WHAT IS DIASTASIS RECTI?
Diastasis recti is the separation of the two rectus abdominis muscles along the linea alba, the connective tissue that runs down the centre of the abdomen. It often occurs during pregnancy and usually recovers within 6 to 8 weeks postpartum. If the gap remains, it may lead to visible bulging or doming in the abdomen during movement. It is common during late pregnancy and can persist months after birth.
Before Diastasis Recti vs After: What Really Changes
Before diastasis recti, the core functions as a well-integrated unit, efficiently transferring force and maintaining pressure balance for everyday movement. Afterward, the loss of midline tension disrupts this harmony, leading to reduced stability, altered movement patterns and a greater tendency for abdominal doming under strain.
🌷 Physio Insight
When we assess diastasis recti, we look at how the linea alba behaves both under tension and at rest to see if your muscles are working as they should. If they are, the goal isn’t necessarily to close the gap, but to activate the right muscles to manage intra-abdominal pressure effectively. When this coordination is present, we consider it a functional recovery.
Core Structure Before Diastasis Recti
The rectus abdominis muscles run vertically on either side of your abdomen and are connected in the middle by the linea alba. Underneath are deeper muscles, including the transversus abdominis and the internal and external obliques. These muscles work closely with the pelvic floor muscles and diaphragm to form a strong core system that supports posture, assists with breathing and keeps your pelvic organs well supported.
Core Structure After Diastasis Recti
After diastasis recti develops, the linea alba becomes overstretched and thinner. This loss of tension allows the muscles to drift apart, creating a gap in the midline of the abdomen. The abdominal wall loses its ability to stabilise the core and manage pressure effectively, leading to a bulge or doming along the midline.
Signs and Symptoms of Diastasis Recti
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Changes in abdominal shape
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Difficulty engaging the core
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Midline bulge when straining
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Core weakness, reduced strength and control
Visible Midline Bulge
A visible midline bulge, often called “doming,” appears as a ridge or cone-shaped protrusion running down the centre of the abdomen. It typically becomes more noticeable when sitting up from a lying position, doing a sit-up-like movement, or straining during activities that increase abdominal pressure (such as coughing, sneezing, or lifting).
This happens because the connective tissue along the midline, known as the linea alba, becomes stretched and weakened. When the deeper core muscles aren’t fully supporting the abdominal wall, internal pressure pushes outward, causing the tissue to rise or “dome.”
🌷 Physio Insight
Doming appears when the tissues can’t manage internal pressure, showing up where the core is most relaxed or weak. It doesn’t always mean you must avoid that movement. Instead, try different strategies to reduce it while keeping good form. How much it matters depends on your symptoms and daily needs, and your physiotherapist can guide you on what’s safe and effective for your goals.
Core Weakness
Core weakness means the deep abdominal and supporting muscles are not providing enough stability to the trunk. When this happens, your body loses some of its natural support for posture, balance, and movement control. Without this support, even basic actions like bending over, standing up from a chair, or carrying a child can feel harder and less controlled.
Everyday activities may also place more strain on other parts of the body, like the lower back or hips, because they’re compensating for the lack of core strength. This can lead to fatigue, discomfort, or an increased risk of injury during daily movements or exercise.
🌷 Physio Insight
Simple posture adjustments can make a surprising difference. When you exhale gently as you lift or stand, your deep abdominals and pelvic floor work together to stabilise your spine and reduce strain. It’s one of the first cues we teach in postpartum sessions.
Postural Changes
Weak core muscles reduce the stability and support needed to keep the spine in an upright, neutral position. Without sufficient engagement from the deep abdominals and spinal stabilisers, the pelvis can tilt forward or backward, causing the upper body to collapse into a slouched posture. Over time, this poor alignment alters the natural curves of the spine, placing extra strain on supporting muscles and ligaments.
