Pain on the Left Side of the Body: What Could It Mean?
Pain on the left side can come from many different structures, including muscles, nerves, the digestive system, kidneys, lungs, or heart. The location and accompanying symptoms are important, and left-sided pain by itself doesn’t point to one specific diagnosis.
1. Muscle strain
A pulled or overworked muscle can cause localized pain in the left shoulder, back, ribs, side, or abdomen. It may become worse with movement or certain positions.
2. Stomach or digestive problems
Gas, indigestion, gastritis, constipation, or other digestive conditions can cause pain on the left side of the abdomen.
3. Kidney problems
A kidney stone or kidney infection can cause pain toward the left side or back. Urinary symptoms, fever, nausea, or blood in the urine can provide additional clues.
4. Diverticular disease
Pain in the lower-left abdomen, particularly when accompanied by fever or changes in bowel habits, can occur with diverticulitis.
5. Spleen problems
The spleen sits in the upper-left abdomen. An enlarged or injured spleen can cause pain there. Severe left-upper abdominal pain after an injury is an emergency because a ruptured spleen can cause internal bleeding.
6. Nerve or spine problems
A pinched nerve or problem in the spine can cause pain that travels from the back into the side, chest, arm, or leg. The pain may be accompanied by tingling or numbness.
7. Heart-related pain
Left-sided chest, shoulder, arm, back, or even upper-abdominal discomfort can sometimes occur during a heart attack. It may occur with shortness of breath, sweating, nausea, lightheadedness, or a feeling of pressure or squeezing.
When to seek urgent medical care
Get emergency medical help for sudden or severe left-sided pain, particularly if it occurs with:
- Chest pressure or pain
- Difficulty breathing
- Fainting or severe dizziness
- New weakness or numbness
- Confusion or difficulty speaking
- Heavy sweating or nausea
- Blood in vomit, stool, or urine
- A high fever
- Severe pain following an injury
Persistent, recurrent, or unexplained pain should also be evaluated by a healthcare professional.
Important: “Left side” can mean the chest, abdomen, back, arm, or leg, and the possible causes are very different. If you tell me exactly where on the left side the pain is (chest, upper abdomen, lower abdomen, back, arm, or leg), your age, and whether it is sharp, dull, burning, or cramping, I can explain the most likely possibilities.
