A gap and a hole are not the same thing
Both show up around the belly button after a baby. Only one of them belongs to a surgeon.
Quick answer
Diastasis recti is a widening of the connective tissue that runs down the middle of your abdomen, called the linea alba. The tissue stretches and thins, but it stays intact. There is no hole. It usually feels like a soft, wide valley along your midline, often with a ridge or dome when you lift your head, and it is normally painless.
An umbilical hernia is different. It is an actual weakness or opening in the abdominal wall, usually at or just beside the navel, that lets fat or a piece of bowel push through. The NHS describes it as a bulge caused by part of the bowel or surrounding fat pushing through a weakness in the muscles. It usually feels like a distinct, rounded lump that can appear when you cough, strain or stand and may flatten when you lie down.
You can have both at once, and Cleveland Clinic lists umbilical hernia among the possible complications of severe or untreated diastasis recti. Only a GP, and sometimes an ultrasound, can tell you which one you have. If a lump ever becomes hard, very painful or will not flatten, treat that as urgent.
of women still had diastasis recti at 6 weeks postpartum (Sperstad et al., 2016)
still had it at 6 months postpartum in the same study
still had it at 12 months, so a midline gap is common and rarely urgent
The difference, in plain English
Picture the front of your abdomen as two vertical panels of muscle with a seam running between them. That seam is the linea alba, a band of connective tissue rather than muscle. We wrote a whole piece on what the linea alba actually is and why it matters, but the short version is that it is the join, not the wall itself.
In diastasis recti, pregnancy stretches that seam sideways. It becomes wider and thinner, so the two panels sit further apart. The seam is stretched, not broken. Nothing is coming through it.
In an umbilical hernia, there is a genuine gap in the abdominal wall, most often at the navel where the tissue is naturally thinner because of where your own umbilical cord attached. Something on the inside, usually a bit of fatty tissue, sometimes a loop of bowel, pushes out through that gap. That is why it presents as a lump rather than a valley.
The distinction matters because the answers are completely different. A stretched seam responds to loading it well over time. A hole in the wall does not close with exercise, and in adults the NHS notes that repair is usually recommended because of the risk of complications.
What diastasis recti tends to feel like
Lie on your back with your knees bent, press your fingers into the midline just above your navel, and lift your head a little. With a separation you will usually feel your fingertips sink into a soft, springy trough that runs up and down the midline, with firmer muscle on either side. It is a width you can measure in fingers, not a lump you can outline.
Other common signs are a midline ridge or dome that pops up when you sit up, cough or lift something heavy, a belly that still looks pregnant months later, and a sense that your middle is not connecting when you try to brace. That doming has its own vocabulary, which we untangle in coning versus doming and what each one is telling you. If you have not checked yet, our at-home self-test walks through it step by step.
Diastasis recti is usually not painful in itself, though it often travels with back or pelvic discomfort because the whole system is working differently.
What an umbilical hernia tends to feel like
A hernia announces itself as a lump. It has edges. You can often trace where it starts and stops, and it commonly sits right at the belly button, sometimes making an "outie" out of what used to be an "innie".
Typical features include a bulge that becomes more obvious when you cough, strain, laugh or stand up, and that may soften or disappear when you lie flat. The NHS notes that adult umbilical hernias range from around 1cm to more than 4cm, that most are painless, but that adults may feel discomfort when coughing or straining.
The other tell is that it does not behave like a gap. A separation feels the same whether you are standing or lying down. A hernia often changes with position and pressure, because what you are feeling is contents moving in and out.
Side by side
| Diastasis recti | Umbilical hernia | |
|---|---|---|
| What it is | Stretched, widened connective tissue at the midline | An opening in the abdominal wall with tissue pushing through |
| What you feel | A soft, wide valley running up and down the midline | A distinct, rounded lump with edges, usually at the navel |
| Does it change with position? | Broadly the same lying down or standing | Often bulges when standing or straining, flattens lying down |
| Pain | Usually painless on its own | Often painless, but can ache with coughing or straining |
| Does exercise help? | Yes, progressive core loading is the mainstay | No, exercise does not close a hernia |
| Who confirms it | GP or women's health physiotherapist, by hand | GP, often with an ultrasound scan |
| Usual management | Rehabilitation over months | Surgical repair is commonly recommended in adults |
Can you have both at once?
