What Is the Chest (Thorax)? Anatomy, Function, Conditions and Care
Updated: 2 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026
Quick Answer
The chest, or thorax, is the body region between the neck and abdomen, extending down to the diaphragm. It consists of the sternum, 12 thoracic vertebrae, 12 pairs of ribs, cartilage and muscles, and it protects the heart and lungs while acting as a respiratory pump. Conditions can affect the chest wall, such as fractures, or the organs inside. [1]
What the research says
The upper and lower chest move in different ways when you breathe. Researchers used CT scans of 20 healthy adults at full breath-in and full breath-out. The chest above the sixth rib expanded front to back, while the chest below it widened side to side, and the lower part changed size significantly more than the upper part. The authors conclude that the lower chest has a strong impact on how well you breathe (Bastir et al., Anatomical Record, 2017). [2]
A flail chest signals a more severe rib injury. A meta-analysis of 66 cohorts found that people with flail rib fractures, compared with people who had multiple simple rib fractures, had a higher injury severity score (mean 27 vs 20), more broken ribs (mean 7 vs 4), more lung bruising (73% vs 42%), more blood in the chest cavity (45% vs 20%), and higher in-hospital death (10% vs 2%) (Luttjeboer et al., European Journal of Trauma and Emergency Surgery, 2025). [7]
Heart ultrasound can help in the emergency room, but it is not perfect. A meta-analysis of 29 studies with 5,043 emergency department patients found that cardiac ultrasound picked up acute heart-muscle ischemia in about 79% of patients who had it (sensitivity 79.3%) and correctly cleared about 87% of those who did not (specificity 87.3%). The authors rate the certainty of the evidence as very low and advise reading the pooled results cautiously (Zarama et al., Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine, 2024). [11]
Surgery to stabilize multiple broken ribs shortened ventilator time and lowered pneumonia risk, but the evidence is weak. A meta-analysis of 9 randomized trials (862 patients) found that stabilizing rib fractures with surgery, compared with non-operative care, lowered the risk of pneumonia (relative risk 0.57; 95% CI 0.35 to 0.92) and shortened mechanical ventilation (mean difference -4.62 days) and ICU stay (mean difference -3.05 days). Death from any cause was not significantly different (RR 0.53; 95% CI 0.21 to 1.38), and the authors rated the certainty of the evidence as very low to low (Hisamune et al., World J Emerg Surg, 2024) [13].
Chest wall pain is common, but chest pain still needs to be checked for heart problems. A clinical review notes that roughly 1% of primary care office visits are for chest pain, and 2% to 4% of those patients turn out to have unstable angina or a heart attack. When suspicion for a heart cause is low, clinicians consider other diagnoses such as chest wall pain or costochondritis (McConaghy et al., Am Fam Physician, 2020) [14].
Whether correcting a sunken chest (pectus excavatum) improves fitness is still debated. A meta-analysis of 15 non-randomized studies found no statistically or clinically significant improvement in peak oxygen uptake after surgical correction, and all of the studies had serious or critical risk of bias (Media et al., Sci Rep, 2025) [15]. A separate systematic review of 51 articles reported that 12 of 16 exercise-testing studies showed significant improvement after surgery and that 16 of 17 quality-of-life studies showed improvement, although most studies were small and the data varied (Walsh et al., BMJ Open Respir Res, 2023) [16].
Key Takeaways
Your chest (thorax) is the region between your neck and abdomen, ending at the diaphragm. [1]
It is built from the sternum, 12 thoracic vertebrae, 12 pairs of ribs, cartilage, muscles, fascia, and skin. [1]
The thorax protects your heart and lungs and works as a respiratory pump for breathing. [1]
"Thorax" comes from an ancient Greek word for a type of upper-body armor. [1]
The upper chest lifts front-to-back (pump-handle motion) while lower ribs widen side-to-side (bucket-handle motion) during breathing. [1]
Chest symptoms can signal conditions in the chest wall, inside the chest, or even elsewhere. Emergencies like a heart attack require immediate care. [1]
What Is the Chest (Thorax)?
