An abdominal mass happens when something inside your belly, such as an organ, a pocket of fluid or stool, or a growth, gets large enough to feel through the abdominal wall.
The likely reason shifts with where the lump sits, how quickly it appeared, and your age and medical history. Simple causes are common: a colon loaded with stool, a full bladder, or trapped gas can all create a firm area that comes and goes. Other causes include an enlarged liver or spleen, uterine fibroids, an ovarian cyst, a hernia bulging through weak abdominal muscle, an aortic aneurysm, or a tumor. Staying regular with fiber and fluids, treating constipation early, and keeping up with recommended screenings such as colorectal cancer screening remove some causes and catch others sooner. Any new lump you can feel in your belly should be examined by a clinician rather than watched at home.
Why belly masses form
Common questions
Why does Abdominal mass happen?
An abdominal mass is a lump or swelling that can be felt in the belly, and it forms when something inside grows, fills, blocks, or pushes outward. Common reasons include stool backed up in the colon, a full bladder, gas or fluid buildup, an enlarged liver or spleen, uterine fibroids, an ovarian cyst, a hernia pushing through the abdominal wall, an aortic aneurysm, or a tumor. Where the lump sits, how fast it appeared, whether it moves or pulses, and other signs such as weight loss, fever, vomiting, or bleeding all help narrow the cause. A new abdominal mass needs a physical exam and usually imaging such as ultrasound or CT to identify the source.