Sternum (breastbone) pain can come from many different problems, ranging from minor and musculoskeletal to serious heart or lung issues.

⚠️ First: when to get urgent help

Get emergency help (ER/911) immediately if sternum or central chest pain comes with any of these:

  • Sudden pressure, tightness, squeezing, or heavy feeling in the chest
  • Pain spreading to arm, jaw, neck, back, or shoulder
  • Shortness of breath or trouble breathing
  • Sweating, nausea, or vomiting
  • Feeling faint, confused, or very weak
  • Fast, irregular heartbeat or palpitations
  • Pain after significant chest trauma (car accident, heavy blow, fall)

Those can signal a heart attack, pulmonary embolism, pneumothorax, aortic dissection, or other life‑threatening causes, and you should not wait this out at home.

Common “everyday” reasons your sternum might hurt

Many cases of sternum pain are musculoskeletal , meaning they come from bones, joints, cartilage, or muscles around the breastbone.

1. Costochondritis (very common cause)

Inflammation of the cartilage where the ribs attach to the sternum.

Typical features:

  • Sharp, aching, or pressure-like pain along one or more rib joints at the sternum
  • Pain worsens when you press on the area, move your chest, lift, twist, cough, or take a deep breath
  • Often follows a respiratory infection, heavy lifting, new exercise, or awkward movement

It can feel scary because it mimics heart pain, but it’s usually benign and treated with rest and anti‑inflammatory medication under medical guidance.

2. Muscle strain or chest wall injury

Overuse or strain of chest muscles or a direct blow can cause sternum area pain.

  • Starts after weightlifting, push‑ups, new workouts, heavy lifting at work, or intense coughing
  • Pain is usually localized and tender to touch
  • Movements of arms, shoulders, or trunk often make it worse

Bruising or minor trauma to the front of the chest can also make the sternum feel sore for days to weeks.

3. Sternum or rib fracture / joint injury

More serious trauma can fracture the sternum or ribs, or injure the sternoclavicular joint (where the collarbone meets the sternum).

  • Strong, sharp pain in the center of the chest, often clearly linked to an accident, fall, or impact
  • Pain with breathing, coughing, laughing, or moving
  • Possible deformity, swelling, or visible bruising

These need medical evaluation, sometimes X‑rays or CT scans, because they can also be associated with injuries to the heart or lungs.

Causes that feel like sternum pain but come from elsewhere

Not all pain “behind the sternum” is from the bone itself. It may be substernal pain from the heart, lungs, or digestive system.

4. Acid reflux / GERD and other GI issues

Digestive conditions commonly cause burning or pressure behind the breastbone.

  • Burning pain behind the sternum, often after eating or when lying down
  • Sour taste in the mouth, regurgitation, chronic cough, or sore throat
  • Sometimes mistaken for heart pain

Other GI causes include hiatal hernia, peptic ulcers, pancreatitis, or esophageal spasm, which can give upper abdominal or lower chest pain near the sternum.

5. Heart and major vessel problems

Some serious heart and vessel issues can present as central or left‑sided chest pain that feels like it’s behind the sternum.

  • Coronary artery disease or heart attack (pressure, heaviness, spreading pain, associated symptoms as above)
  • Myocarditis or pericarditis (inflammation of heart muscle or lining) causing sharp chest pain, often worse when lying down and better sitting forward, sometimes after viral illness
  • Aortic dissection (sudden, severe tearing chest pain radiating to back)

These require urgent medical care; they cannot be safely diagnosed at home.

6. Lung and breathing-related causes

Pain near the sternum can also come from the lungs and surrounding tissues.

  • Pneumonia or bronchitis: chest discomfort, fever, cough, feeling unwell
  • Pleurisy: sharp pain that worsens with deep breaths or coughing
  • Pulmonary embolism: sudden chest pain, shortness of breath, rapid heart rate, sometimes leg swelling
  • Pneumothorax (collapsed lung): sudden sharp chest pain and breathlessness

These conditions need prompt medical evaluation, especially if breathing feels difficult.