Your chest (thorax) is the region between your neck and abdomen. It extends from the thoracic inlet at the base of your neck down to your diaphragm, the muscle that separates your chest from your belly. [1]
Your chest gets its name because of its similarity to another use for that word. Just like the treasure chests from storybooks, your chest has valuable contents: some of the most important organs in your body. [1]
The medical term for your chest, thorax, comes from an ancient Greek word for a type of armor worn on the upper body. And like armor, your thoracic cage (the medical name for your ribcage) protects what is inside your chest. [1]
Your chest is a bony cage with critical organs like your heart and lungs inside, with an outer covering of muscles and skin. It has layer upon layer of protection and separation to keep critical organs safe. [1]
Why Is It Called the Thorax?
The word "thorax" comes from an ancient Greek word for a type of armor worn on the upper body. Your thoracic cage, or ribcage, acts like that armor, protecting the heart and lungs inside. [1]
Term | Meaning |
Chest | The everyday word for the region between the neck and abdomen, named like a treasure chest for its valuable contents |
Thorax | The medical term, from an ancient Greek word for upper-body armor |
Thoracic cage | The medical name for the ribcage, which protects the organs inside |
Thoracic inlet | The opening at the base of the neck where the chest begins |
Diaphragm | The muscle that marks the lower boundary of the chest, separating it from the belly |
Function: What Does Your Chest Do?
Your chest has several distinct jobs. It holds and protects vital organs, and it has a variable internal volume, meaning the space inside can expand and shrink, which you need for breathing. It provides a solid structure for your upper body while remaining flexible enough to bend and twist. Your chest supports your head and neck, anchors your arms, and works as a respiratory pump to move air in and out of your lungs. [1]
Function | What It Means for You |
Protects vital organs | The bony cage shields your heart, lungs, and other critical structures |
Variable internal volume | The space inside expands and shrinks, which you need for breathing |
Structural support | Solid structure for your upper body that still bends and twists |
Supports head and neck | Keeps your head and neck supported |
Anchors arms | Your arms anchor to your chest |
Respiratory pump | Moves air in and out of your lungs |
How Your Chest Helps You Breathe
When your diaphragm and intercostal muscles contract, they expand your chest cavity and draw air into your lungs. The upper chest primarily lifts front-to-back in what is called pump-handle motion, while your lower ribs widen side-to-side in bucket-handle motion. Together, these volume and pressure changes move air in and out. [1]
Anatomy: What Are the Parts of the Chest?
Your chest consists of your entire thorax, front and back, including the following structures:
Part | Role |
Sternum | The breastbone at the front center of the chest |
12 thoracic vertebrae | The spine segments in the chest region |
12 pairs of ribs | The bones forming the protective cage |
Muscles | For breathing, movement, and anchoring |
Cartilage between ribs | Flexible connectors joining the ribs to the breastbone |
Fascia and skin | The outer protective covering |
Thoracic cavity | The internal space holding your organs |
Diaphragm | The muscle separating the chest from the belly |
Organs that are not inside the chest but are at least partially protected by it include your kidney, liver, spleen, and stomach. [1]
What Are the Muscles of the Chest?
There are several major skeletal muscle groups in or connected to your chest. Some are for breathing, some are for moving the trunk of your body, and others anchor to your chest but are mainly for moving your arms or neck. [1]
For breathing, your diaphragm is not the only muscle you use. Rib cage and neck muscles can help lift and lower your ribs, abdominal muscles help you push air out forcefully, and some muscles in your back may help too. [1]
For movement and anchoring, muscles in your chest anchor and support your shoulder and arm movement. They can also hold bones stable or lift bones like your shoulder blades when you extend your arm forward. [1]
Muscle Group | What It Does |
Breathing muscles | Diaphragm, rib cage, and neck muscles lift and lower the ribs; abdominal muscles help push air out; some back muscles help too |
Movement and anchoring muscles | Anchor and support shoulder and arm movement; hold bones stable or lift the shoulder blades when extending the arm forward |
Conditions and Disorders
What Conditions Affect the Chest?
