
Pain under the left breast can be unsettling and may signal something serious. While the pain can be caused by something minor, such as muscle strain, it could also be a symptom of a more concerning condition. It's important to understand what's happening in your body and when to seek medical attention. The pain can be related to multiple organs or body systems, usually in the upper left side of the body, such as the stomach, heart, lungs, pancreas, and spleen.
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What You'll Learn

Muscle strain from intense physical activity
Pain under the left breast can be caused by a variety of factors, including muscle strain, infection, or hormone changes. Several internal organs can also cause pain that radiates to the left breast, including the heart, lungs, stomach, and pancreas. Intense physical activity can lead to muscle strain, which is a common cause of pain under the left breast.
Muscle strain, or a "pulled muscle", occurs when the muscle fibres are stretched beyond their normal limit, resulting in a partial or complete tear of the muscle or tendon. This can happen during intense physical activity, such as heavy lifting, sports, or explosive movements like sprinting or cutting. The chest muscles, in particular, can be strained from activities such as throwing, heavy lifting, or using heavy tools or equipment.
Risk factors that contribute to muscle strain include muscle stiffness, imbalances, and previous injuries. When muscles are tight and inflexible, the fibres are more prone to breaking. Similarly, favouring certain muscles can cause others to become weak and more susceptible to injury. Recurrent muscle tears are common in muscles that have been torn before.
The symptoms of a muscle strain include pain, bruising, swelling, and tenderness. In more severe cases, there may be a complete rupture of the muscle, resulting in significant pain and loss of function. A “pop” may be heard or felt at the moment of injury.
To treat a muscle strain, it is important to rest the affected area and avoid activities that cause pain. Over-the-counter pain relievers and cold compresses can help reduce discomfort. In some cases, a healthcare provider may recommend specific exercises, platelet-rich plasma injections, or surgery for severe tears.
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Heart-related issues, such as angina or heart attack
Pain under the left breast can be a symptom of a heart-related issue. While muscle strain is a possible cause, it is important to consider other potential causes, such as heart-related issues, including angina, heart attack, or pericarditis.
Angina is a symptom of reduced blood flow to the heart, which can be caused by plaque buildup or a blockage in the coronary arteries. It is characterized by chest pain or discomfort that comes and goes and may feel like pressure, tightness, or squeezing in the chest. Angina can be a warning sign of an impending heart attack, so it is crucial to seek medical care if you experience these symptoms.
A heart attack occurs when the blood supply to the heart is blocked, often due to a blockage in a nearby artery. Pain under the left breast can be an indication of a heart problem, as the heart is located slightly to the left of the midline in the upper body. If you suspect you are experiencing a heart attack, it is essential to call emergency services immediately.
Pericarditis is another potential cause of pain under the left breast. It is an inflammation of the pericardium, the protective tissue surrounding the heart muscle. Pericarditis can cause sudden, sharp chest pain that worsens when lying down or breathing deeply. While it may feel like a heart attack, it is not life-threatening. However, it is important to seek medical attention to treat the underlying cause of the inflammation.
While muscle strain can be a cause of pain under the left breast, it is important to consider the possibility of heart-related issues. If you are experiencing any chest pain or discomfort, it is always advisable to seek medical attention to ensure proper diagnosis and treatment.
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Digestive issues, including acid reflux and gastritis
Pain under the left breast can be caused by a variety of factors, including muscle strain, infection, hormone changes, and issues with internal organs such as the heart, lungs, stomach, and pancreas. The pain may also be related to the breast itself or other nearby structures, making it difficult to pinpoint the exact source.
Gastritis, an inflammation of the stomach lining, can also cause a sharp, stabbing, or burning pain under the left breast. The treatment for gastritis depends on its underlying cause and whether it is acute or chronic. Pancreatitis, or inflammation of the pancreas, can also lead to sudden and severe pain under the left breast, requiring pain management or, in some cases, surgery.
