Pain under the breast when breathing can sometimes come from the ribs, chest-wall muscles or surrounding tissues, but pain that worsens with breathing can also have other causes that require medical evaluation.
A woman may notice pain under her breast when taking a deep breath, stretching, or turning in bed.
The sensation can be sharp, pulling, aching, or tender.
Sometimes, it feels as though the pain is coming from the breast itself.
Quick Answer
Pain under the breast when breathing can sometimes come from the muscles, ribs, cartilage, or joints of the chest wall. Common musculoskeletal causes include intercostal muscle strain, chest muscle irritation, costochondritis, rib joint stiffness, and pain following repeated coughing. However, sudden, severe, or unexplained pain with breathing should be medically assessed rather than automatically assumed to be muscular.
However, the ribs, intercostal muscles, chest muscles, cartilage, and joints around the chest can also create pain in this area.
Breathing makes the chest wall move continuously.
When one of these structures is irritated, even a normal breath can make the discomfort more noticeable.
Key Takeaways
Why Can Breathing Cause Pain?
Breathing involves much more than the lungs.
Every breath makes the ribs move outward and inward.
The muscles between the ribs and other chest-wall structures help control this movement.
If these tissues are strained or irritated, expanding the rib cage can reproduce the pain.
Musculoskeletal chest-wall pain can be associated with movement, physical activity, coughing, or tenderness around the affected area (Cambridge University Hospitals).
This is why some people notice the pain more during a deep breath than during quiet breathing.
It may also become noticeable when coughing, sneezing, laughing, or reaching overhead.
Intercostal Muscle Strain
The intercostal muscles are located between the ribs.
They help control the movement of the rib cage during breathing and become particularly active during forceful breathing, coughing, and physical activity.
A sudden twist, heavy lift, intense workout, or prolonged coughing episode can place extra stress on these muscles.
The resulting pain may be felt under the breast, along the side of the chest, or between the ribs.
Deep breathing can stretch the irritated muscle and reproduce the discomfort.
The pain may also appear when rotating the upper body, getting out of bed, reaching overhead, or pushing something.
Chest Muscle Strain
The pectoral muscles cover the front of the chest.
They are involved in movements such as pushing, lifting, bringing the arm across the body, and stabilising the shoulder.
A demanding chest workout or repetitive lifting can therefore leave these muscles sore.
The discomfort may sometimes be felt around the breast or underneath it rather than directly over the muscle.
A strained chest muscle can become more noticeable when the rib cage expands during a deep breath.
Musculoskeletal problems of the chest wall are also recognized in physically active people, particularly when repetitive or strenuous activity places increased demand on the chest and surrounding structures (Gregory et al., 2002).
Costochondritis and Rib Cartilage
Costochondritis involves irritation of the cartilage connecting the ribs to the breastbone.
It commonly causes pain toward the front of the chest.
The discomfort can become more noticeable with deep breathing, coughing, sneezing, or certain upper-body movements.
Some people also experience tenderness when the area is pressed.
Costochondritis is generally diagnosed clinically, with the healthcare professional considering the symptoms and examination findings while ruling out other causes of chest pain (Mott et al., 2021).
It is important, however, not to assume that every pain that worsens with breathing is costochondritis.
Several different conditions can produce similar symptoms.
Rib Joint Irritation
The ribs connect to the spine through small joints at the back.
These joints move as the rib cage expands and contracts.
If the joints become stiff or irritated, pain may develop around the upper back and travel toward the side of the chest.
Sometimes, the discomfort is eventually felt underneath the breast.
Twisting, reaching, prolonged sitting, or taking a deep breath may make it more noticeable.
This is one reason a physiotherapist may assess the upper back and rib movement rather than focusing only on the painful spot.
Pain After Persistent Coughing
A persistent cough can place considerable demand on the muscles surrounding the ribs.
Every forceful cough involves rapid contraction of the chest and abdominal muscles.
After repeated coughing, these tissues may become sore or irritated.
The pain can then appear underneath the breast or along the side of the ribs.
Deep breathing, coughing, laughing, and sneezing may continue to reproduce the discomfort.
If the cough itself continues, however, the underlying respiratory problem also needs to be addressed.
Treating the sore muscles alone will not resolve the cause of persistent coughing.
Can Posture Contribute?
Posture can influence how the upper back and rib cage move.
Someone who spends many hours sitting with rounded shoulders may develop stiffness around the upper back.
The chest may then move differently during breathing.
This does not mean that poor posture is always the cause of pain.
However, it can contribute to increased tension around the chest, shoulders, and upper back.
A physiotherapist may therefore assess sitting posture, thoracic mobility, shoulder movement, and breathing mechanics together.
How Does a Physiotherapist Assess It?
The assessment usually begins with questions about when the pain started.
The physiotherapist may ask about recent exercise, lifting, coughing, injury, or changes in daily activity.
They may also ask whether the pain changes when you move your arm or rotate your body.
The therapist may gently assess the ribs and surrounding muscles.
Upper-back movement, shoulder mobility, posture, and breathing may also be examined.
The aim is to understand what movements reproduce the symptoms.
This helps determine whether the presentation appears consistent with a musculoskeletal source or whether further medical assessment is appropriate.
What Treatment May Help?
Treatment depends on the underlying cause.
If the pain follows a mild muscle strain, temporarily reducing the activity that triggered it can give the tissues time to settle.
Complete bed rest is usually unnecessary.
Gentle walking and comfortable everyday movement can help prevent stiffness.
Once the sensitivity decreases, a physiotherapist may introduce gentle mobility exercises for the shoulders, upper back, and rib cage.
