Question: why do i have a knot on the left side of my stomach?
Answer: In most cases, a lump is caused by a hernia. An abdominal hernia is when the abdominal cavity structures push through a weakness in your abdominal wall muscles. Usually, this can be easily corrected with surgery. In rarer cases, the lump may be an undescended testicle, a harmless hematoma, or a lipoma.