Additionally, hiatal hernias occur when part of the stomach pushes through the diaphragm and into the chest cavity, causing digestive acid to reflux into the esophagus. This can result in pain in the upper left portion of the body, radiating to the breast area. Hiatal hernias may increase the risk of gastroesophageal reflux disease (GERD) and can cause symptoms such as heartburn, shortness of breath, a feeling of fullness after eating, and, in more severe cases, vomiting blood and black stools.
It is important to note that pain under the left breast can sometimes indicate a serious condition, such as a heart attack, pulmonary embolism, or cancer. Therefore, it is always advisable to consult a healthcare provider for a thorough evaluation before concluding that the pain is related to muscle strain or digestive issues.
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Inflammation of the pleura, known as pleurisy
Pain under the left breast can be caused by a variety of factors, one of which is a muscle strain. Other causes include infection, hormonal changes, and issues with internal organs such as the heart, lungs, stomach, or pancreas. It is important to consult a healthcare provider to determine the exact cause of the pain.
Now, let's focus on inflammation of the pleura, known as pleurisy:
Pleurisy is a condition that occurs when the pleura, a thin layer of tissue lining the lungs and the inside of the chest cavity, becomes inflamed. This inflammation causes the two layers of the pleura to rub painfully against each other during breathing, resulting in sharp and stabbing chest pains. The pain may remain localized or spread to the shoulder or back. It is typically worse when breathing deeply, coughing, or sneezing.
Infections, such as pneumonia, viral or bacterial illnesses, autoimmune diseases, and lung conditions, are common causes of pleurisy. It can also be caused by blockages or damage to the lungs, such as tumours. To diagnose pleurisy, healthcare providers will consider medical history, perform physical examinations, and conduct diagnostic tests like chest X-rays, CT scans, ultrasounds, and blood tests.
Treatment for pleurisy depends on the underlying cause. Medications such as antibiotics, antifungal drugs, non-steroidal anti-inflammatory drugs (NSAIDs), or corticosteroids may be prescribed to manage pain and treat infections. In some cases, fluid drainage procedures may be necessary to relieve pain and improve breathing.
While chest pain can have various causes, it is important to seek medical attention if you experience sharp or persistent pain under the left breast, as it could indicate a more serious condition.
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Pregnancy, due to pressure from the growing uterus
Pregnancy can cause pain under the left breast due to pressure from the growing uterus. As the baby grows, the internal organs are pushed and moved, and the rib cage may change position. This can cause pain under the breasts as the muscles and tissues stretch. The pain may be worse when leaning forward.
Pregnancy can also cause breast soreness due to hormonal changes. Breast tenderness is often one of the earliest signs of pregnancy, appearing as early as one to two weeks after conception. It is common for breasts to remain sore during the first trimester as hormone production increases. This is due to a rise in estrogen and progesterone, which cause the breasts to swell and become tender.
To help alleviate sore breasts during pregnancy, applying a cold compress, wearing loose clothing, and wearing a well-fitted bra for extra support are recommended.
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Frequently asked questions
Yes, muscle strain is a common cause of pain under the left breast. This type of pain often occurs after intense physical activity or awkward movements, leading to discomfort that can linger for days.
Pain under the left breast can be caused by a variety of factors, including heart-related issues, digestive problems, and breast-related causes. It can also be caused by conditions affecting the internal organs, such as the heart, lungs, stomach, or pancreas.
It is recommended to seek immediate medical attention if you experience severe chest pain, pain that accompanies breathing difficulties, or symptoms such as chest tightness, radiating pain, or shortness of breath.
Home remedies such as rest, over-the-counter pain relievers, and applying a cold compress to the affected area may help reduce discomfort. However, if the pain persists or worsens, it is advisable to consult a healthcare provider.
Yes, during pregnancy, pain under the left breast may be caused by pressure from the growing uterus or the movement of the baby. The muscles and tissues stretch as the baby grows, which can also contribute to the pain.











































