Normally we say "causes of " something, not "causes for". "causes of your strain" is possible, but if you are talking about mental strain then "causes of your stress" may be better.
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Noname 8048If I say causes for your strain, I meant to use strain as general and abstract idea.but stating the causes are countable, I'm not sure if these nouns should agree with each other.Agreement is not necessary. You can have several causes for one strain.