Quick answer: Diastasis recti — the separation of the two halves of the rectus abdominis muscle along the linea alba — affects approximately 60% of women in the third trimester and up to 45% at 6 months postpartum.
Diastasis recti — the separation of the two halves of the rectus abdominis muscle along the linea alba — affects approximately 60% of women in the third trimester and up to 45% at 6 months postpartum. It’s often discussed in alarming terms online, but the reality is more nuanced: many cases are minor and functionally unimportant, while others contribute significantly to back pain, pelvic floor dysfunction, and difficulty with everyday movements.
What Diastasis Recti Is and Isn’t
The rectus abdominis runs in two vertical parallel columns from the pubic bone to the sternum, connected by the linea alba — a band of connective tissue running down the midline. During pregnancy, the growing uterus stretches and thins the linea alba, causing the two muscle bellies to separate. Some degree of separation is normal and expected in pregnancy. The distinction between normal variation and clinically significant diastasis recti is not just about the width of the gap (measured in finger-widths or centimetres) but about the tension and depth of the tissue. A gap with good fascial tension (the tissue feels firm and spring-like when you press) may be functionally fine even if wider; a narrower gap with poor tension (tissue feels soft and gives way under pressure like pressing into dough) may cause more functional impairment.
How to Check Yourself
The self-check: lie on your back with knees bent and feet flat. Place your fingertips horizontally across the midline at your navel. Gently lift your head and shoulders as if doing a small crunch. Feel for a gap between the two muscle bellies and note: how many fingers fit in the gap (width); whether the tissue under your fingers is firm and spring-like (good tension) or soft and gives way (poor tension). Repeat at 5cm above and 5cm below the navel — diastasis recti is often most pronounced at the navel but the full extent matters. A gap wider than 2 finger-widths above the navel, 2.5 at the navel, or 2 below, combined with poor tension, is generally considered significant. But this self-check is a screening tool, not a diagnosis — a women’s health physiotherapist can assess properly.
What Not to Do If You Have Diastasis Recti
Several exercises increase intra-abdominal pressure in ways that worsen diastasis and should be modified or avoided until the issue is addressed: full sit-ups and crunches; double leg lowers (lifting both legs while lying on your back); forward-loaded exercises that create ‘doming’ (a peak or ridge appearing at the midline during effort); heavy lifting with breath-holding; and some yoga poses like cobra or wheel that extend the spine and stretch the midline under load. These aren’t permanently off-limits — they’re movements to avoid until the linea alba has adequate tension and you’ve rebuilt functional abdominal control with appropriate exercises.
What Actually Rehabilitates It
Effective diastasis rehabilitation focuses on rebuilding intra-abdominal pressure management and improving linea alba tension — not just strengthening the rectus abdominis in isolation. Key approaches: deep core activation (learning to co-activate the transversus abdominis, pelvic floor, and diaphragm as an integrated pressure management system); progressive loading with appropriate breathing strategy (exhale on exertion, never Valsalva/breath-holding); and functional movement patterns that challenge the core in the positions where you use it daily. A physiotherapy-led programme is significantly more effective than online exercise programmes for significant diastasis — the assessment of load, tension, and breathing mechanics requires hands-on expertise. Most private insurance and some NHS pathways cover women’s health physiotherapy.
Frequently Asked Questions
Will diastasis recti get better on its own?
Mild cases (gap less than 2 finger-widths, good tissue tension) often improve significantly in the first 12 months postpartum without specific intervention, particularly with general activity and appropriate core use. Moderate to severe cases, or cases with poor linea alba tension, are unlikely to fully resolve without targeted rehabilitation. The research shows that core rehabilitation significantly improves outcomes compared to no treatment.
Can diastasis recti cause back pain?
Yes — the linea alba is part of the deep core stabilisation system. When it lacks tension, the load-transfer mechanism that distributes forces through the trunk is compromised, placing increased demand on the back extensors and other compensatory structures. Lower back pain, pelvic girdle pain, and hip pain can all be associated with significant diastasis.
Can I run or do HIIT with diastasis recti?
Not without assessment. High-impact activities and heavy exertion significantly increase intra-abdominal pressure — without adequate linea alba tension to manage this load, you risk worsening the separation and causing pelvic floor symptoms. A women’s health physiotherapist can assess your readiness for high-impact activity specifically. The general guideline is to achieve good functional deep core activation before returning to high-impact exercise, regardless of gap size.
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