胃に腫瘍ができたので切ってもらった。

I got a stomach tumor and had to have it operated on.

薬を飲み始めると、すぐに痛みなどの症状はとれてきますが、すぐに潰瘍がなおるわけではありません。

When you start taking medicine it begins working on symptoms, like pain, right away, but that doesn't mean that the ulcer heals right away.