El humo provoca tos.

In Spanish, general statements often use the definite article where English does not.

So el humo literally looks like the smoke, but here it means smoke in general.

Compare:

• El humo provoca tos. = Smoke causes coughing.
• El tabaco es caro. = Tobacco is expensive.
• La leche es buena para... = Milk is good for...

This is very common in Spanish.

Because humo is a masculine noun: el humo.

There is not always a logical reason for grammatical gender, so this is something you usually just learn with the noun. A useful habit is to learn nouns together with their article:

• el humo
• la tos

Even though humo ends in -o, which often suggests masculine, the safest approach is still to memorize the full form.

Provoca is the third-person singular form of provocar, meaning to cause, to provoke, or to bring on, depending on context.

Here it means:

• provoca = causes

So:

• El humo provoca tos. = Smoke causes coughing.

Other examples:

• El frío provoca dolor. = The cold causes pain.
• Eso provoca problemas. = That causes problems.

Because the subject is el humo, which is singular.

• el humo = singular
• therefore the verb must also be singular: provoca

If the subject were plural, the verb would change:

• Los humos provocan tos. = The fumes cause coughing.

So the agreement is:

• singular subject → provoca
• plural subject → provocan

In this sentence, tos is being used in a general, uncountable way, so Spanish often leaves out the article.

• provoca tos = causes coughing / causes a cough

This sounds natural when talking about symptoms or effects in a general sense.

You may also see la tos, but that usually sounds more specific:

• provoca la tos could suggest it causes the cough or refer to coughing as a more defined condition.

So in a general health statement, provoca tos is the most natural choice.

It is singular.

La tos means cough or coughing. In this sentence it is being used as a general noun, more like coughing in English.

So:

• tos = singular noun
• not plural toses

Even without the article, it is still singular.

The h in Spanish is silent, so humo is pronounced roughly like OO-mo.

A simple pronunciation guide:

• el → el
• humo → OO-mo
• provoca → pro-BO-ka
• tos → tos

In Spain, the c in provoca is pronounced like the th in thin, because it comes before a? Actually, no: before a, o, and u, c is a hard k sound. So provoca ends with -ka, not -tha.

Yes. Causar and provocar can both work here.

• El humo provoca tos.
• El humo causa tos.

Both mean Smoke causes coughing.

A small nuance:

• causar is often a bit more neutral and direct: to cause
• provocar can sometimes feel like to bring on or to trigger

But in this sentence, both are natural.

The normal and most natural order is:

• El humo provoca tos.

Spanish word order is often flexible, but Tos provoca el humo sounds unnatural here.

Why? Because Spanish usually puts the subject first in a simple statement, especially in neutral, everyday language:

• subject: El humo
• verb: provoca
• object: tos

So for a learner, the best pattern to follow is:

subject + verb + object

It normally refers to smoke in general.

Because of the structure El + noun in a general statement, el humo here means smoke as a substance or smoke in general, not necessarily one specific cloud of smoke.

If you wanted a more clearly specific meaning, the context would usually make that obvious:

• El humo de la cocina provoca tos. = The smoke from the kitchen causes coughing.

Without extra context, El humo provoca tos is understood as a general truth.

It is capitalized only because it is the first word of the sentence.

Normally, the article is lowercase:

• el humo
• la tos

At the beginning of a sentence, it becomes:

• El humo provoca tos.