O aplicativo CNH do Brasil mostra a restrição médica.

CNH stands for Carteira Nacional de Habilitação, which is the Brazilian driver’s license.

In everyday Brazilian Portuguese, people often just say CNH instead of the full name, much like English speakers say ID or DMV in certain contexts.

In this sentence, aplicativo CNH refers to an app related to the Brazilian driver’s license system.

Because do is the contraction of de + o.

• de = of / from
• o = the
• de + o = do

So:

• do Brasil = of Brazil or from Brazil

Portuguese very often contracts de with definite articles:

• de + o = do
• de + a = da
• de + os = dos
• de + as = das

That is why de Brasil would sound incomplete here.

O is the masculine singular definite article, meaning the.

• o aplicativo = the app

Portuguese uses definite articles more often than English does. In English, you might sometimes say Brazil’s CNH app without thinking much about an article, but in Portuguese, o aplicativo sounds natural and expected.

Because restrição is a feminine singular noun.

So:

• a restrição = the restriction

The adjective médica also has to agree with restrição, so it is feminine singular too:

• restrição médica

This agreement is very important in Portuguese.

Mostra is the third-person singular form of the verb mostrar in the present tense.

The subject is O aplicativo CNH do Brasil, which is singular, so the verb must also be singular:

• o aplicativo mostra = the app shows

A quick comparison:

• eu mostro = I show
• você/ele/ela mostra = you/he/she shows
• eles mostram = they show

In Portuguese, adjectives usually come after the noun.

So the normal order is:

• restrição médica = medical restriction

This is the standard pattern:

• carro novo = new car
• problema sério = serious problem
• restrição médica = medical restriction

Sometimes adjectives can come before the noun, but that usually changes the tone, style, or emphasis. In this sentence, the normal and natural order is restrição médica.

Yes. In Brazil, aplicativo is the standard full word for app.

Very commonly, people also just say app, especially in casual speech:

• o aplicativo do banco
• o app do banco

Both are common in Brazil.
Aplicativo is a bit more formal or complete; app is more casual and very common in daily use.

In the context of a driver’s license, restrição médica refers to a health-related condition or requirement recorded on the license.

For example, it could indicate something like:

• the driver must wear glasses
• the driver has some medical limitation relevant to driving
• the license has a health-based observation or condition

So it does not necessarily mean a serious illness. It can simply be an official medical note or limitation connected to driving eligibility.

It most naturally links the whole expression to Brazil: the CNH app of Brazil / Brazil’s CNH app.

In practice, a learner can understand it as identifying the app as the Brazilian one.

Structurally, Portuguese sometimes allows these noun groupings in a way that feels a little compact. So a natural English understanding is:

• the Brazilian CNH app
• Brazil’s CNH app

Yes, depending on context. Some alternatives that might sound natural are:

• O aplicativo da CNH mostra a restrição médica.
• O app da CNH mostra a restrição médica.
• O aplicativo da CNH brasileira mostra a restrição médica.

These alternatives may sound a little more explicit to some learners.

Still, the original sentence is understandable and grammatical.

In Brazil, letter names are usually said individually:

• C = cê
• N = ene
• H = agá

So CNH is pronounced roughly like:

• cê-ene-agá

This is how abbreviations are commonly read in Brazilian Portuguese.

A rough English-friendly guide is:

• restrição ≈ hes-tree-SOWN
• médica ≈ MEH-jee-kah or MEH-dee-kah, depending on accent and how closely you approximate Brazilian sounds

A few helpful points:

• ção is a very common ending in Portuguese, often sounding roughly like sown or syown to English ears.
• The stress in restrição is on the last syllable.
• The stress in médica is on mé.

Because it agrees with restrição, which is feminine.

In Portuguese, adjectives usually match the noun in:

• gender: masculine/feminine
• number: singular/plural

So:

• restrição médica = feminine singular
• restrições médicas = feminine plural

If the noun were masculine, the adjective would usually change too:

• problema médico = medical problem

Normally, that would sound unnatural in standard Portuguese.

Portuguese usually wants the articles here:

• O aplicativo...
• a restrição...

Leaving them out can sound like a headline, a label, or very clipped note-style language, not a normal full sentence.

So for ordinary speech and writing, keep:

• O aplicativo CNH do Brasil mostra a restrição médica.