Is Holding in Your Stomach Bad for You?

Habitually holding in your stomach can genuinely cause problems, though they tend to creep up slowly rather than hit you all at once. The main issues are restricted breathing, chronic muscle tension, and disrupted coordination between your diaphragm and pelvic floor. None of this means you should never engage your core, but there is a meaningful difference between conscious bracing during a heavy lift and spending hours each day pulling your belly button toward your spine to look thinner.

How Stomach-Holding Changes Your Breathing

Your diaphragm is a dome-shaped muscle that sits beneath your lungs. When you breathe in, it contracts and drops downward, pushing your abdominal organs out of the way. That is why your belly naturally expands on an inhale. When you clamp your abdominal muscles tight to flatten your stomach, you physically prevent that downward movement from translating into the normal belly expansion. The diaphragm either can’t descend fully or has to work much harder against the resistance of your contracted abs.

Research on breathing patterns in exercise contexts shows this trade-off clearly. A study of Pilates-style “lateral breathing,” which deliberately restricts abdominal expansion to keep the lumbar spine stabilized, found that in people with chronic obstructive pulmonary disease, this breathing pattern produced no improvement in pulmonary volumes, unlike diaphragmatic breathing that allows the abdomen to move freely.¹ The researchers noted that “respiration is a little restricted because no movement occurs in the abdominal compartment.” Pilates practitioners do this intentionally and briefly during exercise. But imagine sustaining that restriction all day because you’re trying to hold a flat stomach at your desk.

When your diaphragm is blocked from doing its job efficiently, your body compensates by recruiting your upper chest and neck muscles to breathe. You shift from relaxed belly breathing to shallow chest breathing. This pattern is less efficient at gas exchange and tends to increase your baseline level of muscle tension in the neck, shoulders, and upper back. People who chronically chest-breathe often report tension headaches, tight shoulders, and a persistent feeling of not being able to take a satisfying deep breath.

The Difference Between Holding In and Drawing In

Physical therapists teach something called the “abdominal drawing-in maneuver,” and from the outside it might look like stomach-holding. But the two are quite different in what muscles they recruit and how long you sustain them. The drawing-in maneuver specifically targets the transversus abdominis, the deepest layer of your abdominal muscles, which wraps around your torso like a corset. Ultrasound studies have measured how this muscle thickens and shortens during a proper draw-in, confirming that the movement selectively activates deep stabilizers rather than the superficial muscles you’d use to just suck everything in.²

Interestingly, learning to do this correctly is not intuitive. A study that divided 48 healthy people into groups receiving different types of instruction found that getting the draw-in right often required hands-on coaching or real-time ultrasound feedback. People given only verbal instructions frequently performed the exercise incorrectly, reverting to the kind of global stomach-clenching that recruits the wrong muscles entirely.³ This is a telling detail. If trained subjects in a controlled study struggle to draw in without defaulting to stomach-holding, the average person doing it on autopilot all day is almost certainly not selectively engaging the transversus abdominis. They are bracing with their rectus abdominis and obliques, creating a rigid wall of tension rather than a targeted stabilization response.

The therapeutic draw-in is also performed in short, deliberate sets during rehabilitation exercises. It is not a sustained, all-day posture. Using it as one is like doing a bicep curl and never relaxing your arm. Muscles need to cycle between contraction and relaxation to maintain healthy blood flow and avoid fatigue.

What Chronic Tension Does to Abdominal Muscles

When any skeletal muscle is held in sustained contraction for extended periods, it becomes prone to developing myofascial trigger points. These are hyperirritable spots within tight bands of muscle that can produce local and referred pain. The abdominal wall is no exception. Case studies have documented patients presenting with severe anterior abdominal pain that was ultimately traced to myofascial trigger points in the abdominal wall rather than an underlying organ problem.⁴ In one reported case, a patient with a history of Crohn’s disease went through an extensive and difficult diagnostic process before clinicians identified myofascial pain as the actual source of the abdominal symptoms.

This is an underappreciated pitfall of habitual stomach-holding. Abdominal pain that stems from the muscles of the abdominal wall itself can mimic visceral pain, leading people (and sometimes their doctors) down a path of gastroenterological investigations when the real culprit is chronically overworked muscle tissue. The pain can be sharp, deep, and positional, all features that make it look like something more ominous than it is.

Beyond trigger points, sustained abdominal contraction can alter how your trunk muscles coordinate with each other. Research examining trunk muscle activity found that certain exercises increased superficial trunk muscle activity while simultaneously decreasing chest mobility.⁵ Chronic over-recruitment of the superficial abdominal muscles at the expense of deep stabilizers can create an imbalance where the muscles designed for movement end up doing the work of muscles designed for stability, and doing it poorly.

Pelvic Floor Consequences

Your abdominal cavity is a pressure system. The diaphragm forms the top, the abdominal muscles form the sides, and the pelvic floor forms the bottom. When you increase pressure anywhere in that system, it has to go somewhere. Constantly pulling in your stomach raises intra-abdominal pressure in a way that pushes downward onto the pelvic floor. Over time, this sustained downward pressure can contribute to pelvic floor dysfunction, particularly in people who already have some weakness there.

Pelvic floor therapists frequently encounter patients whose symptoms improved only after they stopped the habit of chronic stomach-gripping. The connection is straightforward: a pelvic floor that is constantly being pressed on never gets to rest in its normal resting tone. It either becomes hypertonic (too tight) from bracing against the pressure, or it gradually weakens and descends. Both outcomes can manifest as urinary urgency or leakage, pelvic pain, and difficulty with bowel movements. Women after childbirth and older adults are especially vulnerable, but anyone who spends years creating unnecessary intra-abdominal pressure is adding stress to this system.

