Can Constantly Sucking In Your Stomach Affect Pelvic Floor Relaxation?

A lot of people hold their stomach in all day — for photos, at the desk, out of habit — and some of them develop a nagging question: is constantly sucking in your stomach affecting the way your pelvic floor relaxes?

It's a fair question. The abdominal and pelvic floor muscles are neighbors that interact, so it is reasonable to wonder. But this is a topic where popular claims run well ahead of the evidence, and this article tries to stay strictly with what research has actually shown — and where it stops.

This article is educational and is not medical advice. If you have symptoms, consult a healthcare professional.

Three related behaviors that are often confused

Before looking at the evidence, it helps to separate three behaviors that are frequently treated as the same thing but are not:

• Abdominal bracing: co-contraction of the abdominal wall muscles to stiffen the trunk and increase stability. Bracing does not necessarily pull the abdomen inward — the abdomen may stay in place or even press outward slightly while the wall stiffens. It is commonly used during lifting and loaded movement.
• Abdominal hollowing (drawing-in): actively pulling the lower abdomen inward, typically described as drawing the belly button toward the spine.
• Stomach gripping: a chronic, habitual pattern of keeping the abdomen — often the upper abdomen — held in, frequently without conscious awareness, throughout daily life. In patient education this is sometimes called "hourglass syndrome" [5].

This article is mainly concerned with chronic hollowing and stomach gripping — the pattern of holding the abdomen in for hours a day — while abdominal bracing is discussed as a related but distinct behavior, because much of the research and much of the public discussion mix them together. People sometimes describe the result of chronic holding as feeling "tight abs," but a tight-feeling abdominal wall is a description of sensation, not a clinical finding by itself.

What the research actually shows about abdominal–pelvic floor interaction

There is a physiological basis for the question. The abdominal and pelvic floor muscles participate in coordinated pressure and movement tasks, and studies have examined how their activation overlaps.

An early electromyographic study by Sapsford et al. examined interactions between the pelvic floor and the abdominal muscles [1]. When seven women voluntarily contracted their pelvic floor muscles, increased abdominal muscle activity was observed in at least one tested spinal posture. The reverse direction — abdominal contraction eliciting pelvic floor activation — was tested in only two subjects [1]. In this study, the better-supported direction was "pelvic floor contraction recruits abdominal activity," while evidence for the reverse direction was preliminary.

A systematic review and meta-analysis by Vesentini et al. examined co-contraction of the pelvic floor and abdominal muscles in women with and without pelvic floor dysfunction, including 20 studies [2]. The review concluded that while co-activation occurs, the quality of the evidence was very low and findings should be interpreted cautiously [2]. In plain terms: the interaction is real enough to be measurable, but it has not been established as a consistent, predictable rule that applies the same way across people, tasks, and directions of activation.

Neither of these bodies of evidence tested the question this article asks. They measured muscle activation during brief voluntary tasks in small samples — not the effects of a chronic, all-day habit of sucking in the stomach.

The breathing link — and its limits

There is a second, often-cited pathway: breathing. A dynamic MRI study by Talasz et al. observed eight healthy nulliparous women and found that the diaphragm and the pelvic floor move in a coordinated, phase-locked pattern during breathing and coughing — the pelvic floor moves caudally (toward the feet) during inspiration and cranially during expiration [3].

Note carefully what this study showed: coordinated movement between the diaphragm and pelvic floor during breathing. It did not measure whether the pelvic floor muscles were "relaxing" or "lengthening," and with eight participants it cannot support broad conclusions about what happens when breathing mechanics are chronically altered.

From here, popular accounts often take the next step: constant stomach holding restricts abdominal movement during breathing, which disrupts this coordination, which prevents the pelvic floor from relaxing properly. That chain is a plausible hypothesis, but it is not what the studies demonstrated. Sustained abdominal holding may reduce abdominal wall excursion in some people. However, the cited studies did not directly test chronic bracing or stomach gripping [1][3]. The complete causal chain — chronic holding → breathing dysfunction → pelvic floor overactivity — has not been established by controlled research.

The honest summary

Putting the evidence together:

Abdominal and pelvic floor muscles can co-activate during certain tasks, and small studies in women show coordinated diaphragm and pelvic floor movement during breathing [1][2][3]. These findings do not establish that chronic stomach sucking, abdominal hollowing, or abdominal bracing causes pelvic floor overactivity.

What is reasonable to say:

• The anatomical and functional relationships make an influence plausible.
• Patient education materials have raised the possibility that chronic stomach gripping contributes to breathing and pelvic floor symptoms [5]. This is a possibility raised in educational content, not a demonstrated clinical finding.

