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In brief: Water. Free fluid is typically water. The lining of your abdominal contents are slippery (your bowel, the lining of your organs) and it's thus wet inside your abdomen. It's normal to have a little free fluid in one's pelvis, as that's where fluid tends to pool.
Free fluid in the abdomen, or ascites, is typically caused by cirrhosis, hepatitis B or C, or long-term or chronic alcohol use, according to Healthline. Ascites is most commonly the result of liver scarring, which increases the pressure on the vessels found in the liver, forcing fluid into the abdomen. Keep Learning.