For most people, the sensations they notice during hemodialysis come from things around the treatment—not from feeling the blood being filtered. Needle placement, muscle cramps, access discomfort, or a drop in blood pressure are the kinds of experiences that may stand out.
Quick answer
Hemodialysis treatment itself should not normally be painful. If you have a fistula or graft, placing the two dialysis needles can cause brief discomfort, especially when you are new to treatment. Some people also experience painful cramps or other symptoms during dialysis. Pain during or after treatment is worth telling your dialysis team about rather than assuming it is simply part of dialysis.
What may feel uncomfortable before treatment
The part many new patients think about most is needle placement. If you have an AV fistula or graft, two needles are usually placed into the access for treatment. NIDDK notes that a numbing cream or spray may be used when needle placement is bothersome, and the National Kidney Foundation recommends telling your dialysis team if cannulation is painful or stressful so they can discuss comfort options and needle-site rotation.
If you use a dialysis catheter, you do not have fistula or graft needles placed at each treatment. Staff instead clean and connect the catheter using sterile technique. New or increasing pain around any type of access is something to mention to the team rather than trying to interpret on your own.
Can you feel the dialysis machine cleaning your blood?
You normally do not feel your blood moving through the dialyzer or feel waste being filtered out. The filtering process itself does not create a sensation you can feel inside your body.
What you may notice instead are symptoms that happen during some treatments. NIDDK lists muscle cramps and sudden drops in blood pressure among possible problems during hemodialysis. A blood-pressure drop can be associated with weakness, dizziness, or nausea. These symptoms are not proof of one specific cause, so tell staff what you are feeling and when it started.
See the RCP guides on dialysis cramps and blood-pressure drops during dialysis for a closer look at those treatment-day experiences.
Pain around a fistula, graft, or catheter
Your access deserves its own category because pain at the access is different from simply feeling tired or crampy during treatment. Tell staff if you notice burning, sharp pain, increasing tenderness, tightness, swelling, wetness, or bleeding around the needle or access area.
For a fistula or graft, staff can look at the needle site, the access itself, blood-flow and pressure readings, and what changed around the time the discomfort started. If a needle has moved out of position, swelling or bruising may develop around the site. Read What Is Infiltration During Dialysis? for a plain-language explanation.
What might feel sore after dialysis?
If you have a fistula or graft, the needle sites can feel tender after the needles are removed and pressure is held. A small amount of bruising can also occur around a needle site. What matters is whether the discomfort is mild and settling or whether something feels different from your usual treatment.
Tell your dialysis team about pain that is new, worsening, persistent, or accompanied by noticeable swelling, redness, warmth, drainage, unusual bleeding, or a change in how your access feels. The National Kidney Foundation specifically advises reporting pain and other access changes rather than waiting for the next routine check.
When something hurts during treatment
Where is the discomfort, when did it start, and what does it feel like?
Staff can look at your access, vital signs, machine readings, and what was happening in treatment.
What changed afterward can help make the event easier to discuss if it happens again.
What your dialysis team can assess
Whether the discomfort is at the needle site, access, muscle, head, chest, or somewhere else.
Blood pressure, machine pressures, fluid-removal progress, position, or other treatment information.
When it started, how it feels, and whether anything else happened at the same time.
A useful question: What were you checking when I told you this hurt?
You do not have to simply “tough out” pain
If something hurts during dialysis, tell the staff caring for you rather than waiting until the end of the session. The location, timing, and type of discomfort can be useful information. Your care team can assess what was happening in your treatment and explain what they found.
Questions you can ask at the chair
- What were you checking when I told you I was hurting?
- Did anything change with my access, blood pressure, or machine readings around that time?
- If needle placement is difficult or painful for me, what comfort options does this clinic use?
- What details would be useful for me to remember if the same discomfort happens again?
- Is there anything about my access that you want me to watch between treatments?
Related dialysis guides
- Your First Hemodialysis Treatment: What to Expect
- Why Do I Get Cramps During Dialysis?
- Why Does Blood Pressure Drop During Dialysis?
- What Is Infiltration During Dialysis?