This is a real thing. I’ve read several times that doctors are not convinced that it exists and that it is hard to test. Nearly everyone I’ve talked to who has undergone chemo experiences various cognitive affects. It is hard to quantify at times, but it is a real thing.
A rather humorous example that happened to me not too long ago …
I arrived early to a doctor’s appointment and sat in the car for a bit beforehand since the AC inside the office is always set awfully low. When I got out of the car and pressed the button to lock the doors, I thought it was odd that the horn didn’t beep. I unlocked and re-locked the car, checking each time that the door locked or unlocked as expected. When it appeared to work, I went inside. After my appointment, I walked out to my car and realized that it was still running. Since my car has keyless entry, I was able to take my key inside my appointment, leaving my car running the entire time.
So, glad to know that my car wasn’t stolen, but this was a good example of how chemo affects your reasoning ability. Any time under stress or a situation that causes heightened awareness, lowers my ability to think clearly or well.
Chemo brain is a real thing and it can have such far reaching effects in the long run. My best solution has been to slow down, to take notes more often, and to give everyone around me the freedom to remind me repeatedly. I forget a lot and have to rely on those around me to keep me on my toes.