Guitar buzz usually comes from one of three places: a fret that sits lower than its neighbors, strings that are too close to the fretboard, or something vibrating loose inside the body
The most common cause is a fret buzz, where one fret is slightly lower than the ones next to it. When you play a note, the string hits that low fret and vibrates against it, creating a buzzing sound instead of a clean tone. This happens gradually as your guitar ages and the wood shifts with temperature and humidity changes.
The second cause is action that is too low — meaning your strings sit too close to the fretboard overall. If every string buzzes across multiple frets, especially in the lower positions, the neck may have lost its curve or the bridge has worn down. The third cause is something inside the guitar body itself: a loose brace, a crack, a loose tuning peg, or even a pick wedged inside.
Identifying which one you have takes a few minutes and a quiet room. Once you know the source, you will know whether you can fix it yourself or need to take the guitar to a technician.
Key Takeaways
- A single fret that sits lower than its neighbors causes buzz on one or two strings in one area of the neck, and a technician can level and crown the frets to fix it.
- If all strings buzz across the lower frets, the action is too low and the bridge or nut may need to be replaced or shimmed.
- Buzzing that happens only when you play hard, or that changes when you move the guitar, usually points to something loose inside the body.
- You can test for fret buzz yourself by sighting down the neck and by playing each string individually, but leveling frets requires specialized tools and should be done by a professional.
How to identify a fret buzz versus low action
Play a single string open (without pressing any fret) and listen. If it buzzes, the action is too low or something is loose in the body. If it rings clean, press down on the first fret, then the second, then the third, moving up the neck. Stop when you hear the buzz start. That fret — or the one just before it — is likely the culprit.
Now do the same on a different string. If the buzz happens at the same fret position on multiple strings, you probably have a low fret. If the buzz happens at different positions on different strings, or if all strings buzz in the lower positions, the action is too low across the whole neck.
You can also sight down the neck like a rifle barrel. Hold the guitar up to a light source and look along the side of the fretboard from the headstock toward the body. A healthy neck has a slight curve — a gentle arc that dips in the middle. If the neck looks perfectly straight or bows backward, the action will be too low and you will get buzz everywhere.
Testing for loose parts inside the guitar body
Hold the guitar body still and gently shake it side to side. Listen for any rattling or buzzing that is separate from the strings. If you hear something moving inside, there is a loose brace, a crack in the wood, or something small trapped in the body.
You can also tap the body gently with your knuckles while listening. A guitar with a loose internal brace will sound dull or buzzy instead of resonant. If you suspect a crack, look through the sound hole with a flashlight. A crack will show as a dark line running across the inside of the body.
Loose tuning pegs also cause buzz. Grab each tuning peg at the headstock and try to wiggle it side to side. If it moves, tighten the small screw at the base of the peg. If the peg itself is cracked or the screw is stripped, you will need to replace it.
When a single fret is the problem
A low fret needs to be leveled and crowned — a process where a technician uses a long straightedge and specialized files to bring all the frets to the same height, then re-crowns each one to its proper shape. This is not a job for a beginner, because one mistake ruins the fretboard.
The cost varies widely depending on how many frets need work and where you live, but expect to pay anywhere from $75 to $200 for a partial fret leveling on an acoustic or electric guitar. A full fret job on a valuable instrument can cost more. Before you pay, ask the technician whether they can identify the exact fret causing the problem — a good technician will show you which one it is.
Some players try to fix a low fret by shimming the neck — inserting a thin piece of wood or plastic under the neck at the body to tilt it slightly and raise the action. This works only if the low fret is in the first few positions and the rest of the neck is straight. It does not fix the fret itself, so the buzz will return if you lower the action again later.
Fixing low action across the whole neck
If all your strings buzz in the lower positions, the bridge has likely worn down or the nut is too low. On an acoustic guitar, the bridge is glued to the top and cannot be adjusted — it has to be replaced or shimmed. On an electric guitar, many bridges have adjustable saddles that you can raise by turning screws or loosening and re-seating the saddle.
Check your guitar's manual or search online for the specific model to see whether your bridge is adjustable. If it is, you can raise the saddle yourself by small increments — usually a quarter turn at a time — and test the buzz after each adjustment. Raise it until the buzz stops, then raise it a tiny bit more so the strings do not buzz when you play hard.
If the bridge is not adjustable or if raising it does not solve the problem, the nut may be too low. The nut is the small piece of bone or plastic at the headstock where the strings rest. Replacing a nut requires removing the strings and carefully fitting a new one, and it should be done by a technician. A new nut costs $30 to $100 depending on the guitar.
Humidity and temperature changes that cause buzz
Wood expands and contracts with humidity. In winter, when the air is dry, the wood shrinks and the neck can lose its curve, causing the action to drop and buzz to appear. In summer, the wood swells and the neck can bow forward, raising the action and sometimes causing the strings to feel stiff.
If your guitar buzzes only in winter or only in one season, humidity is likely the cause. Keep your guitar in a room where the humidity stays between 45 and 55 percent. A small humidifier in the room, or a humidifier pack inside the guitar case, can help. Do not leave the guitar in a car, near a heater, or in direct sunlight, as rapid temperature swings make the problem worse.
If you have already adjusted the action and the buzz returns with the seasons, the neck may have developed a permanent warp. A technician can assess whether the neck can be straightened or whether it needs to be replaced.
When to take your guitar to a technician
Take your guitar to a technician if the buzz is in a single fret position, if you see a visible crack in the body, if the neck looks bowed or twisted, or if you cannot identify the source of the buzz after testing it yourself. A good technician will diagnose the problem in minutes and tell you whether it can be fixed and what it will cost.
Before you go, write down exactly when the buzz happens — on which strings, at which frets, and whether it gets worse when you play hard or when the weather changes. This information helps the technician narrow down the cause quickly.
If you are handy and want to try adjusting the bridge saddle yourself, start with very small changes and test after each one. If you are not confident, or if the guitar is valuable or vintage, let a professional handle it. A small mistake can make the problem worse and cost more to fix.
Frequently Asked Questions
Can I fix a buzzing guitar by adjusting the truss rod myself?
The truss rod adjusts the curve of the neck, and turning it the wrong way can crack the neck or make the buzz worse. Unless you have done this before on the same model, have a technician do it. Even a quarter turn in the wrong direction can cause damage.
Why does my guitar buzz only when I play hard?
When you play hard, the string vibrates with more energy and hits the fret more forcefully. If the action is borderline low or a fret is slightly out of place, you will only hear the buzz on hard attacks. Raising the action slightly or leveling the fret will fix it.
Is a buzzing guitar still playable?
Yes, but it sounds bad and the buzz gets worse over time as the wood continues to shift. If the buzz is mild and only happens in one position, you can play it, but fixing it sooner is cheaper than waiting for the problem to spread to more frets.
How much does it cost to fix a buzzing guitar?
A bridge adjustment on an electric guitar costs $20 to $50. A fret leveling costs $75 to $200. A new nut costs $30 to $100. A new bridge on an acoustic costs $100 to $300. Prices vary by location and the guitar's value.
Can humidity cause permanent buzz?
Humidity causes temporary buzz that comes and goes with the seasons. If the buzz stays even when humidity is normal, the neck has likely warped permanently and needs professional repair or replacement.