A hyphen joins two or more words that are working together as a single description in front of a noun — “a well-designed study” — and you drop it the moment those same words land after the noun: “the study was well designed.” That one rule fixes most of the hyphen mistakes we see in manuscripts.
It sounds small. It isn’t. Reviewers read hyphenation as a proxy for care, and in a few cases a missing or misplaced hyphen genuinely changes what the sentence says. Here’s the rule, the one exception that catches almost everyone, and a trap that’s specific to methods sections.
The rule: hyphenate before the noun, not after
When two or more words act as a single adjective sitting in front of a noun, hyphenate them so the reader parses them as one unit:
- a double-blind trial
- a case-control study
- a long-term follow-up
- a state-of-the-art assay
Move the same description after the noun it modifies, and the hyphen usually comes out: “the trial was double blind,” “the follow-up was long term.” The words are no longer standing in front of a noun as a single unit, so there’s nothing left to join.
The exception almost everyone trips on: -ly adverbs
If the first word is an adverb ending in -ly, never hyphenate it, even when it’s sitting right before the noun it modifies:
Wrong: “the randomly-selected participants,” “a highly-cited paper.”
Right: “the randomly selected participants,” “a highly cited paper.”
The logic: an -ly adverb can only modify the word right next to it, so there’s no ambiguity for the hyphen to resolve — it’s only doing decorative work, and academic style guides ask you to leave it out. This is the single most common hyphen error we correct in edited manuscripts, usually because it looks tidier with the hyphen in. It isn’t.
The trap that’s specific to methods sections
A hyphen on a re- verb can change what actually happened in your experiment. Compare:
“We recreated the original conditions” (we had a nice afternoon reproducing them, informally) versus “We re-created the original conditions” (we built them again, precisely, as a controlled step in the protocol).
Same pattern with re-form vs. reform, re-sign vs. resign, re-cover vs. recover. Whenever a re- prefix could plausibly be read two ways, the hyphen is what tells the reader which one you mean — this is one of the few places a hyphen carries real information rather than just tidying up a compound adjective.
The quick test
Before a noun, ask: are these words only meaningful together, as one description? If yes, hyphenate — unless the first word ends in -ly, in which case, don’t. After the noun, the hyphen almost always comes off. That’s the rule in one line, and it’s worth having in your head the next time you type “well established” in front of a noun.
Writing Tip 2 on the main site walks through a few more cases — suspended hyphens in a series (“third- and fourth-grade teachers”), hyphenating spelled-out numbers, and prefixes before capitalized words — if you want the fuller reference.
Watch it in three minutes
If it’s easier to see worked through than read, this video covers the three main uses of the hyphen in academic English with more examples than fit here:
There’s also a companion video specifically on hyphens with compound adjectives, and how getting the hyphen wrong changes the meaning of the sentence, if that’s the part you keep second-guessing.
The full punctuation chapter — hyphens, dashes, commas, and the rest — is written out in Chapter 6 of our book, How to Fix Your Academic English and Publish Your Research Faster, if you’d rather have the whole reference in one place instead of hunting through style guides mid-draft.
What we actually catch
In practice, hyphen slips rarely travel alone — they tend to show up alongside article errors, tense drift across a methods section, and the kind of phrasing that’s clear to the writer but not to a reviewer three time zones away. That’s the level of detail our editing service is built to catch, line by line, before a journal ever sees it.
If you’d rather have small, fixable things like this land in your inbox before they land in your draft, our writing and publication emails cover one point like this at a time.
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