Student or Learner
As for the following sentences, which one would be better to mean " The patient had a difficult operation yesterday"?
A: The patient went thorugh a difficult operation yesterday.
B: The patient underwent a difficult operation yesterday.
'UNDERGO' (past tense 'underwent') has the meaning that one is subjected to something unpleasant. Compare the following, where we would not use "undergo/underwent":
She has been through a difficult time.
She went through some difficult times in her youth.
He went through a difficult time when his child took seriously ill.