I have times when either my cannula or my Libre become itchy.
Although the usual recommendation is to change pump sets every 3 to 4 days, I usually change mine every other day to avoid the itch. I use SkinTac as a barrier to reduce the discomfort. My first cannula was very uncomfortable but I think this was a combination of a reaction to the stickiness and it being too deep. I quickly changed to inset 30 which go in at an angle.
Libre lasts a little longer but my current one is 10 days old and I can start to feel the niggle.
This one was strange when it was first inserted, it was as if I could actually feel the filament inside my arm for the first couple of days. Not all the time but when I moved my arm in certain (non repeatable) ways. That feeling eased. I had a week of nearly forgetting it was there and now the itchiness starts.
Thankfully, the itchiness goes as soon as the Libre is removed.
Sometimes, I can feel my cannula for a couple of days after it has been removed.
I always make sure to put my cannula in a different place to last time. This is easy for me as the insertion point remains for a week or so and my tummy looks like a dot to dot puzzle.
I sometimes wonder if my discomfort is associated with slight cannula movements when I move my pump around whilst the tube is still attached. This would only be associated with a tubey pump.
However, given a DexCom started to struggle with accurate readings after some stomach crunches, it makes sense that something embedded can be moved around if you do certain exercises in that area and those movements can make us more sensitive to them.
Sorry .. that was a bit of a ramble.
So for any TLDR:
- yes - itchiness
- maybe inserts move when we do certain movements and, as they re-embed themselves, we become sensitive to them.