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Addressing Pain Under the Left Breast: Causes and Solutions

Apr 10, 2024 | 7 min read

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Pain under the left breast can stem from various causes, each requiring a unique approach to diagnosis and treatment. This discomfort may be linked to digestive issues like heartburn or gastritis, heart and chest conditions including costochondritis and pericarditis, or even stem from chest injuries or spleen problems. Identifying the precise cause is crucial for effective management, involving a combination of professional medical advice, diagnostic methods, and lifestyle adjustments.

pain under left breast

Common Digestive Causes of Pain Under Left Breast

Digestive causes are among the most common sources of this pain, ranging from mild irritations such as heartburn to more intense conditions like pancreatitis. Understanding these can offer not only peace of mind but also directions toward alleviating your discomfort.


Heartburn is a prevalent issue that causes a burning sensation in the chest, just behind the breastbone, often extending under the left breast. This discomfort typically occurs after eating, lasting from a few minutes to several hours.

Symptoms include:

  • A burning sensation in the chest, often after eating or at night
  • Pain that worsens when bending over or lying down
  • A sour or bitter taste in the mouth

Treatment: Over-the-counter antacids can provide quick relief by neutralizing stomach acid. For more persistent heartburn, medications that reduce acid production or prevent acid reflux into the esophagus may be recommended by your healthcare provider.

Prevention: Lifestyle changes can significantly reduce heartburn occurrences. Eating smaller meals, avoiding late-night snacks, reducing fatty or spicy foods, and maintaining a healthy weight are effective strategies. Elevating the head while sleeping can also prevent acid reflux.


Gastritis, an inflammation of the stomach lining, can cause pain under the left breast due to its proximity to the upper abdomen. Symptoms often include:

  • Nausea or recurrent upset stomach
  • Abdominal bloating and pain
  • Vomiting and indigestion
  • A feeling of fullness in the upper abdomen after eating

After noting these symptoms, it may be beneficial to use an online tool like the Symptom Checker for an initial assessment of your condition. While this tool can provide insights, it's not a substitute for professional medical advice.

Treatment: Treatment focuses on reducing the irritation and inflammation causing the symptoms. This may involve the use of antacids, acid blockers, or antibiotics in cases where an infection is present.

Prevention: Avoiding known irritants such as NSAIDs, alcohol, and spicy foods can help prevent gastritis. Additionally, managing stress and eating a balanced diet can contribute to a healthier stomach lining.

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Pancreatitis is an inflammation of the pancreas that lies behind the stomach and can cause severe pain under the left breast. It can manifest as acute or chronic and may present symptoms such as:

  • Upper abdominal pain that radiates to the back
  • Pain that worsens after eating
  • Nausea and vomiting
  • Fever and rapid pulse in more severe cases

Treatment: Treatment varies based on the condition's severity but generally includes fasting to allow the pancreas to recover, followed by a diet rich in fluids and low in fat. Hospitalization may be necessary for severe cases to manage pain and hydration.

Prevention: Limiting alcohol consumption, maintaining a healthy diet, and managing triglyceride levels can reduce the risk of developing pancreatitis. Regular medical checkups can also help detect and address risk factors early.

While digestive issues are a common source of pain under the left breast, it's also crucial to be aware of heart and chest-related conditions.

Heart Attack

A heart attack, or myocardial infarction (MI), occurs when the blood flow to a part of the heart is blocked for a long enough time that part of the heart muscle is damaged or dies. This is a medical emergency that demands immediate attention. According to the American Heart Association (AHA), approximately every 40 seconds, an American will have an MI, highlighting the urgency and prevalence of this condition. Symptoms can vary but often include:

  • Chest pain or discomfort that may feel like pressure, squeezing, fullness, or pain
  • Pain or discomfort in one or both arms, the back, neck, jaw, or stomach
  • Shortness of breath
  • Nausea, lightheadedness, or cold sweats

Treatment: Immediate treatment is crucial and can include medications to dissolve clots and restore blood flow, surgical procedures like angioplasty, and lifestyle modifications post-recovery.

Prevention: A healthy lifestyle is key to preventing heart attacks. This includes managing blood pressure, cholesterol levels, diabetes, exercising regularly, eating a balanced diet, avoiding tobacco, and managing stress.

Precordial Catch Syndrome

Precordial Catch Syndrome is a benign condition that primarily affects children and young adults, causing a sharp, stabbing pain in the chest. This pain:

  • Is usually brief, lasting a few seconds to minutes
  • Is localized to one area of the chest
  • Does not radiate or spread

Treatment: Generally, no treatment is necessary as the condition is harmless and resolves on its own. Educating the patient about the nature of the syndrome often provides reassurance.

Self-care: Deep breathing, despite the initial increase in pain, can sometimes help resolve the discomfort quicker. Relaxation techniques may also be beneficial.


Pleurisy involves the inflammation of the pleura, the double-layered membrane surrounding the lungs and lining the chest cavity. Symptoms include:

  • Sharp chest pain that worsens with breathing
  • Shortness of breath
  • A dry cough

Treatment: Addressing the underlying cause of pleurisy is key. This may involve antibiotics for bacterial infections or anti-inflammatory medications. Pain relief is also a critical component of treatment.

