We say "have surgery" (not "have a surgery"). Follow the same practice with the expressions “require surgery”, “need surgery”, “undergo surgery”, etc.
We say "have surgery" (not "have a surgery").
My mother is going to have surgery.
My mother is going to have a surgery.
Follow the same practice with the expressions “require surgery”, “need surgery”, “undergo surgery”, “after surgery”, "from surgery", etc.
Some people require surgery to prevent corneal blindness.
The 25-year-old victim needs surgery after he was stabbed in the back.
Four of the injured underwent surgery yesterday.
He has just recovered from heart surgery.
Exceptions? Occasionally, you might hear “a surgery” to emphasize that it was one surgery, but it’s not very common. For example:
How many surgeries have you had? I had a surgery five yeas ago.
You can also use the article "a" if the noun "surgery" is preceded by an adjective; thus, we can say “a successful surgery”, “a complicated surgery”, etc.
It was a successful surgery.
Did you have a complicated surgery?
The plural form, surgeries, can be preceded by a determiner (many, several, different, some, etc.)
Some doctors perform many surgeries a day.
But omit it to talk about surgeries in a general sense.
Plastic surgeries are now safer
Be aware that the word surgery can also refer to a room in a hospital where doctors do surgery.
Take her up to surgery.
The doctor will be in surgery all morning.
