Being on dialysis means a machine or a special fluid is doing the work your kidneys can no longer handle: filtering waste, removing excess fluid, and balancing the chemicals in your blood. It’s a life-sustaining treatment for people whose kidneys have lost most of their function, typically when they’re working at less than 15% capacity (stage 5 chronic kidney disease). Dialysis doesn’t cure kidney disease, but it keeps you alive and functioning while you manage the condition or wait for a transplant.
Why Someone Needs Dialysis
Healthy kidneys filter your blood around the clock, pulling out waste products, balancing electrolytes like potassium, and removing extra fluid through urine. When kidney function drops low enough, those waste products build up in your blood and fluid accumulates in your body. The most common trigger for starting dialysis is fluid retention that causes swelling in the legs or fluid buildup in the lungs that can’t be controlled with medication alone.
Other signs that dialysis may be needed include persistent nausea and vomiting (especially in the morning), severe itching, unexplained weight loss, loss of appetite, and constant fatigue. Dangerous levels of potassium or acid in the blood can also force the decision. According to the National Kidney Foundation, there’s no single lab number that dictates when to start. It’s a decision based on how you’re feeling and whether dialysis can relieve your symptoms, though most candidates have kidney function below 15%.
The Two Main Types
Hemodialysis
Hemodialysis is the more common form. Your blood is drawn out of your body through tubing, passed through a filtering device called a dialyzer, and returned clean. The dialyzer contains thousands of tiny hollow fibers that act like an artificial kidney. Your blood flows through these fibers while a cleaning solution called dialysate flows in the opposite direction on the outside, pulling waste and extra water out of your blood through the fiber walls.
Most people on hemodialysis go to a dialysis center three times per week. Each session typically lasts three to five hours. Some people do hemodialysis at home, which can allow for more frequent or longer sessions. Either way, it’s a significant time commitment that shapes your weekly schedule.
Peritoneal Dialysis
Peritoneal dialysis uses the lining of your own abdomen (the peritoneum) as the filter instead of a machine. A cleansing fluid is pumped through a catheter into your abdominal cavity, where it sits and absorbs waste from the blood vessels in that lining. After a set dwell time, the used fluid is drained out and replaced with fresh solution. The fluid contains a high concentration of glucose, which creates an osmotic pull that draws excess water out of your bloodstream.
There are two versions. Continuous ambulatory peritoneal dialysis (CAPD) is done manually throughout the day, with three to five exchanges over 24 hours, each taking about 30 to 40 minutes. You do it yourself during normal activities, with no machine required. Automated peritoneal dialysis (APD) uses a machine called a cycler that handles the exchanges overnight while you sleep. Many people prefer peritoneal dialysis because it offers more flexibility and independence.
How Your Body Is Connected
Hemodialysis requires a reliable access point where blood can flow out to the machine and back quickly. There are three options, each placed through minor surgery. A fistula is created by connecting an artery directly to a vein in your arm, which causes the vein to grow larger and stronger over time. This is generally considered the best long-term option because it lasts longer and has fewer complications. A graft uses a small piece of synthetic tubing to bridge an artery and vein in your arm when a fistula isn’t possible. A catheter is a soft tube placed into a large vein in the neck, usually as a temporary solution while a fistula or graft matures.
For peritoneal dialysis, a flexible catheter is surgically placed in your abdomen and stays there permanently. It’s the port through which fluid enters and exits your abdominal cavity.
What a Session Feels Like
Hemodialysis itself isn’t painful once the access is established, but the side effects during and after sessions are real. Low blood pressure is the most common problem, and it can bring on shortness of breath, nausea, vomiting, and abdominal cramps. Muscle cramps are also frequent, particularly as fluid is pulled from your body. Many people experience intense itching during or right after treatment. These side effects tend to be worse when a lot of fluid has built up between sessions.
The fatigue after hemodialysis is something almost everyone on dialysis describes. Many people feel wiped out for hours after a session, sometimes for the rest of the day. This “dialysis hangover” can make it difficult to work, exercise, or maintain a social life on treatment days. Peritoneal dialysis tends to cause fewer dramatic swings in how you feel because it works more continuously, but it comes with its own challenges, including the risk of infection at the catheter site and a feeling of fullness or bloating in the abdomen.
Diet and Fluid Changes
Being on dialysis means significant changes to what you eat and drink. Sodium intake needs to stay below 2,300 milligrams per day, which is less than a teaspoon of table salt. Depending on your blood work, you may also need to limit potassium (found in bananas, oranges, potatoes, and tomatoes) and phosphorus (found in dairy, nuts, and processed foods). People on more frequent home hemodialysis sometimes have fewer dietary restrictions because their blood is filtered more often.
Fluid management is one of the trickiest adjustments. When your kidneys can’t remove water effectively, every sip counts. Most hemodialysis patients aim to gain no more than about 2.2 pounds (1 kilogram) of fluid weight per day between sessions. Your specific fluid allowance depends on how much urine you still produce. Some people on dialysis still urinate regularly, which gives them more flexibility. Others produce very little urine and need to be much more careful. Thirst is a constant challenge, and many people rely on strategies like sucking on ice chips or chewing gum to manage it.
How Long People Live on Dialysis
This is often the first question people have, and the honest answer is that it varies enormously. Age, overall health, the underlying cause of kidney failure, and how closely someone follows their treatment plan all play a role. Data from the United States Renal Data System shows that median survival for people starting hemodialysis has been improving over time. For those who began dialysis in 2013, median survival was about 47 months (roughly four years), up from 37 months for those who started in 2003.
Those numbers represent the midpoint, meaning half of patients lived longer and half lived shorter. Many people live well on dialysis for 10, 20, or even 30 years. Younger patients and those without diabetes or heart disease tend to do significantly better. A kidney transplant, when possible, generally offers better long-term survival and quality of life than remaining on dialysis indefinitely.
How It Affects Daily Life
The time commitment alone reshapes your routine. Three sessions a week at a dialysis center, plus travel time and recovery, can consume 15 to 20 hours weekly. Many people struggle to maintain full-time employment, though some employers offer accommodations. Home dialysis options, whether hemodialysis or peritoneal, give back some of that control by letting you build treatment around your schedule rather than the other way around.
Travel is possible but requires planning. You need to arrange dialysis sessions at a center near your destination or bring peritoneal dialysis supplies with you. Emotional health takes a hit too. Depression and anxiety are common among people on dialysis, driven by the loss of spontaneity, physical fatigue, dietary restrictions, and the weight of depending on a treatment to survive. Support groups, mental health care, and staying as physically active as your energy allows all help.
Despite the challenges, many people on dialysis maintain meaningful, active lives. They work, travel, raise families, and pursue hobbies. The adjustment period is real, often taking several months, but most people find a rhythm that works for them over time.