Self-care: Rest and lying on the painful side may reduce the pressure on the pleura and alleviate pain. Applying heat on the chest can also offer comfort.


Pericarditis is the inflammation of the pericardium, the fluid-filled sac surrounding the heart. Symptoms often involve:

  • Sharp, stabbing chest pain that may radiate to the neck, shoulder, or back
  • Pain that lessens when sitting up and leaning forward
  • Shortness of breath when lying down

Treatment: Treatment aims to reduce inflammation and may include medications like anti-inflammatories or, in some cases, antibiotics. Severe cases might require surgical intervention.

Prevention: Timely treatment of infections and underlying health conditions can help prevent pericarditis. Regular check-ups and monitoring of symptoms associated with pericarditis are advised for those at risk.


Costochondritis is an inflammation of the cartilage that connects a rib to the breastbone (sternum), a condition that can mimic the pain associated with heart attacks. It’s characterized by:

  • Sharp pain at the costosternal junction
  • Pain that worsens with certain movements or deep breathing
  • Tenderness when pressing on the rib joints

Treatment: The primary approach includes rest and avoiding activities that exacerbate the pain. Over-the-counter pain relievers can help manage discomfort. In some cases, physical therapy may be recommended to reduce inflammation and prevent recurrence.

Self-care: Applying heat or ice packs to the affected area can provide relief. Gentle stretching exercises, as advised by a healthcare professional, can also aid recovery.

Other Causes and Conditions

Pain under the left breast can also stem from conditions and causes that, while less common, necessitate consideration and can have significant health implications. These issues may require specific interventions and highlight the importance of a comprehensive medical evaluation for accurate diagnosis and effective treatment.

Chest Injuries

Injuries to the chest area, such as bruises, fractures, or trauma to the ribs and surrounding tissues, can cause pain under the left breast. Symptoms might include:

  • Sharp, localized pain, especially when breathing deeply or moving
  • Swelling or tenderness in the affected area
  • Visible bruising or deformation

Treatment: Rest and ice can help manage minor injuries, but medical evaluation is crucial for severe trauma. Treatment may involve pain management strategies and, for more serious injuries, surgical intervention.

Prevention: Wearing protective gear during sports and activities, practicing safe driving, and fall-prevention measures in the home can reduce the risk of chest injuries.

Hiatal Hernia

A hiatal hernia occurs when part of the stomach protrudes up through the diaphragm into the chest cavity, potentially causing pain under the left breast due to its proximity. Symptoms include:

  • Heartburn, especially after eating or at night
  • Regurgitation of food or liquids into the mouth
  • Difficulty swallowing
  • Chest or abdominal pain

Treatment: Lifestyle changes and medications that reduce stomach acid can manage symptoms, but severe cases may require surgery to repair the hernia.

Prevention: Maintaining a healthy weight, eating smaller meals, avoiding lying down or bending over after meals, and avoiding foods that trigger heartburn can prevent symptoms from worsening.


Identifying the cause of pain under the left breast involves several diagnostic methods, depending on the symptoms and suspected condition. These may include:

  1. Physical Examination: A thorough physical exam to check for any visible signs of injury or abnormality and to understand the nature of the pain.
  2. Blood Tests: To detect or rule out infections, inflammation, and other possible internal causes of pain.
  3. Electrocardiogram (ECG or EKG): Measures electrical signals from the heart to detect heart-related issues.
  4. Endoscopy: A procedure involving a flexible tube with a light and camera to view the digestive tract, useful for diagnosing conditions like gastritis.
  5. Imaging Tests:
  • Chest X-ray: Helps visualize the heart, lungs, and chest wall.
  • Ultrasound: Used for a closer look at the spleen, pancreas, and other abdominal organs.
  • CT Scan or MRI: Provides detailed images of the chest and abdomen, useful for diagnosing injuries and other conditions not seen on an X-ray.

Frequently Asked Questions

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Key Takeaways

Understanding and managing pain under the left breast involves recognizing the potential causes, knowing when to seek medical attention, and following through with recommended diagnostics and treatment. Here are the crucial points to remember:

  • Variety of Causes: Pain under the left breast can be attributed to a few primary conditions, such as heartburn, costochondritis, heart attack, and injuries to the chest or spleen. Each of these causes requires a different approach to diagnosis and treatment.
  • Seek Professional Guidance: Always consult a healthcare professional for an accurate diagnosis and tailored treatment plan.
  • Importance of Diagnostics: Utilize diagnostic tools like blood tests, imaging, and endoscopy to uncover the underlying cause.
  • Treatment and Lifestyle Adjustments Are Key: Adhere to prescribed treatments and consider lifestyle changes to manage and alleviate pain.
  • Monitor Symptoms and Follow-Up: Regularly monitor your symptoms and maintain open communication with your healthcare provider, especially for chronic conditions.
  • Preventive Measures: Engage in preventive measures, including healthy lifestyle choices, to reduce the risk of certain conditions.
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