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Published on: 8/20/2026
What could be the underlying issues if I experience problems only on the left side of my body?
One-sided body symptoms can stem from several causes, including neurological issues (such as a stroke or nerve compression), heart-related pain, kidney problems, or less common conditions affecting organs on one side of the body.
Common causes of symptoms on one side of the body include:
- Neurological conditions: Stroke, pinched nerves, or multiple sclerosis
- Cardiovascular issues: Referred pain from the heart, often felt on the left side
- Kidney problems: Infections or stones affecting one kidney
- Musculoskeletal strain: Injury or inflammation localized to one side
- Organ-specific conditions: Issues with the liver, spleen, or ovaries
Because one-sided symptoms can range from minor strains to medical emergencies like stroke, identifying the cause quickly matters. The fastest way to narrow down possibilities based on your specific symptoms is to take a free, instant, online symptom check. In just a few minutes, you can get personalized insights into what may be causing your symptoms and clear guidance on your next steps—so you can act with confidence rather than guesswork.
Reviewed for medical accuracy: 07/15/2026
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Explanation
When you experience symptoms only on one side, several underlying issues may be responsible. One possibility is a neurological event, like a stroke, that affects one side of the brain and leads to weakness or numbness only on one side.
Another potential cause is a heart issue. The heart is mostly on the left side of your body, so problems such as angina or a heart attack can lead to pain or discomfort there. One-sided flank pain might not always be caused by kidney stones; sometimes other kidney or vascular issues are at play.
In addition, problems in the upper abdomen on the left side could be due to conditions affecting organs like the spleen or stomach, though these are less common. Because these issues can be serious, it's important to get a thorough medical evaluation. To help understand what might be causing your symptoms, you can start by taking a free symptom checker test that can provide initial insights before seeing a healthcare provider. A medical professional will ask about your symptoms, perform a physical exam, and may order blood tests or imaging studies to determine the exact cause and guide treatment.
(References)
Schneider R, Gautier JC. Leg weakness due to stroke. Site of lesions, weakness patterns and causes. Brain. 1994 Apr;117 ( Pt 2):347-54. doi: 10.1093/brain/117.2.347. PMID: 8186960.
Foreman RD, Garrett KM, Blair RW. Mechanisms of cardiac pain. Compr Physiol. 2015 Apr;5(2):929-60. doi: 10.1002/cphy.c140032. PMID: 25880519.
Feit L, John D, Delgado Torres N, Sinert R. Flank pain and hematuria is not always a kidney stone. Am J Emerg Med. 2021 Feb;40:225.e1-225.e2. doi: 10.1016/j.ajem.2020.07.046. Epub 2020 Jul 24. PMID: 32958382.
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