La médica cree que no es nada serio, pero recomienda reposo porque el pie sigue hinchado.

Médica is the feminine form of médico. Since the doctor in the sentence is a woman, Spanish uses la médica.

In Spain, both la médica and la doctora are common, though médica is especially clear if you want to mean physician/doctor as a profession.

Cree is the third person singular present tense of creer = to believe / to think.

So:

• yo creo = I think
• tú crees = you think
• ella cree = she thinks

Here, la médica cree means the doctor thinks.

Because after an affirmative verb like creer (to think / believe), Spanish normally uses the indicative, not the subjunctive.

So:

• Cree que no es nada serio = She thinks it is nothing serious

But if you make creer negative, the subjunctive becomes natural:

• No cree que sea nada serio = She doesn’t think it is anything serious

That is a very common pattern:

• creo que + indicative
• no creo que + subjunctive

Literally, it is something like it is not anything serious.

In natural English, that becomes:

• it’s nothing serious
• it’s not serious

Here, nada does not mean a complete absence of a thing in a literal way; it is part of a very common expression:

• no es nada grave
• no es nada serio

These both mean it’s nothing serious.

In no es nada serio, serio describes the seriousness of the condition, not a temporary physical state like location or mood.

So Spanish uses ser:

• es serio = it is serious

By contrast, hinchado describes a physical state, so that part works with estar-type meaning:

• está hinchado = it is swollen

In this sentence, that idea appears as sigue hinchado = it remains/still is swollen.

Recomienda reposo means she recommends rest.

There is no article because reposo is being used in a general, uncountable sense, much like English rest.

Compare:

• recomienda reposo = recommends rest
• necesita descanso = needs rest

Adding an article would usually change the meaning or sound less natural here.

Both can relate to rest, but reposo often sounds more medical or doctor-like.

• reposo = rest, often prescribed or recommended for recovery
• descanso = rest, break, relaxation more generally

So in a medical sentence, recomienda reposo is very natural.

Because porque means because, while por qué means why.

• porque = because
• por qué = why

So here:

• recomienda reposo porque el pie sigue hinchado = she recommends rest because the foot is still swollen

Sigue hinchado means is still swollen or remains swollen.

It uses seguir + adjective/participle:

• seguir cansado = to still be tired
• seguir abierto = to still be open
• seguir hinchado = to still be swollen

The key idea is continuation: the foot was swollen before, and it has not stopped being swollen.

Because hinchado agrees with el pie, and pie is a masculine noun.

So:

• el pie hinchado
• la mano hinchada

Adjectives in Spanish usually agree in gender and number with the noun they describe.

Yes. El pie está hinchado is correct and means the foot is swollen.

But el pie sigue hinchado adds an extra idea:

• está hinchado = it is swollen
• sigue hinchado = it is still swollen

So sigue emphasizes that the swelling continues.

Because Spanish often omits the subject when it is already clear.

The full version could be:

• La médica cree que no es nada serio, pero la médica recomienda reposo...

But that sounds repetitive. Once la médica has been introduced, Spanish normally leaves it out:

• La médica cree..., pero recomienda...

The verb form recomienda already shows it is she/he/it. Context tells us it refers to la médica.

Because pero joins two contrasting ideas, and in Spanish it is normal to put a comma before it in a sentence like this.

Here the contrast is:

• The doctor thinks it’s nothing serious
• but she still recommends rest

So the comma helps separate those two parts clearly.