Lääkäri tarkisti sydämeni.

Finnish has no articles, so there is no separate word for the or a/an.

So lääkäri can mean:

• doctor
• a doctor
• the doctor

The context tells you which English translation fits best.

In this sentence, lääkäri is also in the nominative singular, which is the basic dictionary form and the normal form for the subject of the sentence.

Tarkisti is the past tense of tarkistaa, which means to check, to inspect, or to examine.

Breakdown:

• tarkistaa = to check
• tarkisti = checked

It is third person singular, so it matches a singular subject like lääkäri.

So:

• Lääkäri tarkisti = The doctor checked

In Finnish, possession is often shown with a possessive suffix attached directly to the noun.

Here:

• sydän = heart
• -ni = my

So sydämeni means my heart.

This is very common in Finnish. Instead of using a separate word like English my, Finnish often adds the owner directly to the noun.

Because sydän is one of those Finnish nouns whose stem changes when endings are added.

Its basic form is:

• sydän = heart

But when many endings are attached, the stem becomes:

• sydäme-

So:

• sydäme-
  • ni = sydämeni

You can see the same stem in other forms too:

• sydämen = of the heart
• sydämessä = in the heart
• sydämeni = my heart

So this is not random; it is part of the noun’s normal inflection pattern.

This is about the Finnish object case.

In Lääkäri tarkisti sydämeni, the action is presented as a completed whole: the doctor checked your heart. Because of that, Finnish uses a total object.

With a normal noun, that often looks like this:

• Lääkäri tarkisti sydämen. = The doctor checked the heart.

But when a noun has a possessive suffix, the total-object form often looks like:

• sydämeni = my heart

So sydämeni is the natural choice here.

If you said sydäntäni, that would be the partitive form, which often suggests something more ongoing, incomplete, or less bounded:

• Lääkäri tarkisti sydäntäni.

That could sound more like the doctor was examining my heart rather than simply stating the completed event.

Because -ni already means my, so minun is not necessary.

So these both can mean my heart:

• sydämeni
• minun sydämeni

The shorter form with just the suffix is very normal in standard Finnish.

Adding minun can give:

• extra emphasis
• extra clarity
• a more contrastive feeling, like my heart, not someone else’s

In everyday spoken Finnish, people very often use other patterns too, such as:

• mun sydän

So Finnish has several ways to express possession, depending on style and situation.

Not completely. Finnish word order is more flexible than English word order.

The sentence Lääkäri tarkisti sydämeni uses the most neutral order:

• subject + verb + object

That is the safest basic pattern for learners.

Other orders are possible, but they change the emphasis. For example, putting sydämeni first would make my heart more prominent. So the original sentence is the most neutral, straightforward way to say it.

A few helpful points:

• ä is a front vowel that does not exist exactly the same way in English. It is somewhat like the vowel in cat for many speakers, but keep it clearly forward in the mouth.
• A double vowel is pronounced longer, not as two separate syllables.

So:

• Lääkäri = roughly LAA-kä-ri, with a long ää
• sydämeni = SY-dä-me-ni
• tarkisti = TAR-kis-ti

Also:

• Finnish stress normally falls on the first syllable
• letters are pronounced quite consistently compared with English

In theory, yes: with possessive suffixes, Finnish can sometimes make the singular and plural look the same in the nominative.

So sydämeni can, depending on context, mean:

• my heart
• my hearts

But in this sentence, only my heart makes sense.

Learners often notice this kind of ambiguity, but in real use, context usually makes the meaning clear immediately.

Yes.

Because Finnish has no articles, Lääkäri tarkisti sydämeni can match either:

• A doctor checked my heart
• The doctor checked my heart

The difference is usually supplied by context, not by the Finnish sentence itself.