Pain on the left side of the body can have many causes, and the location alone isn’t enough to identify the problem. It matters whether the pain is in the chest, upper abdomen, lower abdomen, back, arm, or leg, and what other symptoms occur.
Possible causes
❤️ Left chest: heart problems, including a heart attack, but also muscle/rib inflammation, reflux, or lung problems.
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Cleveland Clinic
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🫁 Chest/back: lung conditions or inflammation can cause pain, sometimes with breathing difficulty.
🥘 Upper-left abdomen: stomach problems, pancreatitis, spleen problems, kidney stones/infection, constipation, or bowel inflammation are among the possibilities.
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Cleveland Clinic
🚽 Lower-left abdomen: constipation, diverticular disease/diverticulitis, urinary problems, and—depending on sex—gynecological conditions can cause pain.
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Cleveland Clinic
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💪 Muscles/ribs: strain or inflammation such as costochondritis can cause localized left-sided pain and may worsen with movement or deep breathing.
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Mayo Clinic
🧠 Left-sided weakness or numbness: sudden weakness/numbness of the face, arm or leg—especially on one side—can indicate a stroke.
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Mayo Clinic
🚨 When it’s an emergency
Get emergency medical help immediately for new or unexplained chest pain, particularly if it lasts more than a few minutes or occurs with shortness of breath, sweating, nausea, dizziness, or pain spreading to the arm, jaw, back or neck.
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Mayo Clinic
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Likewise, sudden one-sided weakness, facial drooping, trouble speaking, sudden vision problems, or loss of balance should be treated as a possible stroke emergency.
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Mayo Clinic
For abdominal pain, severe or worsening pain, fever, persistent vomiting, blood in the stool/urine, jaundice, or inability to pass stool or gas warrants prompt medical assessment.
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Cleveland Clinic
If you tell me exactly where on the left side it hurts (chest, upper/lower abdomen, back, arm or leg), your age, and whether the pain is sharp, dull, burning, or cramping, I can narrow down the possibilities.
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