Abdominal diastasis: beyond aesthetics

Most of the patients who come to me worried about diastasis think of it as a cosmetic problem — the "belly that never went back to normal" after pregnancy. I understand why: that's how it's usually framed on social media. But the science paints a more interesting, and more honest, picture than that.

What diastasis actually is

Diastasis is the separation of the rectus abdominis muscles along the midline — the linea alba, the strip of connective tissue that holds them together. The European Hernia Society technically defines diastasis as a linea alba wider than 2 cm. And it's extremely common: nearly every woman shows some degree of it by the end of pregnancy, and 30-68% still have it postpartum. That's worth saying upfront: having diastasis is not, by itself, having a disease. Much of it resolves on its own or stays entirely symptom-free.

What the science actually shows about pain and function

Here I'd rather be honest than sell a simple story: the relationship between diastasis and back pain, incontinence, or pelvic floor dysfunction is genuinely contested in the scientific literature. A recent systematic review of 13 studies and nearly 2,800 patients found split results — about 61% of the included studies found no association between diastasis and low back pain, and 38% did. Another review, with over 2,200 participants, found no significant association between diastasis and lumbopelvic pain or incontinence overall — but it did find a relationship between the width of the separation (not just its presence) and worse quality of life, lower abdominal strength, and more back pain.

One finding I find especially useful for explaining this to patients: in a study of 224 postpartum women, a wider diastasis appeared, at first glance, to correlate with more difficulty running or doing physical work — but that association disappeared once the study adjusted for BMI and number of pregnancies. In other words, the size of the gap alone is a poor thermometer for how affected a given person actually is. Symptoms and functional testing say more than centimeters do.

Physiotherapy first, in most cases

The European Hernia Society guidelines are clear on this point: physiotherapy should be tried before surgery is considered. A meta-analysis pooling 34 randomized trials and more than 1,500 postpartum women showed abdominal exercise reduces diastasis — isotonic exercise, in particular, had a significant effect, which wasn't the case for isometric exercise alone. That's why, in my own practice, I rarely consider surgery unless a patient has already gone through a well-guided physiotherapy program.

When surgery makes a real difference

Surgery comes into play when diastasis is genuinely symptomatic — pain, a sense of core instability, an associated hernia — and hasn't responded to an adequate trial of conservative treatment. And here the data is more encouraging: a study of 60 women with symptomatic diastasis resistant to physiotherapy showed self-reported functional improvement in 98% of them after surgery, with consistent gains in quality of life and even in urinary symptoms. A randomized trial comparing two surgical techniques — retromuscular mesh and double-row suture — showed both reduced pain and objectively improved muscle strength, with no meaningful difference between them.

This isn't about "looking pretty" — it's about restoring function. It's worth saying, with the same honesty: the complication rate for diastasis repair runs around 17% (mostly seroma and wound-healing issues), which has to factor into any decision.

My view on the matter

I don't treat diastasis as an automatic decision — not toward physiotherapy, and not toward surgery. I assess whether there are real symptoms, whether there's already been a genuine attempt at conservative treatment, and how much it's actually limiting the patient day to day. When the answer points toward surgery, I try to be clear about what the evidence actually supports — function, not just appearance — and about the risks involved. If you feel your diastasis goes beyond what shows up in the mirror, that's exactly the kind of evaluation I like to do, unhurried, in the office.