syouzyou wo zenbu iwanai mama sinsatu ga owatte simatte, ato de sukosi koukaisimasita.

症状を言う means to state / describe one’s symptoms.

Here, 症状 is the thing being said, so it takes を as the direct object:

• 症状を言う = to tell your symptoms
• 全部を言う would also be possible in some contexts, but here 全部 is modifying 言わない, so 症状を全部言わない means not say all of the symptoms

So 症状を全部言わない means to not tell all of one’s symptoms.

Here 全部 means all of them / all.

Because the sentence is about 症状, 全部 naturally means all of the symptoms. So:

• 症状を全部言わない = not say all the symptoms
• more natural English: not mention all my symptoms

It does not mean literally everything in the world here; the context limits it to the symptoms.

In this sentence, まま means something like:

• while remaining in that state
• without doing X
• with X left undone

So:

• 言わないまま = without saying (them) / leaving them unsaid

The pattern is:

• verb nai-form + まま

Examples:

• 食べないまま出かけた = I went out without eating.
• 言わないまま終わった = It ended without me saying it.

So 症状を全部言わないまま診察が終わってしまって means:

The appointment ended with me still not having mentioned all my symptoms.

Because 終わる is an intransitive verb.

• 終わる = to end, to be over
• 終える = to finish something

With 終わる, the thing that ends is marked by が:

• 診察が終わる = the examination/consultation ends

If you wanted an active transitive version, you would use 終える:

• 診察を終える = to finish the examination

But here the point is that the appointment ended, not someone finished it as the main focus. So 診察が終わって is correct.

〜てしまう often adds one of these nuances:

• something was completed fully
• something happened unfortunately
• something happened unintentionally
• the speaker feels regret, disappointment, or helplessness about it

Here, 終わってしまって suggests that the appointment ended before I got to say everything, and the speaker feels that this was unfortunate.

So:

• 診察が終わって = the examination ended
• 診察が終わってしまって = the examination ended, unfortunately / before I meant it to / to my regret

This matches the later 後悔しました, so the nuance is very natural.

The て-form links events together.

Here:

• 診察が終わってしまって、あとで少し後悔しました。

This means:

• The appointment ended without me saying all my symptoms, and later I regretted it a little.

The て connection can show sequence, cause, or background. In this sentence it does a bit of both:

1. first, the consultation ended
2. as a result / afterward, I regretted it

So it is a very natural way to connect the situation to the speaker’s later feeling.

あとで means later or afterward.

It comes from あと meaning after / later, and で turns it into an adverbial expression meaning at a later time.

So:

• あとで少し後悔しました = I regretted it a little later
• more natural English: I felt a bit of regret afterward

It does not mean a huge amount of time later necessarily. It could be shortly after the appointment.

Yes, 少し means a little / somewhat.

So 少し後悔しました means:

• I regretted it a little
• I felt somewhat regretful

This softens the statement. It suggests the speaker is not describing a huge, dramatic regret, just a mild one.

In Japanese, words like 少し, ちょっと, and similar softeners are very common because they make statements sound less absolute or harsh.

Not quite.

• 後悔しました = I regretted it
• 残念でした = it was unfortunate / I was disappointed

後悔する specifically implies I feel bad about something I did or failed to do. There is a sense of personal responsibility.

In this sentence, the speaker is regretting not mentioning all the symptoms, so 後悔しました is much more precise than 残念でした.

It can cover several close ideas depending on context.

診察 literally refers to a medical examination/consultation by a doctor. In natural English, depending on the situation, you might translate it as:

• the examination
• the consultation
• the appointment
• the doctor’s visit

In this sentence, the appointment or the consultation often sounds most natural in English, because the speaker is talking about the whole interaction ending before they said everything.

Because Japanese often omits information that is already clear from context.

Here, the person who:

• did not say all the symptoms
• later regretted it

is obviously the speaker, so 私は is unnecessary.

Japanese frequently leaves out subjects when they are understood. If you added 私は, it would still be grammatical:

• 私は症状を全部言わないまま診察が終わってしまって、あとで少し後悔しました。

But without 私は, the sentence sounds more natural in many everyday contexts.

Yes, but the nuance changes.

• 症状を全部言えなかった = I couldn’t say all my symptoms
• 症状を全部言わないまま診察が終わってしまって = The consultation ended with me still not having said all my symptoms

The original sentence focuses on the state remaining unresolved when the appointment ended. It paints the situation more vividly.

By contrast, 言えなかった focuses more directly on not being able to say them.

Both are possible, but the original wording emphasizes the frustrating timing: the visit ended before everything was said.

It breaks down like this:

• 症状を全部言わないまま
  = without saying all my symptoms

• 診察が終わってしまって、
  = the examination/appointment ended unfortunately, and...

• あとで少し後悔しました。
  = later I regretted it a little

So the full flow is:

1. I left some symptoms unsaid
2. the appointment ended
3. afterward I felt some regret

That is why the sentence sounds natural and cohesive in Japanese.