If you're passing blood you ought to see a doctor.

如果便中带血，你就应该找大夫看看。

《牛津词典》

I tried to persuade her to see a doctor.

我极力劝她去看医生。

《牛津词典》

You ought to see a doctor about that cough.

你得找个大夫看看你的咳嗽。

《牛津词典》

The study shows the value in testing and treating HIV before a person even feels sick enough to see a doctor.

VOA: special.2011.05.18

We see this sign on drug stores and whenever we visit a doctor to get an order for medicine.

VOA: special.2009.03.22

That said, if it actually LOOKS like Waldo, you need to see a doctor.

CNN: Apparently This Matters: Size (Yes, THAT kind of size)

Waiting times to see a doctor for speedy diagnosis and treatment have come down.

BBC: Unhealthy Britain: nation's five big killers

But Schuchat specifically advised anyone who feels ill after returning from Mexico to see a doctor.

CNN: Regular flu season precautions advised in current outbreak