Después de correr, me entra hambre.

After después de, Spanish normally uses an infinitive when the subject stays the same.

So:

• Después de correr = After running / After I run
• not después de corro

Corro is a conjugated verb form, and it cannot directly follow de here.

A useful pattern is:

• después de + infinitive

Examples:

• Después de comer, descanso.
• Después de estudiar, salgo.

You may also hear structures with después de que, but then you need a full clause:

• Después de que corro, me ducho is not the most natural way to say this idea.
• More natural: Después de correr, me ducho.

Literally, it means something like hunger enters me or hunger comes over me.

That sounds strange in English, but in Spanish this is a very natural way to express the idea that a feeling begins to appear.

So:

• Me entra hambre = I start to feel hungry / I get hungry

The verb entrar normally means to enter, but in expressions like this it means that a sensation, feeling, or urge starts affecting you.

Similar expressions:

• Me entra sueño = I get sleepy
• Me entran ganas de reír = I feel like laughing
• Me entró miedo = I got scared / fear came over me

The me is an indirect object pronoun. It shows who the hunger affects.

So:

• me = to me
• te = to you
• le = to him/her/you (formal)
• nos = to us
• os = to you all (used in Spain)
• les = to them/you all

Examples:

• Me entra hambre = Hunger comes over me
• Te entra sueño = Sleepiness comes over you
• Nos entra prisa = We start to feel rushed

It is not a reflexive pronoun here. It does not mean I enter myself. It just marks the person experiencing the feeling.

Because the grammatical subject is hambre, and hambre is singular.

In Spanish, the verb agrees with the subject, not with me.

So:

• me entra hambre
• subject = hambre
• verb = singular entra

Compare:

• Me entra sueño → singular, because sueño is singular
• Me entran ganas de comer → plural, because ganas is plural

This is an important pattern:

• Me entra hambre
• Me entran ganas de...

They are related, but not identical.

• Tengo hambre = I am hungry
• Me entra hambre = I get hungry / I start feeling hungry

So tengo hambre describes your current state, while me entra hambre emphasizes the beginning of that feeling.

For example:

• Ahora tengo hambre. = I’m hungry now.
• Después de correr, me entra hambre. = After running, I get hungry.

In many situations, me entra hambre feels more vivid and idiomatic because it describes hunger as something that suddenly appears.

Yes, absolutely.

That sentence is correct and natural:

• Después de correr, tengo hambre.

The difference is mainly one of nuance:

• Tengo hambre = a simple statement of fact
• Me entra hambre = hunger starts to come on after running

So if you want to express a routine reaction or the onset of hunger, me entra hambre works especially well.

Hambre is a feminine noun.

That is why adjectives are feminine:

• mucha hambre
• tanta hambre

But in the singular, it often takes el instead of la:

• el hambre

This happens because feminine singular nouns that begin with a stressed a- or ha- sound often use el for pronunciation reasons:

• el agua
• el águila
• el hambre

But they are still feminine, so adjectives stay feminine:

• el hambre intensa
• mucha hambre

In your sentence, there is no article, so you do not see this issue directly.

Because in this expression, hambre is used as a general, uncountable feeling, not as a specific thing.

So Spanish simply says:

• Me entra hambre

Not:

• Me entra la hambre ❌

This is similar to other fixed expressions:

• tener hambre
• tener sueño
• dar miedo

Many bodily states and feelings appear without an article in these common patterns.

The comma is very normal and helpful because Después de correr is an introductory phrase.

So:

• Después de correr, me entra hambre.

This is the clearest written version.

In shorter sentences, Spanish sometimes omits such commas, but here the comma is recommended because it separates the time expression from the main clause neatly.

Yes. Spanish word order is flexible.

These are all possible:

• Después de correr, me entra hambre.
• Me entra hambre después de correr.

Both are natural.

The first version puts the time expression first, which sounds a bit more structured or explanatory. The second puts the main idea first: I get hungry.

Spanish often moves parts around for emphasis, but the meaning stays basically the same.

Yes, this sounds natural in Spain.

In everyday Spanish from Spain, me entra hambre is a very normal way to say I get hungry.

You might also hear:

• Después de correr, me da hambre.
• Después de correr, tengo hambre.

All three are understandable and natural, but with slightly different shades:

• me entra hambre = hunger comes on
• me da hambre = something makes me hungry / I get hungry
• tengo hambre = I’m hungry

In Spain, me entra hambre is a very idiomatic choice.

Yes, very often. This is a productive pattern in Spanish.

Common examples:

• Me entra sueño. = I get sleepy.
• Me entra sed. = I get thirsty.
• Me entra miedo. = I get scared.
• Me entra risa. = I start laughing / I get the giggles.
• Me entran ganas de salir. = I feel like going out.

So this sentence is useful not just by itself, but as a model for many other expressions.