Ascites is treated with a combination of sodium restriction, diuretics, and fluid drainage procedures, depending on severity. Most cases are caused by liver cirrhosis, and treatment focuses on reducing the pressure that forces fluid into the abdomen while removing fluid that has already accumulated. The approach escalates in steps: dietary changes and medications come first, with procedures reserved for cases that don’t respond.
Why Treatment Depends on the Cause
About 80% of ascites cases stem from cirrhosis, where scarring in the liver raises pressure in the portal vein system, pushing fluid into the abdominal cavity. The remaining cases can result from cancer, heart failure, kidney disease, or infections. Doctors use a simple blood test to distinguish between these: they compare albumin (a protein) levels in your blood to levels in the abdominal fluid. A difference of 1.1 g/dL or more points to portal hypertension with 97% sensitivity. A smaller gap suggests cancer, infection, or low protein levels as the driver.
This distinction matters because the treatments differ significantly. Cirrhosis-related ascites responds well to diuretics and salt restriction. Cancer-related ascites often does not, and typically requires drainage procedures or other interventions tailored to the underlying malignancy.
Sodium Restriction: The Foundation
Limiting sodium intake to less than 2 grams per day is the starting point for managing cirrhosis-related ascites. Your kidneys retain sodium when liver disease disrupts normal hormone signaling, and that retained sodium pulls water into the abdomen. Cutting sodium intake helps slow or stop new fluid accumulation.
In practice, this is harder than it sounds. Most sodium in the typical diet comes from processed and restaurant foods, not the salt shaker. Canned soups, deli meats, bread, condiments, and frozen meals can each contain 500 to 1,000 mg per serving. Staying under 2,000 mg means reading every label and cooking most meals at home. One important safety note: potassium-based salt substitutes, which many people turn to for flavor, can be dangerous if you’re taking certain diuretics. The combination can push potassium levels dangerously high, particularly if you also have kidney problems.
Sodium restriction alone won’t reverse existing ascites in most people, but it prevents the situation from worsening and makes diuretics more effective.
Diuretics: Stepped-Up Medication
Diuretic therapy follows a “stepped care” approach, starting with a single medication and adding a second only if needed. The first-line drug is a potassium-sparing diuretic that blocks a hormone called aldosterone, which drives sodium retention in cirrhosis. Treatment typically starts at 100 mg per day and can be increased every few days up to 400 mg per day.
If the maximum dose alone isn’t enough, a second diuretic (a loop diuretic) is added, starting at 40 mg per day and increasing up to 160 mg per day. This combination works on different parts of the kidney to maximize fluid output while trying to keep potassium levels balanced.
The goal is steady, controlled weight loss: 300 to 500 grams per day (roughly 0.7 to 1.1 pounds) if you only have abdominal fluid, or up to 1 kilogram per day (about 2.2 pounds) if you also have swelling in your legs. Losing fluid faster than this can cause kidney problems, low blood pressure, and dangerous electrolyte shifts. Daily weigh-ins at the same time each morning are the most practical way to track progress at home.
Paracentesis: Draining Fluid Directly
When ascites is severe, causing significant abdominal pressure, shortness of breath, or discomfort, doctors can drain the fluid directly through a needle inserted into the abdomen. This procedure, called paracentesis, provides fast relief, often within the same visit. It’s both a diagnostic tool (the fluid can be tested) and a treatment.
For large-volume drainage (removing more than 5 liters at once), you’ll receive an albumin infusion to prevent circulation problems. The standard approach is roughly 6 to 8 grams of albumin per liter of fluid removed, with the total dose adjusted based on volume: 25 grams for 5 to 6 liters, 50 grams for 7 to 10 liters, and 75 grams for more than 10 liters. Without albumin replacement, removing large amounts of fluid can cause a drop in blood pressure and kidney dysfunction.
Paracentesis is safe and effective, but it treats the symptom, not the cause. Fluid typically reaccumulates within one to three weeks, meaning repeat procedures are common for people whose ascites doesn’t respond fully to diuretics.
