Learn Italian: Ho la febbre. Ce l'hai un'aspirina? - I have a fever. Do you have an aspirin on you?

While hai un'aspirina? is grammatically correct, ce l'hai comes from the colloquial verb averci. Italians use this in spoken language to emphasize possessing something or having it "on you" right at that moment. The ce doesn't translate directly; it just acts as an intensifier for the verb avere.

Why is there an l' in ce l'hai if the object (un'aspirina) is already stated right after?

This is a classic feature of spoken Italian! When using averci, Italians frequently include a direct object pronoun (the l', meaning "it") even if they name the actual object right afterward. It makes the sentence sound more spontaneous, almost as if you are asking, "Do you have it on you, an aspirin?"

In ce l'hai, does the l' stand for lo or la here?

It stands for the feminine pronoun la, because it refers to un'aspirina. As a quick refresher: both lo (masculine "it") and la (feminine "it") drop their vowel and become l' when placed before forms of avere that start with an h.

Why does it say la febbre instead of una febbre?