I was looking up the meaning of the phrase "変な気を起こすなよ" when I came by this
site <https://nic-english.com/phrase/dont-get-any-ideas/> One of the example
sentences is:

> 「I don’t want him getting any ideas.（彼が変な気を起こしても困る）」など。

Why is ても being used here? What is the nuance ても contains here? Wouldn't a
conditional like と or たら be better?
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question
meaning nuances
How does ても function here? It seems like to me as if it was used with たら like meaning, is that possible?
First off, the following two are grammatically fine as you guessed.

  * 彼が変な気を起こすと困る
  * 彼が変な気を起こしたら困る

In dictionary terms, the usage of ても should be [the
following](https://dictionary.goo.ne.jp/word/%E3%81%A6%E3%82%82/#jn-152504):

> 多く「にしても」「としても」の形で）ある事柄を仮定条件として認めて、下の文の叙述を起こす意を表す。「自信があるにし―、試験を受けるのはいやな気分だ」

The difference from と/たら is subtle, but ても makes it explicit that it is a
hypothesis while と/たら sentences above sounds plain _if..._ that is neutral to
the possibility of his getting ideas.

Of the と/たら sentences, と still sounds close enough to ても, but using たら sounds
(a bit) like the speaker really worried.

In English, the ても sentence may be closer to "Suppose he got an idea. Then I
wouldn't like it".
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> 彼が変な気を起こしても困る。  
>  彼が変な気を起こすと困る。  
>  彼が変な気を起こしたら困る。

These are all fine in that context. One difference is that the last two also
directly answer the question 何が困る？ or どうなったら困る？ while the first doesn’t. It’s
more about a possible reason why something should not be done. Him getting
“any ideas” is an unintended, though easily anticipated, effect of her action.
Since there is that possibility, she should refrain from acting in a certain
way towards him. も kind of implies it’s one of the things that may happen as a
result of the action.
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answer