Secondary Symptoms
Core instability can cause surrounding areas to overcompensate, leading to:
- Lower back pain: Extra strain on spinal muscles and ligaments
- Pelvic floor issues: Poor coordination causes heaviness or dysfunction
- Incontinence: Reduced pressure control affects bladder support
- Hip pain: Instability forces hips to take on excess load
Without a stable core, pressure and force are unevenly distributed. This creates stress on nearby structures and results in pain or dysfunction.
How to Check for Diastasis Recti
Early detection is important to prevent worsening separation, protect your core, and guide safe exercise choices.
Self-Check Method
Use the finger-width test to check for diastasis recti:
- Lie on your back with knees bent, feet flat.
- Relax and place your fingers horizontally on your midline, just above the belly button.
- Lift your head slightly to engage your abs.
- Feel for a gap, moving fingers along the midline from xiphoid process to pubic bone.
- Count how many fingers fit between the muscles and note how deep the gap feels.
- 1 finger or less: Usually normal
- 2 fingers or more: May indicate diastasis recti
- Deeper, soft gaps: Suggest weaker connective tissue
🌷 Physio Insight
When doing a self-check, pay attention to both the width and depth of the gap. A shallow, firm midline usually means your connective tissue is strong. A deep, soft gap suggests the tissue still needs time and guided strengthening to rebuild its support.
When to See a Professional
It’s best to seek medical or physiotherapy evaluation if you notice:
- A gap of two or more fingers that doesn’t improve over time.
- Bulging or doming that worsens during daily activities.
- Pain, discomfort, or instability in your core, hips, or lower back.
- Pelvic floor symptoms, such as heaviness, leakage, or pressure.
A women’s health physiotherapist can perform a thorough assessment to confirm the degree of muscle separation and tissue support. They can create a tailored rehabilitation plan, focusing on safe, effective exercises and lifestyle modifications to help close the gap, strengthen your core and prevent further strain.
Tools for Diagnosis
Professionals may use specific tools to assess diastasis recti more accurately than a self-check:
- Calipers or Ruler: These measure the distance between the two sides of the abdominal muscles with greater precision than finger-width estimates.
- Real-Time Ultrasound: Used as biofeedback to measure the gap width and assess deep core muscle activation to help guide effective rehabilitation.
🌷 Physio Insight
Measuring diastasis recti can be quite subjective because everyone’s finger size is different. That’s why it’s best if the same clinician performs both the initial and follow-up assessments. More importantly, we don’t just focus on how wide the gap is, because what truly matters is how well the tissue can generate tension and support the core during movement.
Causes and Risk Factors
Diastasis recti happens when the linea alba is stretched or weakened. Common contributors include:
- Pregnancy: Increased pressure and hormonal softening of tissues.
- Multiple or large pregnancies: Repeated or excessive stretching of the abdominal wall.
- Heavy lifting or unsafe core exercises: Added strain on the midline.
- Genetics or age: Naturally weaker or less elastic connective tissue.
- Excess weight: Constant outward pressure on the abdomen.
Pregnancy-Related Causes
During pregnancy, several changes place increased strain on the linea alba:
- Expanding uterus: As the baby grows, the abdominal wall stretches to make space, pulling the two sides of the rectus muscles apart.
- Hormonal changes: Hormones like relaxin and progesterone soften connective tissues and ligaments, reducing their ability to hold the muscles tightly together.
- Stretching of the linea alba: Continuous pressure weakens this midline tissue, making it thinner and less supportive, which can lead to or worsen separation.
🌷 Physio Insight
You can’t always prevent abdominal separation during pregnancy, but you can influence how well your body manages pressure. Regular breathing work, gentle core activation and mindful movement help protect the linea alba as your bump grows.
