Diastasis recti typically looks like a visible bulge or ridge running down the center of your abdomen, most noticeable when you engage your core muscles. It’s an oval-shaped protrusion that appears between your breastbone and belly button, caused by the two halves of your abdominal muscles separating along the midline connective tissue. The appearance can range from subtle (a slight pooch that won’t flatten no matter how much you exercise) to dramatic (a pronounced dome or cone shape that pops up when you sit up in bed or lift something heavy).
The Signature Look: Doming and Coning
The most recognizable sign of diastasis recti is what physical therapists call “coning” or “doming.” When you contract your abs, lean back in a chair, cough, or do a crunch, a ridge or tent-like shape pushes outward along the vertical center of your belly. This happens because the connective tissue between the two sides of your abdominal muscles has stretched and thinned, so when pressure builds inside your abdomen, it pushes through that weakened midline rather than being held flat.
At rest, diastasis recti often looks like a persistent belly pooch centered around or just above the navel. Many people describe it as looking pregnant months or years after delivery, or as a soft, protruding belly that doesn’t respond to diet or exercise. In some cases, you can actually see the outline of your intestines pressing through the gap when you strain or sit up, though this is more common with wider separations.
How It Differs From a Hernia
Since both conditions cause a visible abdominal bulge, it’s easy to confuse diastasis recti with a hernia. The differences are fairly reliable, though. Diastasis recti produces an oval-shaped bulge that runs vertically between the breastbone and belly button and is not painful. A hernia, on the other hand, creates a more localized, rounded protrusion at a single point on the abdomen or groin, and it often causes pain at the bulge site.
Another key distinction: a hernia bulge can be visible even at rest, while diastasis recti is most apparent during exertion (sitting up, lifting, coughing). Hernias also tend to hurt during bowel movements, sneezing, or heavy lifting. If your bulge is painful, that’s a sign to get it evaluated for a possible hernia rather than assuming it’s a simple muscle separation.
How to Check Yourself
You can get a rough sense of whether you have diastasis recti with a simple finger-width test at home. Here’s how:
- Step 1: Lie on your back with both knees bent and feet flat on the floor.
- Step 2: Place your index and middle fingers side by side, pointing toward your feet, directly above your belly button.
- Step 3: Slowly raise your head and shoulders off the floor (like the start of a crunch) and feel for a gap or dip under your fingers along the midline.
- Step 4: Lower back down and note how many fingers fit into the gap.
One finger width of separation or less is considered normal. A gap of two or more finger widths (roughly 2.5 centimeters or just under an inch) indicates diastasis recti. Some people find a gap of four or more finger widths, which represents a significant separation. Repeat the test at three spots: just above your belly button, at the belly button, and just below it, since the gap can vary along its length.
Mild, Moderate, and Severe Separation
Not every case of diastasis recti looks the same, and the severity depends on how far apart the muscles have drifted. A classification system proposed by the European Hernia Society breaks it down by the width of the gap between muscles:
- Mild: Less than 3 cm (about 1.2 inches). This may look like a slight ridge during crunches and a persistent soft belly at rest, but it’s often not obvious to other people.
- Moderate: 3 to 5 cm (roughly 1.2 to 2 inches). The doming becomes more visible during everyday activities like getting out of bed. The belly tends to protrude noticeably, especially in the upper abdomen.
- Severe: Over 5 cm (more than 2 inches). The midline bulge is often visible even with minimal exertion. The belly may look significantly distended, and core stability is usually compromised enough to affect posture and daily movement.
Clinicians confirm these measurements using ultrasound, which also lets them assess whether the connective tissue has thinned and whether the gap narrows or widens when you engage your core. A gap that narrows with muscle activation is generally a better sign than one that stays the same or gets wider.
Who Gets It and How Common It Is
Diastasis recti is most associated with pregnancy, and the numbers reflect that. An estimated 66 to 100 percent of women have some degree of abdominal separation during the third trimester. Immediately after childbirth, about 83 percent of women show a measurable separation, with roughly 55 percent of those cases classified as severe. By three to six months postpartum, about 42 percent of severe cases persist. Overall prevalence drops to around 36 percent when measured well after delivery, meaning the gap does close on its own for many women, but not all.
Men and people who have never been pregnant can also develop diastasis recti. Repeated heavy lifting, significant weight gain (especially visceral belly fat), and chronic conditions that increase abdominal pressure (like a persistent cough) all stretch the midline connective tissue over time. In men, it often looks like a firm, rounded belly that bulges more prominently in the upper abdomen during exertion.
What It Feels Like Beyond Appearance
Diastasis recti isn’t just cosmetic. Because the abdominal wall functions as a single unit to stabilize your spine and pelvis, a significant separation can cause low back pain, a feeling of weakness or instability in your core, and difficulty with movements that require trunk rotation or bracing. Some people notice their posture shifts, with the pelvis tilting forward and the lower back arching more than usual to compensate for the weakened front wall.
Pelvic floor symptoms are also common alongside diastasis recti, particularly in postpartum women. The abdominal wall and pelvic floor work together as a pressure system, so when one weakens, the other often shows strain too. This can show up as urinary leakage during sneezing or jumping, or a feeling of heaviness in the pelvis.
Exercises That Make It Visible
Certain movements make diastasis recti much more obvious and can actually worsen the separation. Any exercise that causes your abdominals to bulge outward, cone, or dome is putting pressure through the weakened midline rather than strengthening it. Classic examples include full sit-ups, crunches, and planks performed before the deep core muscles are strong enough to maintain tension across the gap. If you see a ridge or dome appear along your midline during any exercise, that’s a clear visual signal the movement is too advanced for your current level of core integrity.
Rehabilitation typically focuses on retraining the deep core muscles (the ones that wrap around your torso like a corset) to restore tension across the connective tissue before progressing to more demanding movements. Many people see measurable improvement in gap width and a flatter resting appearance within several weeks of targeted work with a pelvic floor physical therapist.