Ergonomic Hazards: Types, Examples and How to Control Them at Work

What are ergonomic hazards?

Ergonomic hazards are the parts of a job that put physical strain on the body: how hard a worker has to push or grip, how often they repeat a motion, how they hold their body, and what they touch, hold or ride on. Over time these exposures cause musculoskeletal disorders (MSDs), such as back injuries, tendinitis and carpal tunnel syndrome.

OSHA describes ergonomics as "fitting a job to a person" (OSHA). An ergonomic hazard is a place where the job does not fit, so the person has to adapt with their back, shoulders or wrists.

This post covers the causes. If you want the outcome side (symptoms, statistics and the conditions themselves), read our guide to work-related musculoskeletal disorders. To screen a real job against these hazards, use the free ergonomic assessment checklist.

What are the main types of ergonomic hazards?

OSHA's risk factor list names six physical hazards: excessive force, repetition, awkward or sustained postures, localized pressure (contact stress), cold and vibration. It adds a seventh point that matters in practice: combined exposure to several risk factors raises the risk more than any one alone.

HSE adds two broader groups. Risk can come from the work environment, including temperature and lighting, and from work organisation, including work pressure, job demands and a lack of breaks (HSE). Workstation design sits underneath most of the physical factors, because a badly placed bench or screen is what creates the awkward posture in the first place.

The table below sets out the types of ergonomic hazards with typical examples from offices and from industrial sites.

Hazard type	What it means	Office example	Industrial example
Force	Muscle effort to lift, push, pull, grip or control a tool	Carrying boxes of paper or moving furniture	Lifting heavy cases, pushing loaded carts, controlling a heavy tool
Repetition	The same motion done often, for long periods	Hours of mouse clicking and data entry	Packing, assembly line work, high-volume item picking
Awkward posture	Joints near the end of their range	Twisting toward a side monitor, reaching for a mouse placed too far away	Reaching above shoulder height, kneeling, cutting with bent wrists, twisting while lifting
Static posture	Holding one position with little movement	Sitting for long stretches with shoulders raised to a high desk	Standing in one spot all shift, holding a tool overhead
Contact stress	Pressure from hard or sharp edges	Wrists or forearms resting on a hard desk edge	Gripping hard tool handles, using the hand as a hammer, kneeling on concrete
Vibration	Whole-body or hand-arm vibration	Rarely a factor	Grinders, hammer drills, chainsaws; driving forklifts or trucks over rough floors
Cold	Cold air or cold materials, combined with other factors	Rarely a main driver	Cold storage, meat and poultry processing, outdoor winter work
Workstation design	Heights, reaches and layout that force poor postures	Desk, chair and monitor heights that don't fit the user	Work tables that force long reaches, pallets on the floor
Work organisation	Pace, quotas, breaks, job demands	Deadlines with no breaks, long uninterrupted screen sessions	Machine-paced lines, pick-rate quotas, no rotation

What are some ergonomic hazards examples by type?

The descriptions below draw on OSHA, CCOHS and HSE guidance. They are the details that help you recognise each factor on the floor.

Force

CCOHS defines force as the effort the body makes to lift objects, use tools or move (CCOHS). More force means more muscular effort and a longer recovery time between tasks.

The same load can need very different force. Holding a box away from the body, or gripping it in a pinch instead of a hook grip, takes more effort. Tool condition matters too: CCOHS notes that a worn screwdriver, worn pliers or dull scissors can increase the operating force by tenfold.

For lifting tasks, the NIOSH lifting calculator shows how load position and lift frequency change the recommended weight limit.

Repetition and pace

Repetition is hazardous when the same joints and muscles move too often, too quickly and for too long. CCOHS points out that workers can't fully recover in the short gaps between movements, so fatigue builds and injuries follow.

Pace is the hidden multiplier. The faster the pace, the less recovery time there is. When the line speed or a quota sets the pace, CCOHS says stress levels rise, which adds muscle tension and more risk.

Awkward and static postures

Awkward postures put joints near the end of their range, which stretches and compresses tendons and nerves. Examples include bending or twisting the torso, reaching above shoulder level or behind the body, and bending the wrist.

Static posture is the less obvious version. CCOHS explains that any controlled arm movement keeps the neck and shoulder muscles contracted for as long as the task lasts, which restricts blood flow and speeds fatigue even with little visible movement. Long periods of standing in one place can cause sore feet, general fatigue and lower back pain.