Risk Factors
Certain conditions can place extra strain on the abdominal wall, increasing the likelihood of diastasis recti:
- Multiple pregnancies
- Large baby or multiple births
- Short recovery time between pregnancies
- Advanced maternal age
- Short torso
- Excess weight gain
- Intense pushing during labour
Non-Pregnancy Causes
Diastasis recti can also develop outside of pregnancy when repeated strain weakens the midline:
- Chronic heavy lifting
- Obesity
- Persistent coughing
Diastasis in Infants
Newborns can show a small gap along the midline of the abdomen because their abdominal muscles are not yet fully developed or connected. This often appears as a soft bulge or ridge, especially when the baby strains or cries.
In most cases, this condition is harmless and resolves naturally as the baby grows. As their core muscles strengthen and the linea alba tightens during early development, the separation usually closes on its own without treatment.
Severity and Potential Complications
The severity of diastasis recti plays a key role in determining the type and duration of treatment required for recovery. A small, mild separation may resolve with guided rehabilitation and lifestyle adjustments, while a larger or more persistent gap often needs more targeted physiotherapy and longer-term care to rebuild strength and stability. If left unmanaged, diastasis recti can lead to both physical and emotional consequences.
🌷 Physio Insight
A small gap doesn’t always mean it’s “mild.” At Calyx, we also observe how your core behaves when you cough, lift, or roll in bed. If the midline bulges or feels unsupported, it tells us your tissue isn’t coping with load yet, even if the gap seems small.
Mild vs Severe Diastasis Recti
Mild: 1 to 2 finger-widths
Moderate to Severe: 3 or more finger-widths
The depth of the separation also matters. A deeper, softer midline usually signals poorer tissue integrity and slower recovery, even if the width is moderate.
Associated Issues
Diastasis recti can lead to or contribute to several complications if not addressed:
- Umbilical hernia
- Pelvic instability
- Chronic back pain
- Constipation
- Poor posture
Prevention and Long-Term Care
Preventing or minimising diastasis recti begins with safe movement habits, good posture, and targeted core exercises.
During Pregnancy
During pregnancy, gentle activation of the deep core helps support the abdominal wall as it stretches.
🌷 Physio Insight
A simple cue we teach during pregnancy is: “Blow before you go.” Exhale gently before standing up, rolling, or lifting. This trains your core and pelvic floor to activate together, reducing unnecessary pressure on the abdominal wall.
Postpartum Recovery
In the early postpartum phase, it’s important to reintroduce movement gradually, starting with breath work and gentle core activation.
Ongoing Core Health
Long-term, maintaining core integrity relies on consistent strengthening and healthy movement patterns.
What’s next?
Exercises for Diastasis Recti
Rehabilitation for diastasis recti starts with foundational core exercises that safely activate the deep abdominal muscles without straining the linea alba.
🌷 Physio Insight
There’s no single exercise you can’t do. However, your body has been through so much during pregnancy and birth, so we always begin with the foundation exercises. These may feel like the less exciting movements, but they’re essential. By rebuilding from within, your body learns to manage pressure and handle higher loads safely and effectively.
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Abdominal BracingAbdominal bracing is a gentle core contraction that activates the deep abdominal muscles without bulging or bearing down.
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Diaphragmatic BreathingDeep, diaphragmatic breathing promotes core coordination and pressure regulation.
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pelvic tiltsPelvic tilts involve gentle movement of the pelvis while lying down, engaging the deep core and pelvic floor muscles.
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supine marchesSupine marches involve lifting one leg at a time while lying on your back, keeping the core engaged.
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heels slidesHeel slides involve sliding one heel along the floor while keeping the pelvis stable.
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modified planksModified planks are performed with knees down to reduce pressure on the abdominal wall.
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Side-Lying Leg LiftsThis exercise involves lifting the top leg while lying on your side, which strengthens the obliques and hip stabilisers.
Treatment for Diastasis Recti
Treatment for diastasis recti involves a personalised physiotherapy programme focused on restoring core control, rebuilding connective tissue strength, and addressing any related issues such as back pain or pelvic floor dysfunction.
If you are concerned about diastasis recti or need professional support, visit our Diastasis Recti Treatment page to learn more about how we can help.
