He didn't need to go to hospital, but he went just to reassure himself.

他用不着去医院，去了只是想让自己放心点。（北美英语）

《牛津词典》

I had to go to hospital.

我得去医院看病。

《牛津词典》

He had to go to hospital for treatment.

他不得不去医院接受治疗。

《牛津词典》

One hundred thirty thousand have to go to a hospital for food poisoning.

VOA: special.2011.06.17

"And our problem is connecting the prenatal care with the delivery site, making sure the information about a patient travels with that patient when they go into labor and go to the hospital.

VOA: standard.2010.06.23

About 1, 200 Scots infants have to go to hospital every year due to rotavirus.

BBC: Babies born from May to be offered rotavirus vaccine

He'd been told to go to hospital immediately if he experienced any symptoms suggesting a recurrence.

BBC

The letter claimed she injured her left leg and right wrist and had to go to hospital.

BBC: Norfolk kerb trip PC Kelly Jones 'continuing claim'