
Weak pelvic floor muscles can cause a host of issues, including incontinence, constipation, and pain during sex. The pelvic floor muscles support the bladder, bowel, and uterus, and when they are weak, they can struggle to control the release of urine, faeces, and wind. There are many causes of weak pelvic floor muscles, including pregnancy, childbirth, obesity, and the natural ageing process. In addition, certain conditions, such as diabetes, may contribute to weakening pelvic floor muscles. Pelvic floor exercises can help strengthen the muscles and improve muscle tone.
| Characteristics | Values |
|---|---|
| Pregnancy | Hormonal changes and physical stress |
| Childbirth | Vaginal delivery and physical trauma |
| Ageing | Loss of muscle strength |
| Obesity | Increased stress on the pelvic floor |
| Surgery | Hysterectomy, prostatectomy, and pelvic radiation |
| Trauma | Accidents, sexual trauma, physical abuse, and mental health issues |
| Genetics | Weaker tissues |
| Race | Higher risk for White and Latina women |
| High-impact exercise | --- |
| Poor posture | --- |
| Overuse | Chronic coughing, constipation, and frequent urination |
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What You'll Learn

Pregnancy and childbirth
During pregnancy, the pelvic floor muscles stretch to accommodate the growing baby, and this, along with hormonal changes, can weaken the muscles. The placenta secretes the hormone relaxin, which increases the flexibility of ligaments in the pelvis and softens the cervix. This softening of the muscles and ligaments can make it harder to support the increased weight of pregnancy, and can even cause the pelvis to be less stable. The extra weight of pregnancy also places increased strain on the pelvic floor, resulting in an increased risk of urinary incontinence. Constipation is common during pregnancy, especially in the third trimester, and the related straining and stress can further weaken the pelvic floor muscles.
Childbirth, particularly vaginal delivery, is considered the most significant risk factor for pelvic floor disorders. During childbirth, the pelvic floor muscles undergo tremendous stress, especially during the second stage of labor when there is active pushing. This risk is increased with operative deliveries using vacuum or forceps, and with larger babies. The stretching and strain of childbirth can cause the weakened muscles to not return to their optimal location, and this can make it harder to control the bladder.
However, it is important to note that pelvic floor disorders are not a foregone conclusion during pregnancy and childbirth. There are steps that can be taken to reduce the risk, such as attending birthing classes, doing stretching and breathing exercises, pregnancy yoga, perineal massage, and Kegel exercises. Pelvic floor exercises can also help with recovery after childbirth, and most women can start gentle exercises within 24 hours after birth.
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Obesity and constipation
Constipation, particularly chronic constipation, can also contribute to weak pelvic floor muscles. Chronic constipation is estimated to affect 10-20% of people worldwide and is about twice as common in women as in men. It is also more prevalent after the age of 65. One form of constipation is anismus, or dyssynergic defecation, which is a type of pelvic floor dysfunction that makes it difficult to pass stool. Anismus can manifest as the failure of the muscles that hold in stool to relax, or even tightening of the muscles when trying to pass stool (paradoxical contraction). About half of individuals with anismus have an impaired ability to sense the urge to defecate. To diagnose anismus, healthcare providers may perform rectal exams, sigmoidoscopy, and anorectal manometry testing to measure muscle contractions and relaxations.
Pelvic floor weakness can lead to a range of issues, including bladder control problems, anal incontinence, and sexual difficulties. For example, weak pelvic floor muscles can cause reduced vaginal sensation and painful sex. In some cases, the internal organs supported by the pelvic floor, such as the bladder and uterus, can prolapse, or slide down into the vagina. Pelvic floor exercises are designed to improve muscle tone and prevent the need for corrective surgery. These exercises can be done in various positions, such as lying down, sitting, or standing, and aim for 5-6 sessions per day when first learning them.
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Ageing and menopause
Pelvic floor muscles tend to get weaker as people age. This is due to the degenerative process that affects the pelvic floor muscles more than other muscle groups. The muscles and fascia become more fibrotic, and fat cells fill in the spaces between muscle cells, causing the muscles to become weaker and less agile.
