Ascities is a disorder in which there is excessive fluid that accumulates in the abdominal cavity. Ascities may be caused by cirrhosis, alcoholic hepatitis and obstruction of the hepatic veins. Failure of the kidneys and failure of the heart can both lead to excessive generalized fluid accumulation. Cancer involving the abdominal cavity and tuberculosis involving the abdominal cavity can both produce ascities.
Cancer does not always cause it, wvweryone reacts differently.
Here are some related posts from Dr. Goodman regarding ascites.
http://www.medhelp.org/posts/show/376324
http://www.medhelp.org/posts/show/345223
Good luck and sorry about all this.