Pelvic Floor Muscles: What They Do and Why They Weaken

Most people first hear about their pelvic floor muscles when something has already gone wrong with them. This guide explains what they are, the four jobs they quietly do, why they weaken and what the first steps are if yours are not working properly. It is written for UK readers after birth, around menopause, or anyone told to strengthen theirs without being told much else.

TL;DR

• The pelvic floor is a sling of muscle across the base of the pelvis, not a single muscle.
• It does four jobs: support, continence, stability and sexual function.
• It weakens through pregnancy, birth, menopause, chronic coughing, straining and long-term heavy lifting.
• Weakness and excessive tension cause overlapping symptoms and need opposite treatment.
• It works as part of a system with the diaphragm, deep abdominals and glutes.
• Training it is well evidenced, free, and takes about three months to show.

Where they are and what they look like

Picture the bottom of your pelvis as a bowl with an open base. The pelvic floor muscles stretch across that opening like a hammock, running from your pubic bone at the front to your tailbone at the back, and out to the sitting bones on each side.

They are not one muscle. There are several layers, with a deeper layer providing most of the support and a more superficial layer around the openings. Passing through them are the urethra, the vagina and the rectum, which is why the muscles have to be able to both close firmly and relax completely.

The four jobs they do

• Support. They hold your bladder, bowel and uterus in position against gravity and against the downward pressure of anything you do standing up.
• Continence. They keep the urethra and the anus closed, and they have to react fast enough to stay closed when you cough, sneeze or laugh.
• Stability. They work with the diaphragm above and the deep abdominals around to manage the pressure inside your abdomen. That system is what stiffens your trunk when you lift something.
• Sexual function. They contribute to sensation and to orgasm, and tension in them is a common and under-discussed cause of pain.

The stability job is the one most people have never heard of, and it is why pelvic floor problems so often turn up alongside back pain.

Why pelvic floor muscles weaken

• Pregnancy. Nine months of increasing downward load, plus hormonal softening of connective tissue. This happens regardless of how the baby is born.
• Birth. Particularly a long second stage, an instrumental delivery, or significant tearing.
• Menopause. Falling oestrogen thins tissues and reduces muscle bulk.
• Chronic coughing. Repeated pressure spikes, which is why long-term smokers and people with asthma are more affected.
• Constipation and straining. One of the most modifiable causes on this list.
• Heavy lifting with poor technique. Especially holding your breath and bearing down.
• Age and inactivity. Like any other muscle.

Weak is not the only problem

This is the part most articles skip. A pelvic floor can also be too tight, and a tight one produces symptoms that look almost identical to a weak one: leaking, urgency, a feeling of not emptying properly, and discomfort.

Squeezing exercises are the standard advice, and if the underlying problem is tension, they make it worse. If your symptoms increase when you do pelvic floor exercises, or you have pain, that is a reason to be assessed rather than to try harder. Our guide to pelvic floor tension covers what to do instead.

How to start strengthening them

Assuming weakness rather than tension, the sequence is straightforward.

• Find the muscle. Lie down, relax your buttocks and stomach, and squeeze as though stopping wind and stopping urine at once. The feeling is a lift inwards and upwards. Our kegel exercise guide covers this in detail.
• Train both speeds. Slow holds for endurance, quick squeezes for reaction.
• Release fully every time. A muscle that never lets go gets tight.
• Progress the position. Lying, then sitting, then standing.
• Train the system around it. Glutes, hips and deep abdominals share the load. Our twelve-week pelvic floor routine builds both together.

For the surrounding work, a light loop and a small ball do almost everything. Our Postnatal Recovery Kit includes both plus a latex-free band, cotton strap and printed pelvic floor guide for £14.99. It is for the supporting muscles, not the pelvic floor itself, which still needs the exercises.

Shop the Postnatal Recovery Kit

When to get it assessed

See a GP or a women's health physiotherapist if you leak, feel heaviness or dragging, have pain with sex or with exercise, or cannot feel a contraction at all. The NHS page on urinary incontinence covers when to seek help, and the Pelvic, Obstetric and Gynaecological Physiotherapy network lists specialists. An internal assessment tells you in one appointment what months of guessing will not.

FAQs

Where exactly are the pelvic floor muscles?

They span the base of your pelvis like a hammock, running from the pubic bone at the front to the tailbone at the back and across to the sitting bones either side. They sit in layers, with a deeper supporting layer and a more superficial layer around the openings for the urethra, vagina and rectum.

How do I know if my pelvic floor muscles are weak?

Common signs are leaking when you cough, laugh, sneeze or exercise, needing the toilet urgently, a feeling of heaviness or dragging in the vagina, or reduced sensation during sex. Not being able to feel a contraction at all is also a sign. All of these are worth an assessment because tension causes similar symptoms.

Do pelvic floor muscles get weaker with age?

Yes, like any muscle, and menopause accelerates it because falling oestrogen thins the tissues. That is not inevitable decline though. Pelvic floor muscles respond to training at any age, which is why the exercises are recommended well beyond the postnatal years.

Can strong pelvic floor muscles be a problem?

Strong is fine. Permanently tight is not. A pelvic floor that cannot fully relax can cause pain, difficulty emptying the bladder or bowel, and even leaking, which is why full release between repetitions is part of the technique rather than an afterthought.

Do the pelvic floor muscles affect back pain?

They can. The pelvic floor works with the diaphragm and deep abdominals to manage pressure and stiffen the trunk, so when it is not contributing properly other structures take more load. Pelvic floor and back symptoms often turn up together, which is one reason assessments look at both.

How long does it take to strengthen pelvic floor muscles?

Most people notice change between four and twelve weeks, with clinical programmes running at least three months before judging results. Very little happens in the first few weeks, so persistence past that point is the main predictor of success.

Conclusion

The pelvic floor muscles do four jobs, and most people only find out about them when one of the four stops working. They respond well to training at any age, but the training has to be the right kind, which means establishing whether the problem is weakness or tension first.

If it is weakness, our twelve-week routine is the place to start, and the Postnatal Recovery Kit covers the supporting strength work at £14.99.