Can I omit 'that'...?

So, Mister Micawber, to is the preposition before my stomach. Well, I guess this preposition has a special use in the medical field. But in layman's language, the preposition in can be used, too, right?

RommelWell, I guess this preposition has a special use in the medical field.

No, we all use it.

Rommel But in layman's language, the preposition in can be used, too, right?

It does not sound right to me.

Mister Micawber, after writing the sentence When I opened my eyes, I felt that I had an injury to my stomach, would it be fine if it the next sentences I use other words for injury and for stomach, as in the following example, so that these would not be redundant?

When I opened my eyes, I felt that I had an injury to my stomach. I co

Do as you wish, then; I do not see the point.

Mister MicawberI do not see the point.

As I said, I don't want the words injury and stomach repeated in the sentences. It might be a good idea if I use other words for injury (such as wound, incision, etc.) and other words for stomach (like belly, abdomen, etc.)? What do you think?

Rommel Mister MicawberI do not see the point.As I said, I don't want the words injury and stomach repeated in the sentences. It might be a good idea if I use other words for injury (such as wound, incision, etc.) and other words for stomach (like belly, abdomen, etc.)? What do you think?

I think it sounds like the work of a second-rate journalist.

Rommel It might be a good idea if I use other words for injury (such as wound, incision, etc.) and other words for stomach (like belly, abdomen, etc.)? What do you think?

No, that is not a good idea; it will just confuse or irritate the reader, as those words have somewhat different meanings and registers. Repetition needs to be avoided only in very long pass