HEALTH AT WORK

Workplace Safety

Workplace Anaphylaxis: What Employers Must Do When a Worker Has a Severe Allergic Reaction

17 October 2026 · Health at Work · AI-assisted draft

A worker eats lunch in the canteen, develops a tight throat and collapsing blood pressure within eight minutes, and collapses before anyone realises what is happening. This is not a rare hospital scenario. Anaphylaxis - a rapid, life-threatening allergic reaction - can and does occur in ordinary workplaces, and the difference between survival and death is often measured in how quickly those around the affected person act. Most workplaces are wholly unprepared.

What Anaphylaxis Actually Is, and Why It Happens So Fast

Anaphylaxis is a severe, systemic allergic reaction triggered when the immune system releases a massive wave of chemicals in response to an allergen. Unlike a mild allergic reaction confined to a rash or runny nose, anaphylaxis involves the whole body simultaneously. Histamine and other mediators cause blood vessels to dilate and leak fluid, airways to swell and narrow, and blood pressure to drop. The result is that a person can go from feeling slightly unwell to unconscious and not breathing in under fifteen minutes. Without adrenaline (epinephrine) administered promptly, the reaction can be fatal.

The triggers most commonly encountered in occupational settings include food allergens - particularly nuts, shellfish, eggs and sesame - latex rubber found in gloves and medical equipment, insect stings from bees or wasps encountered by outdoor workers, and certain medications or disinfectants. Some workers are also sensitised through repeated occupational exposure: a healthcare worker who develops latex allergy after years of glove use, or a food processing worker repeatedly exposed to airborne fish protein. Sensitisation happens gradually; the reaction when it occurs can be instant and catastrophic.

Which Workers Are at Greatest Risk

Anaphylaxis risk at work is not confined to a single sector. Healthcare and dental workers face significant latex exposure. Food manufacturing workers handle allergens in dust, aerosol and contact form every shift. Catering staff handle known allergens constantly, sometimes without knowing which dishes contain them. Outdoor workers - landscapers, agricultural workers, construction crews, utility engineers - face stinging insect risk, and a sting that caused only local swelling five years ago may trigger a full systemic reaction if the person has since become sensitised. Cleaning staff handle disinfectants and biocidal agents that can cause reactions in previously sensitised individuals.

A worker with a known allergy - whether disclosed at recruitment or developed during employment - is at elevated risk. But some workers have their first anaphylactic episode at work, with no prior history that would have flagged them as high-risk. This is why preparedness cannot be limited to those with a documented allergy on file.

Recognising the Signs: Early and Late

The early signs of anaphylaxis are often misread as something minor: tingling or itching around the lips or hands, a feeling of warmth spreading across the skin, a slight tightness in the chest, or a sense of unease the person may struggle to describe. Some people report feeling that something is 'very wrong' before they can identify a specific symptom. At this stage, adrenaline administered promptly can halt the reaction entirely.

Within minutes, if untreated, the reaction progresses. The throat tightens, the voice becomes hoarse, swallowing becomes difficult. Hives or flushing may appear across the trunk. Nausea and vomiting are common. Breathing becomes audible - a high-pitched wheeze known as stridor indicates the upper airway is narrowing. Blood pressure drops sharply, causing dizziness, confusion and pale, clammy skin. The person may lose consciousness. In the most severe presentations, the heart rhythm is disrupted. Death from untreated anaphylaxis can occur in under thirty minutes from the onset of symptoms.

A feature that catches people out is the biphasic reaction: symptoms improve, the person feels better, and then a second wave of reaction occurs one to eight hours later, sometimes more severe than the first. This is why any worker who has suffered anaphylaxis must be taken to hospital even if they appear to have recovered.

What Employers Are Required to Do

Under occupational health and safety obligations in most jurisdictions, employers have a legal duty to assess risks to worker health, implement reasonable controls, and ensure adequate first-aid provision. For anaphylaxis, this translates into several specific responsibilities that many employers overlook.

