Guitar buzz usually comes from one of three places: the strings are too close to the frets, the frets themselves are uneven, or something is vibrating loose inside the body

The most common cause is fret buzz—when a string vibrates against a fret it shouldn't touch. This happens because the neck has lost its curve, the strings are set too low, or a single fret has risen above its neighbors. You'll hear it as a metallic rattle or buzz on certain notes or frets, usually when you play hard.

The second source is loose hardware or internal vibration. A tuning peg, bridge, strap button, or something inside the body can rattle when the strings vibrate. This buzz sounds different—more like a rattle than a metallic ring—and it happens across many notes rather than on specific frets.

The third cause is worn or damaged strings. Old strings lose their smoothness and can buzz against frets or the nut (the bone or plastic piece at the headstock where strings sit). This is the easiest fix: new strings often solve it.

Key Takeaways

  • Fret buzz—a metallic rattle on specific notes—usually means the neck has straightened too much or the strings sit too low, and often requires a truss rod adjustment or bridge height change.
  • A rattling buzz that happens across many notes usually points to loose tuning pegs, bridge parts, strap buttons, or something vibrating inside the body.
  • New strings sometimes stop buzz on their own, especially if the old ones are worn or damaged.
  • Small adjustments like raising the bridge or tightening hardware can fix many buzzes at home; uneven frets or serious neck problems need a professional setup.

How to tell whether it's fret buzz or something else

Play a single string open (without pressing any frets). If you hear buzz, it's not fret buzz—it's loose hardware or internal vibration. Fret buzz only happens when you press down on a fret, because the string has to be close enough to touch the fret below it.

Now play the same string while pressing down on different frets, one at a time. If the buzz happens on only a few frets or in one area of the neck, it's fret buzz. If the buzz is everywhere or sounds like a rattle rather than a metallic ring, look for loose parts.

Listen carefully to where the sound comes from. Fret buzz comes from the strings and frets themselves. Loose hardware buzz often comes from the headstock (tuning pegs), the bridge area, or somewhere inside the body.

Fixing fret buzz from low action or a straight neck

The most common fret buzz happens because the strings are too close to the frets. This is called low action. A healthy guitar neck has a slight curve—a tiny amount of relief—so strings sit at a safe distance from the frets. Over time, humidity changes, string tension, and normal wear can flatten that curve.

The first step is to check the neck's curve yourself. Place a straightedge (a ruler or the edge of a level) along the frets from the headstock toward the body. Look for light underneath the straightedge. If the neck is perfectly flat or curves backward (toward the body), the strings will buzz. If there's a small gap under the straightedge at the middle of the neck, the curve is probably fine.

If the neck is too flat, the truss rod—a metal rod inside the neck—can restore the curve. Turn the truss rod nut clockwise (when looking at the headstock) by a quarter turn, then wait 24 hours and check again. This is a slow, careful process. If you're not confident, a professional setup is worth the cost; an incorrect truss rod adjustment can damage the neck.

If the neck curve looks normal but the buzz persists, the strings may straightforward be too low. Raise the bridge slightly—usually by 1/32 inch at a time—and check if the buzz stops. On acoustic guitars, this means a new bridge saddle (the white or bone piece on top of the bridge). On electric guitars with adjustable bridges, you can usually turn screws or move saddles up.

Fixing buzz from uneven frets

If only one or two frets buzz, or if raising the bridge doesn't help, a single fret may be higher than its neighbors. This is harder to fix at home. You can try tapping the fret gently with a rubber mallet to see if it's loose, but uneven frets usually need a professional fret leveling—a process where a luthier (guitar repair person) sands the frets flat and then re-crowns them to restore their shape.

Fret leveling is not cheap, but it's a permanent fix. If your guitar is old or inexpensive, the cost may not be worth it. If the buzz is only on one or two notes and doesn't bother you, you can live with it. But if it affects your playing, a professional setup is the real solution.

Finding and tightening loose hardware

If the buzz sounds like a rattle and happens across many notes, start by checking the tuning pegs. Grab each one and try to wiggle it side to side. If it moves, tighten the screw or bolt that holds it to the headstock. Use a screwdriver or wrench that fits snugly—a loose tool can strip the screw.

Next, check the bridge. On an acoustic guitar, the bridge is glued down, but the saddle (the piece the strings rest on) can sometimes shift. On an electric guitar with a tremolo arm or adjustable bridge, make sure all the bridge screws and saddle locks are tight. Tighten them gently—over-tightening can crack the bridge or strip screws.

Check the strap buttons (the pegs where the strap attaches). Grab the strap and wiggle it. If a button moves, tighten its screw. Also look for any loose pickguard screws, loose output jack hardware, or loose battery compartment covers if your guitar is electric.

If you've tightened everything and the buzz persists, something inside the body may be loose—a brace, a piece of binding, or a part of the internal structure. This requires opening the guitar, which is a job for a professional unless you have experience.

When to replace the strings

Old strings lose their brightness and can develop flat spots or rough patches where they've been pressed against frets. These worn spots can cause buzz. If your strings are more than a few months old and you play regularly, or if they look dull or discolored, new strings are worth trying.

New strings also sit differently on the nut and bridge, so they may reduce buzz even if the strings themselves weren't the main problem. Change all six strings at once so they age together and stay in tune better.

After installing new strings, expect them to go out of tune quickly for the first day or two. Stretch them gently by pulling up on each string near the middle of the neck, then retune. This helps them settle faster.

When to see a professional

If the buzz persists after you've tightened hardware and replaced the strings, or if you're not comfortable adjusting the truss rod or bridge, a professional setup is the next step. A luthier or experienced guitar technician can diagnose the exact cause in minutes and fix it properly.

A full setup usually includes truss rod adjustment, bridge height adjustment, nut work if needed, and fret leveling if the frets are uneven. The cost varies widely—anywhere from $50 to $200 depending on what's needed and where you live. For an expensive or sentimental guitar, it's money well spent. For a cheap beginner guitar, you may decide to live with minor buzz or replace the guitar instead.

Frequently Asked Questions

Is fret buzz bad for my guitar?

Fret buzz doesn't damage the guitar itself, but it can affect how the guitar sounds and plays. If the buzz is mild and only on a few notes, many players ignore it. If it's loud or widespread, it makes the guitar harder to play and sounds worse when recorded.

Can humidity cause buzz?

Yes. Dry air shrinks the wood in the neck, which can flatten the curve and cause buzz. Humid air swells the wood and can increase the curve. Keep your guitar in a room with stable humidity—ideally between 45 and 55 percent—and store it in a case to buffer humidity changes.

Why does my guitar only buzz when I play hard?

When you play softly, the string vibrates in a smaller arc and may not touch the fret. When you play hard, the string vibrates more and hits the fret. This is a sign the action is borderline low. Raising the bridge slightly usually fixes it.

Can I fix fret buzz by adjusting the bridge saddle?

Yes, if the buzz is from low action. Raising the saddle lifts all the strings equally and usually stops buzz caused by strings sitting too close to the frets. If the buzz is from an uneven fret or a straight neck, raising the saddle will help but may not solve it completely.

What's the difference between fret buzz and a rattling sound?

Fret buzz is a metallic ring or rattle that happens when a vibrating string touches a fret it shouldn't. A rattling sound is usually loose hardware or something vibrating inside the body. They sound different and have different causes, so identifying which one you have is the first step to fixing it.