Pain on the Left Side of the Body: What It Could Mean



Engaging Introduction

Abdominal pain refers to discomfort or uncomfortable sensations that you feel in your belly area. Just about everybody, at one time or another, will get a bellyache.

Most causes of abdominal pain aren't reasons to worry, and your doctor can easily diagnose and treat the problem. But sometimes, it can signal a serious illness that needs medical attention.

I remember the first time I felt a sharp, stabbing pain on my lower left side. I was at work, and it came out of nowhere. My mind immediately went to the worst-case scenario. Appendicitis? But that's on the right side. Was it my kidney? My colon? Was something seriously wrong?

I spent an hour googling symptoms, which only made me more anxious. Every possible cause seemed either completely benign or terrifyingly serious.

I finally called my doctor. She asked a series of questions: Where exactly is the pain? On a scale of 1-10, how bad is it? Does it come and go? Is it sharp or dull? Any other symptoms?

Based on my answers, she said it was likely gas or a muscle strain. She was right. It resolved on its own within a day.

But that experience taught me that left-side abdominal pain is common, often benign, but sometimes serious. Knowing the difference can save you from unnecessary worry—or from delaying necessary care.

Let me walk you through what left-side abdominal pain could mean, from the harmless to the urgent.

First, What Organs Are on the Left Side of Your Abdomen?

Understanding what's located where can help you interpret your pain.

Upper left abdomen:

  • Stomach

  • Spleen

  • Left kidney and ureter

  • Pancreas (body and tail)

  • Left lobe of the liver (small portion)

  • Left adrenal gland

  • Lower left lung (referred pain)

  • Ribs and muscles

Middle left abdomen (flank):

  • Left kidney and ureter

  • Colon (descending colon)

  • Small intestine

  • Muscles and nerves

Lower left abdomen:

  • Colon (sigmoid colon)

  • Left ovary and fallopian tube (in women)

  • Left ureter

  • Small intestine

  • Pelvic muscles and nerves

Knowing which organ is in which region can help you and your doctor narrow down the cause.

Common Causes of Left-Side Abdominal Pain (Organized by Location)