7. Anxiety, stress, and panic attacks

Anxiety can cause real chest tightness, pain, and a feeling of pressure in the sternum area.

  • Often accompanied by fast heart rate, rapid breathing, sweating, shaking, or a sense of dread
  • Can come in waves or “attacks”
  • Many people first fear a heart problem, so they seek urgent care

While anxiety is a genuine cause, it should only be blamed after dangerous cardiac and lung causes are ruled out.

8. Less common but important causes

Some rarer but serious conditions can also affect the sternum area.

  • Infections like osteomyelitis (infection of the sternum bone), especially after heart surgery, severe chest trauma, or in people with weakened immune systems
  • Inflammatory diseases (e.g., certain arthritis types, fibromyalgia)
  • Tumors affecting bone, lung, breast, or lymph tissue

Persistent, worsening, or unexplained sternum pain—especially with weight loss, fever, or night sweats—needs evaluation.

What doctors usually ask and check

In clinic or ER, a clinician will try to separate benign chest wall pain from heart, lung, or GI emergencies.

They’ll ask about:

  • Exact location: pinpoint spot vs vague pressure; surface vs deep
  • Onset: sudden vs gradual, linked to exercise, emotion, or trauma
  • Triggers: movement, deep breaths, eating, lying flat, stress
  • Associated symptoms: shortness of breath, palpitations, dizziness, cough, fever, heartburn, swallowing problems

They may then:

  • Press on your chest and ribs to see if the pain is reproducible
  • Check heart and lung sounds
  • Order tests like ECG, blood tests, chest X‑ray, or other imaging depending on the story

This step‑by‑step approach helps narrow down “why does my sternum hurt” from a very long list to a specific diagnosis.

What you can safely do (and what you shouldn’t)

I can’t diagnose you, but these general pointers are often recommended while you seek proper care. Always follow local medical advice.

Possibly reasonable self‑care for mild, non‑red‑flag pain

If your pain is mild, clearly linked to muscle strain, and you have no red‑flag symptoms :

  • Rest from heavy lifting or strenuous upper‑body exercise
  • Use local heat or cold packs on a sore chest wall or muscle (wrapped, not directly on skin)
  • Maintain good posture to avoid extra pressure on the chest
  • Over‑the‑counter pain relievers may be used if you’ve safely taken them before and have no contraindications (only as per package directions, and ideally with medical advice)

If you suspect reflux: small meals, avoiding late‑night eating, elevating the head of the bed, and avoiding trigger foods can sometimes help.

When to see a doctor soon (next hours to days)

Even if it doesn’t feel like an emergency, you should arrange a prompt medical review if:

  1. Pain lasts more than a few days or keeps coming back.
  2. Pain significantly limits breathing, sleeping, or daily activities.
  3. You’ve had recent chest trauma (even if it seemed minor at the time).
  4. You have risk factors (smoking, high blood pressure, diabetes, high cholesterol, strong family history of heart disease).
  5. You notice fever, weight loss, night sweats, or general feeling of being unwell.

Forum style snapshot: what people often describe

“I thought I was having a heart attack because the pain was right in the center of my chest. Turned out to be costochondritis from heavy lifting. Still hurt a lot, but at least it wasn’t my heart.”

“Mine was a burning, almost like fire behind my breastbone after meals. It would get worse when I lay down—doc said it was reflux, not my heart.”

Stories like these are common online, but remember: your situation can be different, and only an in‑person clinician with tests can safely rule things in or out.

Bottom line

  • “Why does my sternum hurt?” has many possible answers: from muscle strain and costochondritis to heart, lung, or digestive conditions.
  • Any chest pain with red‑flag symptoms (breathlessness, spreading pain, sweating, collapse, or severe sudden pain) is an emergency.
  • Even milder, persistent, or unexplained pain should be checked by a health professional rather than self‑diagnosed.

If you tell me more about how your sternum hurts—when it started, what makes it better or worse, and any other symptoms—I can help you think through what to bring up with a doctor, but I’ll still recommend in‑person care for any concerning features. Information gathered from public forums or data available on the internet and portrayed here.