Fret buzz is one of the most common reasons people bring a guitar in — that annoying rattle or sitar-like sound when a note doesn't ring cleanly. The good news is it's almost always fixable, and understanding what causes it helps you decide whether it's a quick adjustment or something that needs a tech. Here's how to work out what's going on.
What is fret buzz?
Fret buzz happens when a vibrating string touches a fret it isn't supposed to, instead of ringing freely above it. That contact produces the buzzing or rattling you hear. The trick to fixing it is working out where on the neck it's happening, because the location tells you the likely cause.
The main causes
1. Action set too low
The most common cause. If the strings sit too close to the frets, they don't have room to vibrate and will buzz, particularly when you play harder. Lowering the action improves playability up to a point — go too far and buzz creeps in. The sweet spot is different for every guitar and every player's touch.
2. Not enough neck relief
Guitar necks aren't dead straight — they have a tiny amount of forward curve, called relief, controlled by the truss rod. If the neck is too straight or bowed backwards, the strings will buzz, typically in the lower and middle frets. A small truss rod adjustment often sorts this.
3. Uneven or worn frets
Over years of playing, frets wear down — and they don't wear evenly. If one fret is even slightly higher than its neighbours, the string rattles against it. This shows up as buzz in one specific spot rather than across the whole neck. The fix is a fret level and crown, or in severe cases a re-fret.
4. A nut cut too low
If the buzz happens mainly on open strings but disappears when you fret a note, the nut slots are likely cut too deep. This needs the nut adjusting or replacing.
5. Seasonal change
This catches a lot of people out. Wood expands and contracts with temperature and humidity, so a guitar that played perfectly in summer can develop buzz in winter as the neck moves. It's why an annual setup, or a seasonal tweak, makes such a difference.
How to find where it's coming from
A quick bit of detective work narrows it down:
- Buzz on open strings only, gone when fretted — points to the nut.
- Buzz in the first few frets — usually neck relief (truss rod).
- Buzz in one specific spot up the neck — usually a high or worn fret.
- Buzz everywhere, worse when playing hard — usually action set too low.
What you can fix yourself — and what you can't
A word of caution
Truss rods and nut slots are easy to damage if you're not sure what you're doing — and a cracked nut or over-tightened truss rod costs more to put right than the original buzz. If in doubt, it's cheaper to have it checked than to fix a mistake.
If you're comfortable and have the tools, raising the action slightly or making a small truss rod adjustment is within reach for many players. What needs a tech is anything involving the frets or nut: levelling frets, recrowning them, or cutting nut slots requires specialist tools and a lot of practice to get right. These are precision jobs where a fraction of a millimetre matters.
How a setup fixes buzz for good
A full setup addresses all the common causes in one go — the truss rod, action, nut and frets are all checked and adjusted together, because they interact. Tweaking one in isolation often just moves the problem somewhere else. That's why a proper setup, where everything is balanced against everything else, is usually the lasting fix rather than chasing one cause at a time.
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