Spelling the word: what it actually takes
The word is excesso. One S in the middle, two C's before the final O. It comes from Latin excessus, which is where most of the confusion happens if you're relying on intuition rather than knowing the root. I spent three days last year going through a batch of Portuguese-language submissions for a project, and the most common error wasn't even grammatical — it was people writing excesso with an X and then switching it around when they caught themselves. You see it constantly: execesso, excceso, excesse. The brain tries to fix things that aren't broken because the word doesn't sound like it's spelled. That's the trap.
como se escreve excesso
It's E-X-C-E-S-S-O. Not E-X-C-E-S-O. The double S matters. If you remove one, you've got exceso, which doesn't exist in Portuguese. A lot of people drop one S because in rapid speech the distinction between a single and double consonant almost disappears. But writing it down, you need both. Here's a trick that actually works: break it into syllables — ex-ces-so. The stressed syllable is ces, and that's where the double S anchors itself. If you stress that middle part, the spelling becomes more obvious to anyone who's paying attention to how the word lands when spoken slowly.
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Another thing nobody mentions: excessivo follows the same pattern. Ex-ces-si-vo. Same double S, just extended. Excessivamente is the adverb, and yes, it's still two S's. People regularly write excessivamente as execessivamente with an X, which is doubly wrong — both the initial X and the missing S. The real issue is that Portuguese speakers tend to default to X for the // sound in many contexts — think telefone, taxi, texto — so when they hear "excesso," their fingers reach for X instead of SS. It's a muscle memory problem, not a knowledge problem. The workaround I use now is to always check the noun form against the adjective. If it's excessivo, then excesso is definitely correct. Cross-referencing related forms catches about 90% of these errors before they make it into anything final.
There's also the variant excessão, which is incorrect but appears in older texts and in regions where Spanish influence is stronger. In European Portuguese, you might see it more often simply because Spanish exceso has only one S. If you're editing for a Brazilian audience, flag it immediately. For a Portuguese audience, it's worth noting but not necessarily correcting unless it's formal writing. The only time you should ever write excesso with an X is if you're intentionally misspelling it for stylistic reasons in creative writing. Otherwise, it's always double S. Always.