Studia medicina.

Studia is the third-person singular present indicative form of studiare (to study).

So it can mean:

• he studies
• she studies
• it studies (rare, depending on context)

It can also be the informal imperative (Study!) when speaking to tu, but if the meaning has already been given to you, the context will tell you which one is intended.

Italian often omits subject pronouns because the verb ending already shows the person and number.

• studio = I study
• studi = you study
• studia = he/she studies
• studiamo = we study
• studiate = you all study
• studiano = they study

So Studia medicina is perfectly natural without lui/lei.
You would usually add the pronoun only for emphasis, contrast, or clarity.

For example:

• Lei studia medicina. = She studies medicine.
  This is more explicit, but often unnecessary.

After studiare, the name of a subject, discipline, or field of study often appears without an article.

So:

• studia medicina = studies medicine
• studia matematica = studies mathematics
• studia storia = studies history

This is similar to English, where you also usually say study medicine, not study the medicine.

It usually means medicine as a field of study.

So Studia medicina normally means that someone is studying medicine at university or as an academic subject.

Depending on context, it could suggest:

• medical school
• a degree in medicine
• the discipline of medicine

In other words, it is broader than just memorizing one school subject for a test.

Because medicina is the direct object of studia.

Italian normally uses the order:

verb + object

So:

• Studia medicina
• Legge un libro
• Impara l’italiano

This is the most neutral word order.
You can change word order for emphasis, but the basic pattern here is very standard.

If taken as a statement, yes: it is the present tense.

But the Italian present can cover a few ideas that English also sometimes expresses in different ways, such as:

• He/She studies medicine
• He/She is studying medicine
  (depending on context)

Italian often uses the simple present where English might use either present simple or present continuous.

So context matters.

Yes, it could, because studia is also the tu imperative of studiare.

So by itself, Studia medicina! could mean:

• He/She studies medicine.
• Study medicine! (said to one person informally)

Usually punctuation, tone, and context make the meaning clear.

For example:

• Marco studia medicina. = Marco studies medicine.
• Se vuoi fare il medico, studia medicina! = If you want to be a doctor, study medicine!

Studia is pronounced roughly like STOO-dya.

A helpful approximation for English speakers:

• stu- sounds like stoo
• -dia sounds like dya

So it is not pronounced as three fully separate English-style syllables like stu-di-a.
The di + a combination tends to glide together.

Yes, medicina is a feminine singular noun.

You can tell from forms like:

• la medicina = the medicine / medicine

But in Studia medicina, that gender does not visibly affect the verb, because Italian verbs in the present tense do not agree in gender with the object.

So:

• Lui studia medicina
• Lei studia medicina

The verb studia stays the same.

The infinitive is studiare, meaning to study.

It is a regular -are verb.

Present tense:

• io studio
• tu studi
• lui/lei studia
• noi studiamo
• voi studiate
• loro studiano

So studia comes directly from that normal conjugation pattern.