The left side of the human body is home to many organs like the left kidney, left ovary and adrenal gland, the stomach, spleen, heart, and the Sigmoid colon. Part of the large intestine and the pancreas are also located on the left side of the body, according to MedGuidance.
Any one of these organs can cause pain on the left side of the body in the event of an illness.
Since the stomach is on the left side of the body, food poisoning and constipation can create pain on the left side. Kidney stones can cause severe pain on the left side when the left kidney is affected. MedGuidance states that a hernia is a perforation of the stomach wall that can lead to pain in the lower left abdomen.
Other things on the left side that can go wrong and cause pain include an aortic aneurysm, which presents itself as a severe pain in the lower left abdomen. Ovarian cysts often spread from one side of the body into other parts and can affect both the left or right ovaries.
With all the organs on the left side of the body, any severe pain on the left side should be checked out by a medical professional as soon as possible.