Avui no treballo gaire perquè tinc mal de cap.

Catalan often drops subject pronouns when they are not needed, because the verb ending already shows who the subject is.

• treballo = I work
• tinc = I have

The -o ending tells you it is first person singular. So jo treballo and jo tinc are possible, but usually jo is omitted unless you want emphasis or contrast.

For example:

• Avui no treballo gaire = normal
• Jo avui no treballo gaire = more emphatic, like I’m not working much today

Because it is the present tense, first person singular form of treballar (to work).

The verb pattern is:

• jo treballo = I work
• tu treballes = you work
• ell/ella treballa = he/she works
• nosaltres treballem = we work
• vosaltres treballeu = you all work
• ells/elles treballen = they work

So in this sentence, treballo specifically means I work / I am working.

In this sentence, gaire means much or very much, and it is used with the negative:

• no ... gaire = not much / not very much

So:

• no treballo gaire = I don’t work much

This is a very common pattern in Catalan.

Compare:

• treballo molt = I work a lot
• no treballo gaire = I don’t work much

Usually, gaire is most common in negative sentences, questions, and some other contexts.

Very common uses:

• No menjo gaire. = I don’t eat much.
• Treballes gaire? = Do you work much?
• Si en vols gaire, compra’n més. = If you want a lot of it, buy more.

In a straightforward positive sentence, Catalan more often uses molt:

• Treballo molt. = I work a lot.

So in your sentence, no ... gaire is exactly the natural pattern.

Perquè as one word usually means because.

So here:

• perquè tinc mal de cap = because I have a headache

Catalan distinguishes several similar forms:

• perquè = because / so that
• per què = why / for what reason
• per a què = what for / for what purpose

Examples:

• No surto perquè plou. = I’m not going out because it’s raining.
• Per què no surts? = Why aren’t you going out?

So in your sentence, perquè is the conjunction because.

Catalan commonly expresses many physical problems with tenir (to have), just like Spanish and unlike some English patterns.

So:

• tinc mal de cap = literally I have head pain
• natural meaning: I have a headache

This is a fixed, very common way to talk about pain.

Other examples:

• tinc mal de coll = I have a sore neck / neck pain
• tinc mal d’esquena = I have back pain
• tinc mal de panxa = I have a stomach ache

So even if the structure is different from English, it is completely normal Catalan.

Mal de cap is a fixed expression meaning headache.

It is made up of:

• mal = pain / ache
• de = of
• cap = head

So literally it is pain of head.

This mal de + body part pattern is very common:

• mal de queixal = toothache
• mal de gola = sore throat
• mal de panxa = stomach ache

You should learn mal de cap as one chunk, because it behaves like a set expression.

Because in this expression Catalan normally uses the fixed pattern mal de + noun, without the article.

So the natural form is:

• mal de cap

not usually:

• mal del cap

This is just how the idiom is built. It works the same way in many similar expressions:

• mal de coll
• mal de gola
• mal d’orella

So the absence of the article is part of the standard expression, not a mistake or omission.

Yes. Em fa mal el cap is also very natural Catalan and means my head hurts or I have a headache.

There is a slight difference in structure:

• tinc mal de cap = I have a headache
• em fa mal el cap = my head hurts / the head hurts to me

Both are common and correct. In everyday speech, either can be used depending on what you want to emphasize.

Your sentence uses tinc mal de cap, which is a very standard and simple way to express it.

In Catalan, standard negation is formed with no placed before the verb.

So:

• treballo = I work
• no treballo = I do not work / I’m not working

Then you can add other words after it:

• no treballo gaire = I don’t work much
• no tinc temps = I don’t have time

This is much simpler than English, because Catalan does not need an extra auxiliary like do in this kind of sentence.

The given order is very natural:

• Avui no treballo gaire perquè tinc mal de cap.

But Catalan word order is somewhat flexible, especially for emphasis.

For example:

• No treballo gaire avui perquè tinc mal de cap.
• Perquè tinc mal de cap, avui no treballo gaire.

These are possible, but the original sentence sounds very natural and neutral.

Putting avui at the beginning is common when you want to frame the sentence with today first.

Avui means today, and here it sets the time for the whole sentence.

It does not have to go at the beginning, but that is a very common placement.

Possible positions:

• Avui no treballo gaire...
• No treballo gaire avui...

Both are correct. Beginning position often feels slightly more natural when the speaker wants to establish the time immediately.

The accent in perquè shows the stressed syllable and distinguishes it from similar spellings.

It is stressed on the last part: per-QUÈ.

The grave accent on è marks it as an open e in standard pronunciation.

So the accent is important both for pronunciation and for distinguishing meaning/spelling from related forms like per que or per què.

It can mean either one, depending on context.

Catalan present tense often covers both:

• I work
• I am working

So:

• Avui no treballo gaire can mean Today I’m not working much or Today I don’t work much, depending on the situation.

Usually the surrounding context tells you which reading is intended. In this sentence, because of avui and perquè tinc mal de cap, English will often prefer Today I’m not working much because I have a headache, but the Catalan form itself is just the normal present tense.