Many conditions can affect your chest, and even more can affect the organs and structures inside it. Conditions are often grouped by whether they affect the chest wall itself or what is inside the chest. [1]
Conditions affecting the chest structure (chest wall):
Condition | What It Involves |
Bruises | Bruises to your muscles or bones |
Pectus carinatum | A condition affecting chest structure |
Pectus excavatum | A condition affecting chest structure |
Inflammation of the cartilage connecting ribs | |
Fractured ribs and bone fractures | Including your clavicle. See our guide to rib fractures |
Flail chest | A serious chest wall injury |
Muscle strains | Strained chest muscles |
Skin conditions | Conditions of the chest skin |
Spine conditions | Such as scoliosis or pinched nerves |
Tumors | Benign or malignant, including skin cancer, chest wall tumors, or breast cancer |
Conditions affecting what is inside your chest:
Condition | What It Involves |
Paralysis | Certain types, like paraplegia or quadriplegia |
Mediastinitis | Affects the layers or linings between spaces |
Affects the layers or linings between spaces | |
Esophageal disorders | Digestive issues like gastroesophageal reflux disease (GERD) |
Heart disease | Including structural heart conditions |
Lung conditions | Like a collapsed lung (pneumothorax) or pneumonia |
Thymus conditions | Including cancers like thymomas, or the autoimmune form of myasthenia gravis |
Tracheal diseases | Like tracheal stenosis |
Thoracic outlet syndrome (TOS) | Affects nerves and blood vessels passing through the chest |
Shingles | Herpes zoster |
What Symptoms Suggest a Chest Problem?
Many signs and symptoms can indicate a chest condition. Symptoms specific to your chest wall include musculoskeletal chest pain, visible skin changes like a rash or hives, and visible injuries like bruises or wounds. [1]
Symptoms that can indicate an issue inside your chest include changes in how your chest looks when you breathe (such as intercostal retractions), chest pain, pressure or other sensations, heartburn, shortness of breath (dyspnea) or other breathing difficulties, and nerve-related symptoms like tingling or numbness in part of your chest. [1]
Some conditions can cause chest-related symptoms without directly affecting your chest. For example, chest tightness or rapid breathing can result from anxiety or panic attacks. [1]
Symptom Location | Possible Signs |
Chest wall itself | Musculoskeletal chest pain, visible skin changes (rash or hives), visible injuries (bruises or wounds) |
Inside the chest | Changes in chest appearance when breathing (intercostal retractions), chest pain or pressure, heartburn, shortness of breath, tingling or numbness |
Not directly chest-related | Chest tightness or rapid breathing from anxiety or panic attacks |
When to seek emergency care: Many symptoms that affect your chest are possible, and some happen with life-threatening conditions. If you think you might have symptoms of a medical emergency like a heart attack or pulmonary embolism, you need medical care right away. Call 911 (or your local emergency services number) immediately. If you are concerned about symptoms you are experiencing, talk to a healthcare provider. [1]
Common Tests to Check Your Chest
There are many ways that providers can check for conditions affecting the inside of your chest. Some are simpler, like a provider doing a physical exam and using a stethoscope to listen to your breathing and heartbeat. Depending on your symptoms, tests may include the following:
Test | What It Checks |
Physical exam with stethoscope | Listening to your breathing and heartbeat |
Electrocardiogram (ECG or EKG) | Heart electrical activity |
Blood tests (such as troponin) | Heart muscle injury |
Chest X-ray | Imaging of the chest |
CT scan | Detailed cross-sectional imaging |
MRI | Detailed imaging using magnetic fields |
Pulmonary function tests (spirometry) | Breathing issues |
Echocardiogram | Ultrasound of the heart |
Stress test | Heart evaluation |
Your healthcare provider can tell you more about the possible or recommended tests for your specific needs and situation. They can also refer you to specialists with more expertise in chest-related conditions, including cardiologists (heart specialists), pulmonologists (lung specialists), and cardiothoracic surgeons. [1]
Prevention and Care
How Can You Take Care of Your Chest?
The chest works without you needing to think about it, but there are practical steps you can take to protect it and catch problems early. Wearing safety equipment like seat belts and helmets helps prevent traumatic chest injuries from accidents and falls. Maintaining good posture reduces strain on the chest wall and spine. Regular exercise strengthens the breathing muscles and supports the flexibility of the ribcage and torso.
Perhaps the most effective habit is preventive care: seeing a primary care provider for annual checkups lets your provider detect many chest-related concerns before you have symptoms.
When Should You See a Healthcare Provider?
If you have a concern about something involving your chest, talk to a healthcare provider. They can look, listen, and run tests to see if there is a cause for concern. Do not forget to see a primary care provider for annual checkups too. During these visits, your provider can detect many chest-related concerns before symptoms appear. [1]
If you think you might have symptoms of a medical emergency like a heart attack or pulmonary embolism, call 911 (or your local emergency services number) immediately.
