इलाज के दौरान सूजन कम होती है।

इलाज means treatment and के दौरान means during.

So इलाज के दौरान = during treatment or during the course of treatment.

A very literal breakdown is:

• इलाज = treatment
• के दौरान = during

This is a very common way to express during X in Hindi.

Because दौरान is used with the oblique form of the noun plus के.

So Hindi treats this as a postpositional phrase:

• इलाज → oblique form is still इलाज
• then add के दौरान

So:

• इलाज के दौरान = during treatment
• बैठक के दौरान = during the meeting
• यात्रा के दौरान = during the journey

You do not usually say का दौरान or की दौरान here.

सूजन means swelling or inflammation.

In this sentence, it is treated as a feminine singular noun. That matters because the verb phrase agrees with it:

• सूजन कम होती है
• not सूजन कम होता है

The feminine agreement is why you see होती.

होती है is the feminine singular habitual/simple present form of होना (to be / to happen / to become, depending on context).

Since सूजन is feminine singular, Hindi uses:

• होती है for feminine singular
• compare masculine singular: होता है

Here कम होती है literally means becomes less or is reduced.

So the sentence means something like:

• Swelling decreases during treatment
• Swelling goes down during treatment

Here कम means less or reduced.

In कम होती है, it works as part of the expression to become less. English learners often think of it as an adjective-like word, but in practice the whole phrase कम होना means:

• to decrease
• to lessen
• to go down

So:

• सूजन कम होती है = swelling decreases
• दर्द कम होता है = pain decreases
• बुखार कम होता है = fever goes down

It could.

Both are natural:

• सूजन कम होती है
• सूजन घटती है

The difference is mostly one of style and nuance:

• कम होती है = becomes less, goes down
• घटती है = decreases

कम होती है is very common and easy to understand in everyday Hindi.
घटती है is also correct and may sound a bit more direct or formal depending on context.

It is in the habitual/simple present form.

That does not always mean something happening right this second. It often expresses:

• a general truth
• a usual result
• what typically happens

So इलाज के दौरान सूजन कम होती है। means:

• Swelling decreases during treatment
• During treatment, swelling tends to go down

It sounds like a general medical statement, not necessarily a play-by-play action happening at this exact moment.

Yes. सूजन is the thing that is changing, so it is the grammatical subject.

Structure:

• इलाज के दौरान = time phrase
• सूजन = subject
• कम होती है = predicate / verb phrase

So literally:

• During treatment, swelling becomes less.

Hindi normally does not use articles like a, an, and the.

So सूजन can mean:

• swelling
• the swelling

Which one sounds best depends on context and translation.

That is why the same Hindi sentence could be translated as:

• Swelling decreases during treatment.
• The swelling decreases during treatment.

Both can be correct.

Yes, Hindi word order is flexible, though some orders sound more natural than others.

The original sentence:

• इलाज के दौरान सूजन कम होती है।

is very natural.

You could also say:

• सूजन इलाज के दौरान कम होती है।

This still means the same thing, but the focus shifts slightly toward सूजन first.

In many cases, Hindi puts time expressions like इलाज के दौरान near the beginning, which is why the original version sounds very normal.

Sometimes, but not always with exactly the same nuance.

• इलाज के दौरान = during treatment
• इलाज में = in treatment / in the treatment / while being treated, depending on context

For this sentence, इलाज के दौरान is clearer and more directly matches during treatment.

So:

• इलाज के दौरान सूजन कम होती है। = very natural for during treatment, swelling decreases

A natural translation would usually be one of these:

• Swelling decreases during treatment.
• The swelling goes down during treatment.
• During treatment, the swelling is reduced.

The Hindi sentence sounds like a general statement, often something you might hear in a medical explanation or read in health-related writing.

A simple pronunciation guide is:

ilaaj ke dauraan soojan kam hoti hai

Approximate notes:

• इलाज = ilaaj
• दौरान = dauraan
• सूजन = soojan
• होती = hoti
• है = hai

So the full sentence is:

ilaaj ke dauraan soojan kam hoti hai

A very rough English-style approximation would be:

ih-LAAJ kay dow-RAAN SOO-jan kum HO-tee hai