Breathing exercises may also be useful when pain has caused someone to adopt a shallow or guarded breathing pattern.
The exercises should remain comfortable.
Sharp or progressively worsening pain should not simply be pushed through.
Heat and Gentle Movement
A warm pack may feel soothing when muscle tension contributes to the discomfort.
Some people may prefer cold after a recent minor strain.
The choice depends on what feels comfortable and whether there has been a recent injury.
Gentle movement is generally preferable to repeatedly keeping the chest completely still.
At the same time, repeatedly taking exaggerated deep breaths just to check whether the pain is still present may irritate a sensitive area.
Allow breathing to remain natural and gradually return to deeper movements as the symptoms settle.
When Should You Seek Medical Help?
Pain that worsens when breathing should not automatically be labelled as muscular.
Problems involving the lungs, heart, blood vessels, or other structures can also produce pain that changes with breathing.
Seek urgent medical attention if the pain is sudden or severe, particularly when it occurs with:
- Shortness of breath
- Fainting or severe dizziness
- Cold sweating
- Coughing up blood
- Sudden chest pressure
- Pain spreading toward the arm, jaw, back, or shoulder
- A very fast or irregular heartbeat
These symptoms need medical assessment rather than physiotherapy treatment alone.
New breast changes should also be evaluated.
A new lump, nipple discharge, skin changes, nipple inversion, or persistent focal breast pain should be discussed with a healthcare professional.
Breast pain has many possible causes, and the appropriate investigation depends on factors such as age, symptoms, and clinical examination (Expert Panel on Breast Imaging, 2017).
Myth vs Fact
Myth: Pain under the breast when breathing always comes from the breast.
Fact: The ribs, intercostal muscles, chest muscles, cartilage, and rib joints can also produce pain in this area.
Myth: If deep breathing causes pain, it must be a lung problem.
Fact: Musculoskeletal chest-wall problems can also become painful when the rib cage expands during breathing, although other causes must be ruled out when symptoms are concerning.
Lesser-Known Fact: Breathing Uses Chest Muscles
Many people think breathing is controlled almost entirely by the diaphragm.
The reality is more complex.
The intercostal muscles help move the ribs, while additional muscles around the neck and chest can become more active when breathing becomes deeper or more demanding.
This is one reason why repeated coughing or intense physical activity can leave the chest wall feeling sore.
It also explains why a small irritated area around the ribs can become noticeable with every breath.
Can This Pain Be Prevented?
Suddenly increasing exercise intensity is one way to overload the muscles around the chest.
If you are returning to strength training, increase resistance and repetitions gradually.
Allow adequate recovery between demanding upper-body sessions.
During desk work, changing positions regularly can also help reduce prolonged stiffness around the upper back.
If you frequently carry a child, handbag, or heavy work bag, changing positions and distributing the load can reduce repetitive stress.
Regular movement can also help maintain comfortable mobility of the upper back and rib cage.
Final Thoughts
Pain under the breast when breathing can sometimes be related to the muscles, ribs, cartilage, or joints of the chest wall.
Paying attention to when the pain appears and what movements affect it can provide useful clues about its source.
However, new, severe, or unexplained pain with breathing should not be self-diagnosed. If warning signs are present, seek medical assessment promptly.
Conclusion
Pain under the breast when breathing can sometimes originate from the structures surrounding the breast rather than the breast tissue itself.
Intercostal muscle strain, chest muscle irritation, costochondritis, rib joint irritation, and pain following persistent coughing are possible musculoskeletal causes.
The way the pain behaves can provide useful clues.
Pain that changes with movement, pressing over the area, stretching, or certain positions may suggest a musculoskeletal contribution.
However, these features alone cannot confirm the diagnosis.
A physiotherapist can assess the ribs, upper back, shoulders, breathing pattern, and surrounding muscles to identify movement-related contributors.
If the pain is severe, sudden, unexplained, persistent, or accompanied by breathing difficulty, medical assessment should come first.
For conditions such as costochondritis, treatment commonly focuses on symptom management and addressing contributing factors while more serious causes of chest pain are excluded (Schumann et al., 2024).
Frequently Asked Questions
Why does it hurt under my breast when I take a deep breath?
Irritated intercostal muscles, chest muscles, rib joints, or cartilage can become painful as the rib cage expands during a deep breath. Other causes are also possible, so persistent or concerning symptoms should be assessed.
Can a pulled muscle cause pain under the breast?
Yes. Intercostal and chest muscles can become strained after exercise, lifting, twisting, or repeated coughing. The pain may be felt around or underneath the breast.
Can costochondritis hurt when breathing?
Yes. Costochondritis can cause chest-wall pain that becomes more noticeable with deep breathing, coughing, sneezing, or certain movements.
Can poor posture cause pain under the breast?
Poor posture can contribute to stiffness and increased muscular tension around the upper back and chest. It may be one contributing factor rather than the only cause.
When should I worry about pain under the breast when breathing?
Sudden or severe pain, shortness of breath, fainting, coughing up blood, cold sweating, or pain spreading to the arm, jaw, back, or shoulder requires prompt medical attention.
Can physiotherapy help musculoskeletal rib pain?
A physiotherapist can assess rib and upper-back movement, posture, breathing mechanics, and surrounding muscles. Treatment may include appropriate mobility exercises and gradual return to activity when a musculoskeletal cause has been established.
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Medical Disclaimer
This article is intended for general educational purposes only and should not be considered a substitute for professional medical advice, diagnosis, or treatment. Pain under the breast when breathing can have several possible causes. If symptoms are severe, sudden, persistent, unexplained, or associated with difficulty breathing or other warning signs, consult a qualified healthcare professional promptly.
