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The left lumbar region, the area on the left side of the umbilicus, contains various organs. Some of the most important organs located in the left lumbar region are:

  • Small intestine

  • Descending colon of the large intestine

  • Left kidney

A disorder in any of these organs can be the cause of pain in this region. The disorders that cause irritation or pain in the left abdomen are usually related to problems in the left kidney.

Hydronephrosis is a very common disorder of the kidney that causes on & off pain in the left abdomen.

The accumulation of the urine in the kidney is called hydronephrosis. It is caused by the obstruction of the ureter. Due to the obstruction, the urine starts to accumulate within the kidney, causing it to swell. It is known to cause mild to moderate pain in the left lumbar region which may radiate to the back.

Gastrointestinal tract disorders are usually known to cause pain that is associated with food intake. Most of the time, pain due to GI disorders is in the "on & off" form. It may spontaneously develop and fade away.

The most common GIT disorder that can cause pain in the left abdomen is gastroenteritis. This is an inflammation of the internal lining of the stomach and small intestine, and the condition is also known as stomach flu.

It may be caused by bacteria, a virus, or a parasite. Common symptoms of gastroenteritis include vomiting and abdominal pain which may be felt more on the left side. Gastroenteritis caused by a virus usually leads to abdominal pain that comes and goes with time. The symptoms in this case are less likely to be severe. It may develop and resolve spontaneously within a week or two. Bacterial gastroenteritis causes moderate to severe symptoms such as severe pain and blood in stools.

Delayed gastric emptying or constipation is also known to cause generalized pain in the abdominal region. But if the excretory material is stuck in the descending colon of the large intestine, it particularly causes pain in the left lumbar region. It is very common in communities which prefer fast food. A Low fiber diet and insufficient fluid intake is also known to cause constipation. This condition can easily be treated with more fluid intake, a high-fiber diet, and daily exercise.

Some inflammatory conditions such as ulcerative colitis and Crohn's disease may also be the cause of pain in the left lumbar region. It is better to see your doctor and get yourself checked properly. This is because pain in the left lumbar region is not very common. It may be a sign of a severe condition that is not causing severe symptoms.

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