Yes, and it is not unusual. The two conditions live in the same neighbourhood. When the midline tissue is stretched and thin, the naturally weaker spot at the navel is under more strain, which is why Cleveland Clinic lists umbilical hernia among the possible complications of severe or untreated diastasis recti.
In practice this means a wide separation does not rule a hernia out, and a hernia does not mean your separation is imaginary. If you can feel both a broad soft gap and a discrete lump, mention both to your GP. It also means that if you are considering any kind of repair, the assessment should look at the whole midline rather than one feature of it. We covered that decision in diastasis recti surgery versus exercise.
Red flags: when this stops being a wait-and-see
Most abdominal changes after a baby are not emergencies. These are the exceptions, and they come straight from NHS guidance on umbilical hernia. Seek emergency care immediately if you have a hernia and develop:
- severe tummy pain that does not go away
- nausea or vomiting, or you cannot keep food down
- a lump that suddenly becomes larger, firmer or discoloured
- a lump that will not flatten or push back in when it previously did
- an inability to pass wind or open your bowels
Together these can indicate a strangulated hernia, where the blood supply to the trapped tissue is cut off. That is a medical emergency, not something to sleep on. Outside of those signs, a new or growing lump still deserves a routine GP appointment rather than a wait of several months.
The one-line rule of thumb
A valley is usually a separation. A lump is a question for your GP. If you are feeling a lump, do not start guessing with exercises, get it looked at first.
What to do next
If everything you can feel is a soft, even gap along the midline with no discrete lump and no pain, you are almost certainly dealing with a straightforward postpartum separation, and the answer is patient, progressive core work rather than crunches. Start with breath and deep-core connection, then build. Our guide to telling a mum pooch from a separation is a useful next read if your main concern is how your belly looks rather than how it feels.
If you can feel a lump, or anything changes with position, book a GP appointment before you start any programme. Getting a name for what you have is not being dramatic, it is the step that makes everything after it safe.
And if you are weighing up which programme to follow once you have been cleared, we compared the main options honestly, including the difference between paying monthly and paying once, in The Tummy Team versus Mumma Glow.
When you are cleared to start
Core Reconnect is our one-time deep-core and diastasis recti guide, built around short sessions that fit around a baby. Buy it once, keep it forever. Use code GLOW20 for 20% off.
Frequently asked questions
How do I know if it is diastasis recti or a hernia?
The simplest distinction is valley versus lump. Diastasis recti feels like a soft, wide trough running up and down your midline, roughly the same standing or lying down, and is usually painless. An umbilical hernia feels like a distinct rounded lump with edges, typically at the navel, that often bulges when you stand, cough or strain and may flatten when you lie flat. Only a GP, sometimes with an ultrasound, can confirm which you have.
Can exercise close an umbilical hernia?
No. A hernia is an opening in the abdominal wall, and exercise does not close it. Core work may help you manage pressure better, but it is not a repair. The NHS notes that surgical repair is usually recommended for adults because of the risk of complications.
Can you have diastasis recti and an umbilical hernia together?
Yes. The two often sit in the same area of a stretched midline, and Cleveland Clinic lists umbilical hernia among the possible complications of severe or untreated diastasis recti. If you can feel both a broad gap and a discrete lump, mention both when you see your GP.
Is a bulge at my belly button after pregnancy dangerous?
Usually not immediately, but it should be assessed. Seek emergency care straight away if the lump becomes hard, very painful or discoloured, will not push back in, or comes with vomiting or an inability to pass wind, as these can signal a strangulated hernia. Otherwise book a routine GP appointment rather than waiting it out.
Should I stop exercising if I think I have a hernia?
Pause anything that makes the bulge more obvious, such as heavy lifting, crunches or straining, and speak to your GP before continuing. Gentle walking is generally fine, but get individual advice rather than following a general programme until you know what you are working with.
Sources: NHS, "Umbilical hernia repair", nhs.uk. Cleveland Clinic, "Diastasis Recti", my.clevelandclinic.org. Sperstad JB et al., "Diastasis recti abdominis during pregnancy and 12 months after childbirth", British Journal of Sports Medicine, 2016.
This article is general education, not medical advice, and it cannot diagnose you. Results vary from mum to mum. Please see your GP, midwife or a women's health physiotherapist about any lump, bulge, pain or change in your abdomen, and seek emergency care immediately if you have severe abdominal pain, vomiting, or a lump that becomes hard, discoloured or will not flatten.