In the western world, there was no western medicine and biochemistry in ancient times. Who should I see?

There was no western medicine (modern medicine) in ancient times in the western world, but the west also has its own traditional medicine (called traditional western medicine for the time being) like China.

A remarkable feature of traditional western medicine is that it highly advocates bloodletting therapy. At that time, bloodletting therapy was not less systematic than traditional Chinese medicine, such as bloodletting according to complex procedures such as constellation, time, disease, location and dose. However, with the rise of modern medicine, these backward knowledge has been falsified gradually, so there is western medicine (modern medicine) that we see now.

By the way, the history of human medicine has a long history, and it is different in different periods and regions. If you are interested, you can borrow books like General History of Medicine from the library to learn more.