The pelvic floor muscles contain receptors for estrogen, which explains the changes in the pelvic floor during menopause. The lack of estrogen during menopause thins the support structures and tissues that hold pelvic organs in place, causing them to fall. The thinning and lack of vaginal moisture associated with menopause can also cause problems with sexual function. The vaginal tissue becomes frail and less supple, and stretching from intercourse can be irritating or painful.
Genitourinary syndrome of menopause (GSM) is a common dysfunction of the pelvic floor during menopause. GSM is a collection of symptoms affecting the genital and urinary systems, including recurrent urinary tract infections, urinary pain, urinary incontinence, vaginal dryness, and painful intercourse. Urinary incontinence is a common symptom of pelvic floor dysfunction, and menopause increases the risk of leaking urine.
Pelvic organ prolapse is another common condition associated with menopause. During menopause, the pelvic organs drop lower into the pelvic cavity or through the vaginal opening. The lack of estrogen causes thinning of the vagina and reduces the strength of the connective tissue supporting it. This can lead to a prolapse, where the tissues supporting the pelvic organs are stretched and damaged.
Pelvic floor exercises can help strengthen the muscles at any age. These exercises can be done lying down, sitting, or standing, and aim for five to six sessions per day when learning the exercises. Postmenopausal people with tight pelvic floors may also develop chronic pelvic pain (CPP) after pelvic surgery.
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Trauma and surgery
Childbirth is a common cause of pelvic floor weakness, and the risk of developing pelvic floor disorders is linked to the mode of delivery. Vaginal deliveries are associated with a higher risk of pelvic floor disorders than surgical deliveries. The muscles supporting the pelvic organs may become overstretched during childbirth, leading to a condition called pelvic organ prolapse (POP). POP occurs when the pelvic floor muscles loosen, causing the pelvic organs, such as the uterus, bladder, and rectum, to bulge into or even protrude from the vagina.
Pelvic floor muscles can also weaken over time due to the natural ageing process. As individuals age, their muscles, including the pelvic floor muscles, tend to lose strength. This weakening can lead to conditions like incontinence or pelvic organ prolapse, which may require reconstructive surgery to secure the pelvic organs in place.
Additionally, certain groups of women, such as white or Latina women, may be at higher risk for some forms of pelvic floor disorders. Genetic factors also play a role, as some women are born with conditions that affect the strength of their connective tissues, making them more susceptible to pelvic organ prolapse.
It is important to note that pelvic floor dysfunction can exist alongside or be mistaken for other conditions, such as interstitial cystitis and irritable bowel syndrome (IBS). Seeking advice from a specialised physiotherapist or physician is recommended to receive a proper assessment and treatment plan.
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Genetics and race
Genes influence the strength of a woman's bones, muscles, and connective tissues. Some women are born with conditions that affect the strength of their connective tissues, making them more likely to experience pelvic organ prolapse. Connective tissue disorders are also a known factor in pelvic floor dysfunction.
The link between genetics and weak pelvic floor muscles is not entirely clear, but research suggests that certain genetic factors may increase the risk of developing pelvic floor disorders. These disorders can lead to problems with bladder and bowel control, sexual function, and pain.
Race also appears to play a role in the development of pelvic floor disorders. Studies have shown that certain groups of women, such as white or Latina women, are at higher risk for specific forms of pelvic floor disorders. However, the underlying reasons for these racial disparities are not yet fully understood and require further investigation.
It is important to note that the development of pelvic floor problems is influenced by a combination of genetic, racial, and other factors. These factors include pregnancy, childbirth, obesity, constipation, ageing, and previous surgeries. The interaction between these factors is complex, and further research is needed to fully understand their individual and collective impact on pelvic floor health.
While genetics and race may contribute to weak pelvic floor muscles, they are not the only determinants. Environmental and lifestyle factors also play a significant role. Access to healthcare, cultural practices, and socioeconomic status can influence the prevalence and severity of pelvic floor disorders across different racial and ethnic groups.
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