Mental Fog and Scrambled Thinking
Can I use "mental fog" to describe a person who is absent-minded, or it is a disease that I can't use in normal life?
What's the meaning of "scrambled thinking"? I have seen word used to describe a negative situation but I also seen it used in the mediation context. Therefore, I felt confused about the usage of this phrase.

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Hello, Irene! "Brain fog" or "mental fog" is a term used in medicine denoting an abnormality in the regulation of the overall level of consciousness.  So I suppose you can't use it for just an absent-minded person. "Scrambled thinking" or "Scrambled thoughts" these are mixed up, confused or tangled thoughts.

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Mental fog doesn't really describe absent minded. Some individuals are absent minded by nature it may be developing some kind of mental impairment. Mental fog converts a situation of temporary impairment and is likely caused by an acute illness or intoxication. All this said mental fog is not a technical term.

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I haven't heard mental fog used  fog is more for talking about the weather