What is brain fog like? How can I better understand as a caregiver?

@julymt, this is such a good question that I made it into its own discussion to gather thoughts from people going through cancer treatment can share what brain fog is like (sometimes called chemo brain). Here's some info from Mayo Clinic
- Chemo brain https://www.mayoclinic.org/diseases-conditions/chemo-brain/symptoms-causes/syc-20351060

I'll start off the discussion.

Brain fog, like most side effects of cancer treatment, is different for each person. People can experience things like:
- trouble focusing, even on simple and common tasks. It's like the mind is on slow speed and then gives up
- difficulty finding words. With brain fog, a person might know what they want to say, but just can't seem to find the words
- fatigued. I describe fatigue as different from tired. It's like the mind and the whole body is wearing a heavy led suit covered in cotton balls. (Not sure if that makes sense. It's a heaviness within a fog.)

Sometimes, as a caregiver, you might notice that someone appears to be making an extra special effort to concentrate on something that should be almost automatic, like the spelling of a name they know.

Is your significant other currently on treatment, like chemo?