My husband has fluid build up in his abdomen and pressure and bloating he will have a procedure done to take the fluid from his belly,his blood work is normal had a ultrasound done on his gall bladder it was normal what could cause this ? he isn't a heavy

Ascites: Fluid buildup in the abdomen, known as ascites, is often from liver disease, but can have many other causes. Since some of those illnesses can be serious, it is important to follow through with the work up to determine the cause. Removing some fluid is often helpful in making a diagnosis and may allow him to be more comfortable and breathe easier. Don't delay his medical care! Good luck.