibre, especially when carbohydrates are reduced too much. Some fibre- rich foods have particularly strong evidence for improving bowel movements. These include:

Kiwifruit

Eating 1 to 2 kiwis per day has been shown to improve stool frequency and ease of passing stools.

Ground flaxseed (linseed)

1 tablespoon daily can help soften stools and support regularity. It needs to be ground to be effective and should be taken with fluid. Flaxseed also contains phytoestrogens, which may reduce perimenopausal symptoms.

Chia seeds

When soaked, chia forms a gel which can help stool consistency. Add to yoghurt or make a simple chia pudding.

Hydrate Well

Increasing fibre without enough fluid can make constipation worse.

As a guide:

• Aim for regular fluid intake across the day

• A glass of water on waking can help stimulate a bowel movement

• Warm drinks can be particularly helpful in the morning

Having water before meals can also be useful for weight-loss by reducing appetite and increasing metabolism.

Move after Eating

Regular movement after meals helps stimulate gut motility. It also has benefits for blood glucose control. Moving after meals helps the body use glucose more effectively, improving insulin sensitivity and reducing post-meal spikes. Over time, this can support energy levels, appetite regulation and weight management.

Keep Meals Regular

Skipping meals or long gaps without eating can slow the digestive system further.  Try to have consistent mealtimes.

Consider Magnesium

Magnesium can support bowel regularity, particularly forms such as magnesium citrate.

It is always worth checking suitability with a GP or pharmacist, especially if taking other medications.

Get in Touch

Constipation on progesterone HRT is common, but it is usually manageable with the right approach. If you are struggling with digestion or navigating HRT changes, I offer personalised nutrition support tailored to midlife and menopause. You can find more information about working with me here.