A chemo port is most commonly placed under the skin on the right side of the chest, just below the collarbone. The device sits in a small pocket created beneath the skin, and a thin tube called a catheter threads from the port into a large vein, with its tip resting just above the heart. Less commonly, ports can be placed in the inner upper arm or in the abdomen below the ribcage.
Exact Placement on the Chest
The port itself is a small, round reservoir about the size of a quarter. During placement, the surgeon or interventional radiologist creates a pocket roughly 2 to 2.5 centimeters beneath the skin’s surface on the upper chest wall. The pocket sits below the collarbone and slightly off to one side. Most people receive their port on the right side, though the left side is used when needed.
Once healed, the port creates a small, firm bump you can feel and sometimes faintly see under the skin. It sits flush enough that clothing covers it completely, and because it’s fully beneath the skin, there are no external tubes or dressings to manage between treatments.
Where the Catheter Goes Inside the Body
The part you can’t see matters just as much as the port itself. A thin catheter connects to the port reservoir and threads into one of the large veins near the collarbone, typically the subclavian vein (which runs just beneath the collarbone) or the internal jugular vein in the neck. From there, the catheter follows the vein downward toward the heart.
The tip of the catheter needs to land in a very specific spot: the junction where the largest vein in the body meets the top of the heart. More precisely, it sits about 2 to 3 centimeters below where the windpipe splits into two branches, a landmark doctors can see on imaging. If the tip sits too high, there’s a greater risk of blood clots or the catheter shifting out of position. If it sits too low, inside the heart itself, it can cause dangerous complications. During the procedure, the doctor uses real-time X-ray imaging (fluoroscopy) to verify the tip lands in the right zone.
Arm and Abdominal Ports
Not everyone gets a chest port. An arm port is placed on the inner side of the upper arm, with the catheter threaded through one of the forearm or upper arm veins. The catheter still travels through the venous system and terminates in the same spot near the heart. Arm ports can be a good option for people who need to avoid the chest area, though they’re less common overall.
Abdominal ports are placed beneath the skin below the ribcage. These are typically used for delivering chemotherapy directly into the abdominal cavity rather than into the bloodstream, which is a different treatment approach used for certain cancers that affect the lining of the abdomen.
How the Port Is Placed
Port placement is a minor procedure, usually done with local anesthesia and sedation rather than general anesthesia. The doctor uses ultrasound to guide a needle into the target vein and fluoroscopy to watch the catheter thread into position in real time. A small incision on the chest creates the pocket for the port reservoir, and a second small incision may be made near the vein access point. The whole process typically takes under an hour.
After the catheter is in place and the tip position is confirmed on imaging, the port is flushed with saline to make sure it works. A chest X-ray is often taken afterward to confirm everything looks correct and to rule out any air leak around the lung, which is a rare but possible complication of accessing veins near the chest.
What It Feels Like After Placement
The incision site will be sore for the first few days. Full healing takes about 10 to 14 days. During the first week, you’ll need to keep the area dry and avoid activities that stretch or strain the neck and chest. For the first three days, avoid lifting anything heavier than about 10 pounds (roughly a gallon of milk). After one week, most people can return to all their normal activities.
For the first 24 hours after the procedure, you shouldn’t drive, drink alcohol, or operate machinery, since the sedation takes time to fully wear off.
How the Port Is Used During Treatment
Each time you need chemotherapy, blood draws, or IV fluids, a nurse inserts a special needle through the skin and into the rubber septum that covers the port reservoir. The septum is designed to reseal itself after each puncture. You’ll feel a brief stick when the needle goes in, similar to a regular blood draw, but many people find it far more comfortable than repeated IV insertions in the hand or arm.
Between treatments, the port sits quietly under the skin and requires periodic flushing to prevent clots from forming inside the catheter. Because the device is completely internal, you can shower, swim, and go about daily life without worrying about external lines. The port’s subcutaneous design also carries a lower infection risk compared to central lines that have tubing extending outside the body. Ports can remain in place for months or even years, depending on how long treatment lasts.
Possible Complications
Ports are considered safe and reliable, but complications can occur. The most common issues include infection, blood clot formation around the catheter, and the catheter tip shifting out of its ideal position over time. In rare cases, the skin over the port can thin and erode, especially in people with very little body fat in the chest area, eventually making the port visible through the skin. If this happens, the port usually needs to be removed and replaced.
Signs that something may be wrong include redness, swelling, or warmth around the port site, fever, pain during infusions, or swelling in the arm or neck on the same side as the port (which can signal a blood clot). These symptoms warrant prompt evaluation.