What is hand-arm vibration syndrome (HAVS)?
HAVS is one of the most common, and most preventable, occupational diseases in trades that use powered hand tools. This guide explains what it is, how to recognise it early, the exposure values that drive what you must do, the control duties on employers, and how health surveillance works.
The condition
Hand-arm vibration syndrome is caused by regular, prolonged exposure to vibration passed into the hands and arms from powered tools and hand-guided machinery, grinders, breakers, needle scalers, sanders, impact wrenches, chainsaws and the like. It has three types of effect that often overlap: vascular (damage to blood vessels, causing blanching), neurological (nerve damage, causing numbness and tingling) and musculoskeletal (affecting muscles, joints and grip). Once established, the damage can be permanent or largely irreversible, which is why the whole system of duties is aimed at prevention rather than cure.
Why magnitude and duration both matter
How much vibration a worker actually receives depends on two things together: the magnitude of vibration a tool produces (how "shaky" it is, in m/sĀ²) and the duration for which it is used (the "trigger time", how long the tool is actually in contact and working, not how long the shift is). A high-vibration tool used briefly and a lower-vibration tool used for hours can carry similar risk. This is why exposure is expressed as a combined daily figure, and why simply swapping to a "low-vibration" tool does not remove the risk if it is then used for much longer.
The exposure values: EAV and ELV
The Control of Vibration at Work Regulations 2005 (Great Britain; the Control of Vibration at Work Regulations (Northern Ireland) 2005 in Northern Ireland) set two daily thresholds, both expressed as A(8), exposure averaged over, and normalised to, an eight-hour day:
- ā¢Exposure action value (EAV), 2.5 m/sĀ² A(8): the level at which you must take action. At or above it, you must assess and reduce exposure so far as is reasonably practicable and provide health surveillance for workers who are at risk.
- ā¢Exposure limit value (ELV), 5 m/sĀ² A(8): an absolute ceiling that must not be exceeded on any day. If a worker would reach it, exposure has to be reduced before they continue.
In plain terms: the EAV is the trigger to act; the ELV is a line you must not cross. Both combine tool magnitude with trigger time, so a single high-vibration tool can take a worker to the action value in well under an hour.
Estimating where a job falls
You can estimate a worker's likely daily exposure with our free HAVS exposure calculator, which uses the HSE exposure-points method. Treat any calculator result as an estimate based on the tool magnitudes and trigger times you enter, not a guarantee of safe exposure or a substitute for measuring or managing the real risk on site, the actual vibration a worker receives varies with the tool's condition, the task, the consumable and the individual.
The employer's control duties
Where workers are exposed to vibration, the employer must assess the risk, and eliminate or reduce exposure so far as is reasonably practicable using the hierarchy of control. That means, in order: removing the need for the vibrating process where possible; substituting lower-vibration tools and methods; and then reducing exposure through better equipment, maintenance and how the work is organised. Health surveillance, together with information, instruction and training, sits alongside these as part of the system, not instead of controlling exposure.
Exposure controls in practice
Practical controls include selecting genuinely lower-vibration tools for the task, keeping tools and consumables well maintained (a blunt disc or worn tool vibrates more), using the right tool for the job so it is not forced, keeping workers warm and dry (cold worsens vascular symptoms), and designing the work to reduce total trigger time. Job rotation and trigger-time limits can help spread exposure, but they are not a universal fix: rotation only helps if the people it rotates to are not themselves pushed over the action value, and a trigger-time "limit" is only meaningful if it is actually enforced and based on the real magnitude of the tools in use. Controlling exposure at source is always better than rationing time on a harmful tool.
Health surveillance and who should be in it
Health surveillance for vibration is required where workers are likely to be regularly exposed above the EAV despite control action, or are otherwise particularly at risk. Its purpose is to detect the early signs of HAVS and carpal tunnel syndrome so that action can be taken before the damage becomes disabling. It is risk-based and selective, not everyone who ever picks up a tool needs it, see when is health surveillance required. The surveillance itself is carried out by competent occupational-health professionals, not by the employer or by software.
The HSE tiered system
HSE describes a tiered approach to vibration health surveillance, escalating only as far as an individual's results require:
| Tier | What it involves |
|---|---|
| Tier 1 | A short baseline questionnaire when someone starts work with vibrating tools. |
| Tier 2 | A short annual screening questionnaire, administered by a responsible person. |
| Tier 3 | Assessment by a qualified person (typically an occupational-health nurse) where screening flags symptoms. |
| Tier 4 | Formal diagnosis and assessment by a doctor with the relevant occupational-health competence. |
| Tier 5 | Optional standardised tests used to help assessment where needed. |
Symptoms and early reporting
Because HAVS develops gradually, early reporting is one of the most valuable controls a workforce has. Workers should be told what the early signs are, tingling, numbness, loss of dexterity or grip, and blanching fingertips in the cold, and encouraged to report them promptly rather than working through them. A culture where symptoms are reported early, and acted on, is what stops a reversible early warning turning into permanent damage.
What to do when surveillance finds a problem
If surveillance identifies possible HAVS, the employer should review that worker's exposure and the controls, obtain occupational-health advice, consider adjustments or restrictions, and check whether other similarly exposed workers may be affected. Certain diagnosed cases can also be reportable under RIDDOR, so check the reporting duties. The point of surveillance is to trigger action, not simply to file a result.
Great Britain and Northern Ireland
The exposure values and duties above apply in Great Britain under the Control of Vibration at Work Regulations 2005. Northern Ireland has its own equivalent, the Control of Vibration at Work Regulations (Northern Ireland) 2005, enforced by HSENI. The approach is the same, but cite the correct jurisdiction.
Manage vibration exposure and surveillance records
Complys keeps your hand-arm vibration assessments and exposure records together, and tracks the health-surveillance recalls those exposures require, with reminders and an audit trail. The surveillance and any diagnosis are carried out by occupational-health professionals; Complys does not diagnose HAVS, measure tool vibration for you, or decide safe exposure, it holds the records and the schedule.
FAQs
What is HAVS?
Hand-arm vibration syndrome (HAVS) is a group of conditions caused by regular, prolonged exposure to vibration transmitted into the hands and arms, typically from powered hand tools and hand-guided machinery. It affects the blood vessels, nerves, muscles and joints of the hand and arm, and once established the damage can be permanent or largely irreversible, so it is best tackled by prevention.
What are the exposure action and limit values?
Under the Control of Vibration at Work Regulations 2005, the exposure action value (EAV) is 2.5 m/sĀ² A(8), at or above it you must take action to control exposure and provide health surveillance where workers are at risk, and the exposure limit value (ELV) is 5 m/sĀ² A(8), which must not be exceeded in a day. A(8) means daily exposure normalised to eight hours, combining how much vibration a tool produces (magnitude) with how long it is used (duration).
What are the first symptoms of HAVS?
Early signs include tingling and numbness in the fingers, loss of grip strength and dexterity, and fingertips going white (blanching) on exposure to cold, 'vibration white finger'. Symptoms build gradually and are easy to miss, which is why early reporting and health surveillance matter.
Is HAVS reversible?
Caught very early, some symptoms may improve if exposure is reduced. Established HAVS is generally considered permanent or largely irreversible, so the goal is to prevent it developing rather than to treat it after the fact.
Which regulations cover it?
In Great Britain, the Control of Vibration at Work Regulations 2005; in Northern Ireland, the Control of Vibration at Work Regulations (Northern Ireland) 2005.
Related: noise at work action values, when is health surveillance required, what is a risk assessment, and the HAVS calculator. General information, not legal or medical advice.