Paracentesis is a medical procedure used to remove excess fluid from the abdominal cavity. This fluid buildup can occur due to various conditions, such as liver disease, heart failure, or infection. During the procedure, a doctor inserts a thin needle through the abdominal wall to collect the fluid for analysis or to relieve pressure. The procedure is typically performed under local anesthesia and can be done in a hospital or outpatient setting. Patients may experience mild discomfort, but serious complications are rare. The collected fluid can help diagnose underlying health issues and guide further treatment.