Contact stress

OSHA calls this localized pressure: pressing the body against hard or sharp edges, or using the hand as a hammer. In offices, the usual case is a forearm or wrist resting on a sharp desk edge. In industry, it is hard or narrow tool handles, knee contact on concrete and striking parts into place with the palm.

Vibration

Workers can be exposed to whole-body vibration, as truck and bus drivers are, or to localized hand-arm vibration from power tools. OSHA explains that hand-arm vibration can reduce feeling in the hands, so workers grip harder to control the tool. Vibration therefore adds force on top of its own direct effects.

Cold and the thermal environment

Cold works mainly as an amplifier. OSHA notes cold temperatures combined with other risk factors may increase the potential for MSDs, and gives meatpacking and poultry processing as examples. CCOHS adds that numb hands misjudge force and use too much, and a cold body is less flexible. Heat and humidity also make workers tire more quickly.

Workstation design and work organisation

Many physical factors start with design. A work table placed too far away creates the reach, and a low pallet creates the stoop. That's why OSHA's top solutions include repositioning work tables and redirecting conveyors toward the worker.

Work organisation covers pace, quotas, job demands and breaks. HSE and CCOHS both note that stress and other psychosocial factors can contribute to MSDs, partly through extra muscle tension.

How do you identify ergonomic hazards in the workplace?

OSHA recommends combining two approaches (OSHA):

1. Review the records. Check OSHA 300 logs, 301 reports, workers' compensation records, first aid logs, near-miss reports and worker reports of problems.
2. Look ahead. Observe the work, run ergonomic job analyses, survey workers and interview them, so you catch ergonomic hazards in the workplace before anyone is hurt.

OSHA also lists warning behaviours worth noticing. These include workers modifying their own tools or work area, shaking out their arms and hands, rolling their shoulders, or bringing back belts or wrist braces to work.

Teach crews these early signals too. The toolbox talk on spotting early signs of strain is a five-minute way to do it. HSE notes that people with MSDs usually recover completely if the problem is recognised early and treated appropriately.

Once you know which jobs are a problem, a structured assessment tells you how big the risk is. Our guide on how an ergonomic assessment works covers the process, and our comparison of ergonomic risk assessment tools helps you pick a method for each task. For whole-body postures, a REBA posture score is a common choice.

If filming the task is easier than scoring it by hand, ViveLab's AI posture analysis estimates a REBA or RULA score from a phone video, with processing done on your device. Treat the result as an estimate for a trained assessor to review.

How do you control ergonomic hazards?

NIOSH's hierarchy of controls sets out five levels in order of general effectiveness: elimination, substitution, engineering controls, administrative controls and PPE. OSHA applies the same logic to ergonomics: engineering controls are the most desirable where possible, and personal protection has only limited effectiveness (OSHA).

Eliminate or substitute

Remove the hazardous task, or replace it with a safer one. NIOSH notes that these options are easiest at the design stage, or when you choose new equipment or procedures. Examples include having loads delivered at working height instead of on the floor, or buying a lighter version of a product or container.

Engineering controls

These change the workplace itself. OSHA's examples:

• Use a device to lift and reposition heavy objects.
• Reduce the weight of the load.
• Reposition a work table to eliminate a long reach and allow neutral postures.
• Use diverging conveyors so tasks are less repetitive.
• Install diverters that bring materials toward the worker.
• Redesign tools to enable neutral postures.

Administrative and work practice controls

These change how the work is organised. OSHA suggests two-person lifts for heavy loads, rotating workers between jobs that use different muscle groups, "floaters" who give extra breaks, and proper tool maintenance. NIOSH adds training, adequate rest breaks and adjusting line speeds.

These controls need ongoing effort from supervisors and workers, so NIOSH recommends them mainly while better controls are being put in place, or where hazards aren't otherwise well controlled.

Personal protective equipment

PPE is the last layer. OSHA's examples include padding to reduce contact with hard, sharp or vibrating surfaces, and well-fitting thermal gloves for cold work. Don't rely on PPE on its own when another control is available.

Check that the control worked

NIOSH recommends training workers on new controls and evaluating them regularly. Re-score the task after a change and ask the people doing it whether it feels easier. A fix that moves the strain to another body part hasn't solved the problem.

This post is general information, not medical advice. Anyone with persistent pain, numbness or tingling should see a clinician.

Next steps

Pick one job with complaints or recent injuries and screen it with the ergonomic assessment checklist to see which risk factors are present. Then use the WMSD guide to explain to your team what those exposures can lead to if they're left unchecked.