This is one of the less intuitive consequences because people assume that a tighter core means a stronger pelvic floor. In reality, the two need to work as a team, cycling between contraction and relaxation in coordination. Locking one part of the system in permanent contraction disrupts the entire coordination pattern.

The Waistband Effect and External Compression

If you’ve ever worn high-waisted compression garments and felt like breathing required more effort, the science backs up that perception. A study measuring intra-abdominal pressure and respiratory mechanics during exercise found that high-waistband garments significantly increased peak abdominal pressure during isometric squatting, from roughly 15 to 17 cmH₂O compared to low-waistband garments.⁶ Interestingly, the high waistbands actually reduced the work of breathing during dynamic squats, possibly because the external compression provided passive support that the muscles would otherwise have to generate themselves.

This creates an informative parallel to stomach-holding. External compression from tight clothing mimics some of the mechanics of voluntary stomach-gripping: both raise intra-abdominal pressure and limit abdominal wall expansion. The key difference is that tight garments do this passively and sometimes reduce muscular work, while voluntary holding requires active and sustained muscle contraction, adding fatigue on top of the pressure changes. Still, people who habitually wear very tight waistbands and also hold their stomachs in are doubling up on abdominal restriction, which amplifies every downstream effect on breathing and pelvic floor pressure.

When Abdominal Engagement Is Actually Helpful

Lest this sound like you should never tighten your abs, there are situations where deliberate abdominal engagement is both safe and beneficial. The important distinction is that healthy engagement is task-specific and temporary.

Singers, for instance, actively use their abdominal muscles to support vocal projection. Research on trained singers found that greater projection involved increased activation of abdominal muscles acting medially, essentially a controlled inward squeeze that helped regulate airflow over the vocal cords.⁷ The singers also maintained a larger rib cage during projection, so the abdominal engagement was part of a coordinated whole-torso effort rather than an isolated clamp.

Weightlifters brace their core before a heavy squat or deadlift, creating a rigid cylinder that protects the spine under load. Pilates practitioners use lateral breathing, limiting abdominal expansion to protect the lumbar region during specific movements.¹ In all of these cases, the engagement lasts seconds to minutes, it serves a functional purpose, and it is released afterward. The body’s complaint is not about engagement itself but about never letting go.

Why the Habit Is So Common

People hold in their stomachs for reasons that are largely social rather than physical. The desire for a flatter-looking midsection is reinforced by mirrors, photographs, and cultural messaging about what a “good” body looks like. Over time, the conscious decision to pull in becomes an unconscious pattern. You may not even realize you’re doing it until someone points it out, or until you try to take a deep belly breath and find that your abdominal wall barely moves.

Some people also confuse stomach-holding with “good posture.” They were told at some point to stand tall and pull their belly in, and they internalized both instructions as a single package. In reality, good posture involves a neutral spine with muscles at their resting lengths, not a rigid torso locked in contraction. Holding your stomach in tends to flatten the lower back, reducing its natural curve and shifting load onto spinal structures that were not designed to bear it in that configuration. Over months and years, this can contribute to lower back discomfort that seems to have no clear cause.

Another group prone to this habit is people recovering from abdominal surgery or dealing with abdominal conditions like irritable bowel syndrome, who develop a guarding response. Guarding is a protective muscle contraction around a painful area, and it makes sense in the short term. But if the guarding persists long after the pain stimulus has resolved, it becomes its own source of dysfunction. The muscles remain tense, the breathing stays shallow, and the person may not connect the two because the original injury or illness is what they associate with their symptoms.

How to Tell If You’re Doing It

A simple self-check: lie on your back with your knees bent and place one hand on your chest and the other on your belly. Breathe normally without trying to change anything. If the hand on your belly barely moves while the hand on your chest rises and falls with each breath, you are likely a habitual chest-breather, and chronic stomach-holding may be the reason. In relaxed breathing, the belly hand should rise gently on the inhale and fall on the exhale.

Another clue is whether your abdominal wall feels firm to the touch when you’re just sitting around doing nothing. A relaxed abdomen should have some give. If yours feels like you’re perpetually flexing, you have trained those muscles into a default state of contraction. Try deliberately releasing your belly and letting it expand. If this feels vulnerable, uncomfortable, or “wrong,” that reaction is itself evidence that the habit runs deep.

Breaking the pattern takes conscious effort and feels counterintuitive at first. Diaphragmatic breathing practice, where you deliberately direct your breath into your belly and let it expand, is the most straightforward tool. A few minutes of belly breathing several times a day can start to retrain the default pattern. Some people also benefit from working with a physical therapist, especially if they have developed pelvic floor symptoms or chronic abdominal pain that may be related to the habit. As the research on abdominal hollowing exercises demonstrated, proper engagement patterns are difficult to learn from verbal instructions alone, so hands-on guidance can make a real difference.³

Stomach-Holding in Children and Adolescents

Adults are not the only ones who develop this habit. Adolescents navigating body image pressures frequently begin holding in their stomachs as a way to control how they look, sometimes as young as their early teens. Because their musculoskeletal systems are still developing, sustained postural habits adopted during this period can become deeply ingrained. A teenager who spends several years holding their stomach in may enter adulthood with breathing and posture patterns that feel completely normal to them, making the habit invisible and harder to correct later.

Parents and coaches sometimes reinforce the pattern inadvertently by praising “tight cores” or encouraging kids to “suck it in” for sports or dance. In athletic contexts where brief core engagement is appropriate, this cue gets misapplied as a sustained posture. Teaching young athletes the difference between momentary bracing for a specific movement and chronic tension could prevent a lot of the downstream problems that present in adults. The goal is a core that activates when needed and relaxes when it is not, responsive rather than rigid.