Conclusion
Your chest is easy to take for granted because it works without you needing to think about it. Yet this region between your neck and abdomen is nothing short of a treasure chest: it holds and protects your heart and lungs, pumps air in and out with every breath, supports your head and neck, and anchors your arms. Built from the sternum, twelve thoracic vertebrae, twelve pairs of ribs, cartilage, muscles, fascia, and skin, the thorax earns its armor-like name by guarding your most vital organs layer upon layer. From bruises and fractures to heart disease and pneumonia, many conditions can affect the chest wall or the organs inside, and modern medicine offers everything from a simple stethoscope exam to echocardiograms and MRI scans to find the cause. Because chest symptoms can sometimes signal life-threatening emergencies, any unexplained chest pain, pressure, or shortness of breath deserves prompt medical attention, and routine checkups can catch many problems before symptoms ever appear.
Frequently Asked Questions
What is the chest (thorax)?
The chest (thorax) is the region of your body between your neck and abdomen, extending from the thoracic inlet at the base of your neck down to your diaphragm.
Where is the thorax located?
Between your neck and abdomen. It starts at the thoracic inlet at the base of your neck and ends at the diaphragm.
What is the thoracic inlet?
The opening at the base of your neck where your chest begins.
What is the diaphragm?
The muscle that separates your chest from your belly. It marks the lower boundary of the chest.
What does "thorax" mean?
The medical term for your chest. It comes from an ancient Greek word for a type of armor worn on the upper body.
Why is the chest compared to armor?
Because your thoracic cage (ribcage) protects the organs inside your chest, much like armor protects the body.
Why is the chest compared to a treasure chest?
Just like the treasure chests from storybooks, your chest has valuable contents: some of the most important organs in your body.
What is the thoracic cage?
The medical name for your ribcage. It protects what is inside your chest.
What organs are inside the chest?
Critical organs like your heart and lungs.
Which organs are partially protected by the chest but not inside it?
Your kidney, liver, spleen, and stomach.
What is the chest made of?
It is a bony cage with an outer covering of muscles and skin, with layer upon layer of protection and separation.
What bones make up the chest?
The sternum, 12 thoracic vertebrae, and 12 pairs of ribs.
How many ribs are there?
Twelve pairs of ribs.
How many thoracic vertebrae are there?
Twelve thoracic vertebrae.
What is the sternum?
The breastbone, one of the parts of the chest.
What is the cartilage in the chest for?
It joins the front ends of your ribs to your breastbone with flexible material, letting your chest move when you breathe.
What is the thoracic cavity?
The internal space of the chest that holds your organs.
What does fascia do in the chest?
Along with skin, fascia forms the outer protective covering of the chest.
What does the chest do?
It holds and protects vital organs, works as a respiratory pump, supports your head and neck, anchors your arms, and provides solid but flexible structure for your upper body.
How does the chest help with breathing?
It has a variable internal volume: the space inside can expand and shrink, which you need for breathing.
What is a respiratory pump?
A way of describing how the chest moves air in and out of your lungs.
What are intercostal muscles?
Muscles between the ribs that contract with the diaphragm to expand the chest cavity and draw air into the lungs.
What is pump-handle motion?
The front-to-back lifting movement of the upper chest during breathing.
What is bucket-handle motion?
The side-to-side widening movement of the lower ribs during breathing.
Is the chest flexible?
Yes. It provides a solid structure for your upper body but is still flexible enough to bend and twist.
Does the chest support my head and neck?
Yes, supporting your head and neck is one of the chest's jobs.
How do my arms attach to my chest?
The chest anchors your arms.
What muscles are involved in breathing?
Your diaphragm, rib cage and neck muscles (which help lift and lower the ribs), abdominal muscles (which help push air out forcefully), and some back muscles.
Is the diaphragm the only muscle used for breathing?
No. Rib cage and neck muscles help lift and lower your ribs, abdominal muscles help push air out forcefully, and some back muscles may help too.
What do the chest muscles do for movement?
They anchor and support your shoulder and arm movement, hold bones stable, and lift bones like your shoulder blades when you extend your arm forward.
