A headline like “Left Side Body Pain: What It Could Mean and When to Pay Attention” is too broad to point to a single cause. Pain on the left side of the body can come from muscles, bones, nerves, or internal organs, and the significance depends on where the pain is, how severe it is, and what other symptoms you have.
Here are some common possibilities by location:
Left side of the chest
Possible causes:
- Muscle strain
- Acid reflux
- Inflammation of the rib cartilage (costochondritis)
- Heart-related problems, such as angina or a heart attack
Seek emergency care immediately if chest pain is accompanied by:
- Pressure, tightness, or heaviness
- Pain spreading to the arm, jaw, neck, or back
- Shortness of breath
- Sweating, nausea, or fainting
Left upper abdomen
Possible causes:
- Gas or constipation
- Stomach ulcer or gastritis
- Problems involving the spleen
- Pancreatitis
- Kidney stones or a kidney infection (which may also cause back pain)
Left lower abdomen
Possible causes:
- Constipation
- Diverticulitis
- Kidney stone
- In women: ovarian cysts, ovarian torsion, or ectopic pregnancy
- Inflammatory bowel disease
Left side of the back or flank
Possible causes:
- Muscle strain
- Kidney stones
- Kidney infection
- Pinched nerve
Left arm or leg
Possible causes:
- Muscle or tendon injury
- Nerve compression
- Arthritis
- Poor circulation
Sudden weakness or numbness affecting one side of the body, especially with difficulty speaking or facial drooping, requires emergency medical attention because it could be a stroke.
When to seek prompt medical attention
You should be evaluated promptly if left-sided pain:
- Is severe or comes on suddenly.
- Persists or keeps getting worse.
- Is accompanied by fever, vomiting, blood in the stool or urine, or unexplained weight loss.
- Occurs with chest pain, shortness of breath, or fainting.
- Follows a significant injury.
If you’re asking because you are experiencing left-sided pain, tell me:
- Where exactly is the pain? (Chest, upper abdomen, lower abdomen, back, arm, or leg?)
- When did it start?
- How would you describe it? (Sharp, dull, cramping, burning, constant, or intermittent?)
- Do you have any other symptoms?
Those details can help narrow down the possible causes.