What is not established:

• That chronic stomach sucking causes pelvic floor overactivity or dysfunction.
• That releasing the habit reliably resolves pelvic floor symptoms.
• That any specific breathing technique treats pelvic floor conditions. A systematic review found little evidence supporting breathing exercises as a treatment for urinary incontinence or pelvic organ prolapse [4].

Signs that warrant professional assessment

If you have symptoms, the cause may or may not be related to a holding habit — an assessment can tell. General signs that a pelvic floor evaluation may be useful (they have many possible causes and are not diagnostic):

• Persistent pelvic pressure, tightness, or aching.
• Changes in bladder or bowel control, urgency, or pain.
• Pain with intercourse.

The right step is an evaluation by a pelvic floor physical therapist or another qualified clinician — not a self-directed plan based on an article.

What can reasonably be done

These are general directions, not treatment recommendations:

• Build awareness of the habit. Notice when and where you hold your abdomen. Interrupting constant unconscious holding is a reasonable, low-risk step, whether or not it turns out to be the cause of any symptoms.
• Consider breathing awareness with realistic expectations. Some people find diaphragmatic breathing useful for noticing abdominal tension. Be aware, though, that evidence for breathing exercises as a treatment for pelvic floor conditions is limited [4] — treat them as an awareness tool, not a proven therapy.
• Do not assume the pelvic floor is weak. Pelvic floor symptoms can involve impaired relaxation as well as weakness, so exercise selection should follow an individual assessment [6]. Conditions involving excessive pelvic floor tone exist and are treated differently from weakness — this is a reason for professional assessment before choosing exercises [6].
• Get assessed if symptoms exist. A pelvic floor physical therapist can determine what is actually going on — tone, coordination, strength, or something else.

FAQ

Does sucking in your stomach cause pelvic floor dysfunction?

Not established. The abdominal and pelvic floor muscles interact and co-activation has been observed in small studies [1][2], but no controlled study demonstrates that chronic stomach sucking causes pelvic floor dysfunction.

Is abdominal bracing the same as sucking in your stomach?

No. Bracing is co-contraction of the abdominal wall for trunk stability, without necessarily pulling the abdomen inward. Hollowing/drawing-in pulls the abdomen in deliberately; stomach gripping is the chronic, habitual version of that holding.

Are breathing exercises a proven treatment for pelvic floor problems?

No. A systematic review found little evidence supporting breathing exercises as a treatment for urinary incontinence or pelvic organ prolapse [4]. They may be useful for awareness, but they should not be assumed to treat dysfunction.

How do I know if my habit of holding my stomach is affecting my pelvic floor?

You cannot reliably self-diagnose this. Persistent pelvic tightness, bladder or bowel changes, or pain warrant assessment by a pelvic floor physical therapist.

About this guide

Author: AUTHOR_NAME_PLACEHOLDER

Medically reviewed by: MEDICAL_REVIEWER_PLACEHOLDER

Review date: REVIEW_DATE_PLACEHOLDER

Methodology: this guide summarizes selected primary studies, systematic reviews, and patient education articles. It is not a systematic review. Each claim in the text is limited to what the cited study directly supports; mechanistic reasoning is labeled as such. Patient education materials [5][6] are explicitly labeled and are not counted as clinical evidence. This article is educational, not medical advice, and does not replace individual assessment by a healthcare professional.

References

1. Sapsford RR, Hodges PW, Richardson CA, Cooper DH, Markwell SJ, Jull GA. Co-activation of the abdominal and pelvic floor muscles during voluntary exercises. Neurourology and Urodynamics, 2001;20(1):31–42. PubMed
2. Vesentini G, El Dib R, Righesso LAR, et al. Pelvic floor and abdominal muscle cocontraction in women with and without pelvic floor dysfunction: a systematic review and meta-analysis. Clinics (Sao Paulo), 2019;74:e1319. doi:10.6061/clinics/2019/e1319. PubMed
3. Talasz H, Kremser C, Kofler M, Kalchschmid E, Lechleitner M, Rudisch A. Phase-locked parallel movement of diaphragm and pelvic floor during breathing and coughing—a dynamic MRI investigation in healthy females. International Urogynecology Journal, 2011;22(1):61–68. PubMed
4. Can you breathe yourself to a better pelvic floor? A systematic review. Neurourology and Urodynamics, 2023. doi:10.1002/nau.25218. PubMed | Wiley
5. Cleveland Clinic. Hourglass Syndrome: Why You Should Stop Sucking In Your Stomach. (Patient education article, not peer-reviewed research.) Cleveland Clinic
6. Cleveland Clinic. Hypertonic Pelvic Floor: Symptoms, Causes & Treatment. (Patient education article, not peer-reviewed research.) Cleveland Clinic