Refractory Ascites: When Standard Treatment Fails
Ascites is considered “refractory” when it can’t be controlled with maximum diuretic doses and sodium restriction, or when diuretic side effects become too severe to continue treatment. This affects roughly 5 to 10% of people with cirrhosis-related ascites and marks a more serious stage of disease.
There are two patterns. In diuretic-resistant ascites, the medications simply don’t move enough fluid even at full doses. In diuretic-intractable ascites, the drugs technically work but cause complications like kidney injury, dangerously low sodium, or severe potassium imbalances that force doctors to stop or reduce them. Either way, the next step is typically repeated paracentesis or a more permanent intervention.
TIPS: A Shunt to Reduce Pressure
For refractory ascites, one option is a procedure that creates a new channel inside the liver to redirect blood flow and reduce portal pressure. A radiologist threads a catheter through the neck vein into the liver and places a small metal stent connecting two veins, bypassing the scarred liver tissue that’s causing the pressure buildup.
This procedure has strong evidence for treating refractory ascites and can significantly reduce or eliminate the need for repeated fluid drainage. However, it’s not suitable for everyone. It’s ruled out for people with severe heart failure, advanced liver failure, severe lung hypertension, polycystic liver disease, or active infection. The main risk is hepatic encephalopathy, a buildup of toxins in the brain that causes confusion, since the shunt diverts blood around the liver’s filtering system. This affects a meaningful percentage of patients and sometimes requires the shunt to be narrowed or closed.
Treating Cancer-Related Ascites
Ascites caused by cancer (most commonly ovarian, breast, colon, or pancreatic) behaves differently from cirrhosis-related ascites. Diuretics are less effective because the fluid accumulation is driven by tumor cells lining the abdominal cavity rather than portal hypertension. Treatment focuses on controlling the cancer itself and managing symptoms through drainage.
For people who need frequent paracentesis, an indwelling peritoneal catheter offers an alternative. This is a small tube placed through the abdominal wall that stays in permanently, allowing fluid to be drained at home. Most people drain daily or every other day, removing up to 2 liters per session. The initial drainage after placement can be much larger, sometimes several liters.
Studies consistently show symptom improvement with these catheters, particularly for bloating and abdominal discomfort. Complication rates are relatively low: catheter malfunction occurs in about 5.7% of cases, infection in 5.4%, and leakage in 4.1%. The tubes can be placed as an outpatient procedure and caregivers can be trained to manage drainage at home, which avoids repeated hospital visits for paracentesis.
Preventing Infection in Ascitic Fluid
One of the most dangerous complications of ascites is spontaneous bacterial peritonitis, an infection that develops in the abdominal fluid without any obvious source like a ruptured organ. It occurs because bacteria from the gut can cross into the fluid, and the immune defenses in cirrhosis are weakened.
Preventive antibiotics are recommended in three situations: if the protein level in your ascitic fluid is very low (below 1.5 g/dL) combined with kidney dysfunction or advanced liver failure, if you have active gastrointestinal bleeding, or if you’ve had a previous episode of this infection. Anyone who has survived one episode has a high chance of recurrence and typically stays on daily antibiotics indefinitely.
Symptoms of this infection include fever, abdominal pain, and worsening confusion. It requires urgent treatment, so any new or worsening symptoms in someone with known ascites should prompt rapid evaluation. A sample of abdominal fluid is tested to confirm the diagnosis.
Liver Transplant as Definitive Treatment
For cirrhosis-related ascites, the only treatment that addresses the root cause is liver transplantation. The development of ascites is itself a turning point in cirrhosis: it signals decompensated disease and a significant drop in life expectancy without transplant. Refractory ascites, in particular, carries a median survival of roughly six months to two years with medical management alone, which is why transplant evaluation is typically initiated as soon as ascites proves difficult to control.
Not everyone qualifies for transplant, and wait times vary significantly by region and blood type. In the interim, the treatments described above serve as bridges to keep symptoms managed and prevent complications.