What conditions affect the chest wall?
Bruises to muscles or bones, pectus carinatum, pectus excavatum, costochondritis, fractured ribs and other bone fractures (including the clavicle), flail chest, muscle strains, skin conditions, spine conditions like scoliosis or pinched nerves, and tumors.
What is pectus carinatum?
A condition that affects the chest structure.
What is pectus excavatum?
A condition that affects the chest structure.
What is costochondritis?
A condition of the chest, affecting the cartilage of the ribs.
What is flail chest?
A serious condition affecting the chest wall.
Can tumors affect the chest?
Yes, including benign or malignant tumors: surface tumors like skin cancer, or deeper ones like chest wall tumors or breast cancer.
What conditions affect the organs inside the chest?
Certain types of paralysis (paraplegia or quadriplegia), mediastinitis, pleurisy, esophageal disorders or GERD, heart disease or structural heart conditions, lung conditions like collapsed lung (pneumothorax) or pneumonia, thymus conditions including thymomas or the autoimmune form of myasthenia gravis, tracheal diseases like tracheal stenosis, thoracic outlet syndrome, and shingles.
What is GERD?
Gastroesophageal reflux disease, a digestive issue that can affect the esophagus inside the chest.
What is a collapsed lung?
Also called pneumothorax, a lung condition that can affect what is inside your chest.
What is pleurisy?
A condition affecting the layers or linings between spaces inside the chest.
What is mediastinitis?
A condition affecting the layers or linings between spaces inside the chest.
What is a thymoma?
A cancer of the thymus, a condition affecting what is inside the chest.
What is myasthenia gravis?
An autoimmune condition that can have a form affecting the thymus inside the chest.
What is tracheal stenosis?
A tracheal disease that can affect the airway inside the chest.
What is thoracic outlet syndrome?
A condition (TOS) that can affect the chest area.
Can shingles affect the chest?
Yes. Shingles (herpes zoster) is a condition that can affect the chest.
What are symptoms of a chest wall problem?
Musculoskeletal chest pain, visible skin changes like a rash or hives, and visible injuries like bruises or wounds.
What symptoms suggest a problem inside the chest?
Changes in how your chest looks when breathing (intercostal retractions), chest pain, pressure or other sensations, heartburn, shortness of breath (dyspnea) or other breathing difficulties, and nerve-related symptoms like tingling or numbness.
What are intercostal retractions?
A change in how your chest looks when you breathe, one of the signs of an issue inside the chest.
Can anxiety cause chest symptoms?
Yes. Chest tightness or rapid breathing can result from anxiety or panic attacks, even without a chest condition.
When should I call 911 for chest symptoms?
If you think you might have symptoms of a medical emergency like a heart attack or pulmonary embolism, call 911 (or your local emergency services number) immediately.
How do doctors check your chest?
Through a physical exam with a stethoscope, electrocardiogram (ECG/EKG), blood tests such as troponin, chest X-ray, CT scan, MRI, pulmonary function tests (spirometry), echocardiogram (ultrasound of the heart), and stress tests.
What is troponin?
A blood test marker used to check for heart muscle injury.
What is spirometry?
A pulmonary function test used for breathing issues.
What is an echocardiogram?
An ultrasound of the heart.
What chest specialists might my doctor refer me to?
Cardiologists (heart specialists), pulmonologists (lung specialists), and cardiothoracic surgeons.
How can I protect my chest?
Wear seat belts and protective gear to prevent injuries, maintain good posture, exercise regularly to strengthen breathing muscles, and see a primary care provider for annual checkups so concerns can be detected before symptoms appear.
Why are annual checkups important for chest health?
During checkups, your provider can detect many chest-related concerns before you have symptoms.
Related Reading
Chest Pain: Symptoms, Causes & Treatment explains the many causes of chest pain and when to call 911.
The Sternum (Breastbone): Anatomy, Function, and Common Conditions describes the breastbone's structure and the conditions that affect it.
The Diaphragm: Understanding Your Body’s Primary Breathing Muscle explains how the diaphragm powers breathing and what can go wrong.
Pectus Excavatum: What a Sunken Breastbone Means for Your Heart, Lungs, and Confidence covers sunken chest wall shape, its effects and correction options.
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Disclaimer
This article is for informational purposes only and does not constitute medical advice. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.
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