First, risk assessment must identify workers who are known to have severe allergies, the allergens present in the workplace - whether in food, materials, chemical agents or the outdoor environment - and the likelihood and severity of exposure. This is not a one-time exercise: it must be reviewed when tasks change, new materials are introduced, or a worker discloses a new diagnosis.

Second, adrenaline auto-injectors (often referred to by brand names such as EpiPen, though the generic term is simply 'adrenaline auto-injector') must be available in workplaces where the risk assessment identifies a realistic risk of anaphylaxis. In many jurisdictions, employers can now legally hold spare auto-injectors for use in emergencies even where the specific individual has not been prescribed one. The device serves no purpose locked in an office three floors away from where the worker has collapsed: it must be accessible within the time a reaction develops.

Third, trained first aiders must know how to recognise anaphylaxis and how to use an auto-injector. General first-aid training often covers this only briefly. Where the risk is significant, dedicated refresher training on anaphylactic response is appropriate. Training should include recognising the early signs, knowing when to act rather than waiting to be certain, how to position an unconscious casualty, and when to call emergency services.

Fourth, a written emergency action plan specific to anaphylaxis must be in place - not buried in a generic first-aid policy but communicated to supervisors and colleagues of at-risk individuals. This plan should state where the auto-injector is kept, who is trained to administer it, what the call-for-help procedure is, and that emergency services must always be called even when the auto-injector has been used.

Practical Controls That Actually Work

Control measures for anaphylaxis risk follow the same hierarchy as any occupational hazard. Elimination is the most effective: removing the allergen from the workplace entirely where possible. This may mean switching from latex to nitrile gloves across a whole facility rather than only accommodating the worker who already has a known allergy - a change that also prevents future sensitisation among other staff.

Substitution applies wherever an allergen-containing material can be replaced: replacing latex consumables, choosing cleaning agents without known sensitisers, or sourcing allergen-free ingredients for a staff canteen. These changes are permanent protections that do not depend on any individual's vigilance on any given day.

Separation and labelling controls reduce exposure without eliminating the substance: dedicated allergen-free preparation areas, colour-coded equipment, and clear ingredient labelling in catering. These reduce risk but rely on consistent practice and are therefore weaker than elimination.

Personal adrenaline auto-injectors prescribed to a specific worker are a critical individual control, but they depend on the worker carrying the device - which research consistently shows does not always happen. Employers should actively support prescribed workers to carry their device by providing a safe, accessible place to keep it and normalising its presence rather than treating it as a personal matter that the employer need not know about.

Training, while essential, is the weakest control on its own. A trained first aider who has never seen anaphylaxis in practice may hesitate at the moment of crisis. Training works best when it is paired with regular refreshers, simulation exercises, and a workplace culture where people feel confident to act quickly.

What a Worker Should Do if They Are at Risk or Already Affected

A worker who knows they have a severe allergy should disclose it to their employer - not because disclosure is always legally required, but because it enables the employer to put protective measures in place. Keeping a serious allergy private in a workplace where the allergen is present is a significant personal risk. Workers should ensure their prescribed auto-injector is in date, that they carry two doses where prescribed (as a second reaction may occur before help arrives), and that at least one colleague knows where the device is kept and how to use it.

A worker who has an anaphylactic episode at work must go to hospital even if the auto-injector reversed the symptoms quickly. The biphasic reaction risk is real, and monitoring for several hours in a medical setting is standard care. On return to work, the employer and worker should jointly review the risk assessment, considering whether the trigger has been identified, whether it is present in the workplace, and what additional controls are needed.

What Employers Most Commonly Get Wrong

The most dangerous misunderstanding is that anaphylaxis only happens to people who already know they are allergic. It does not. First presentations at work are well documented, and the worker who has eaten peanuts for years without incident can become sensitised and react severely on an apparently ordinary day.

A second common failure is treating adrenaline auto-injectors as a sufficient solution on their own. An auto-injector buys approximately ten to fifteen minutes of time for emergency services to arrive; it does not cure the reaction. Emergency services must always be called. Employers who believe the device makes a hospital trip unnecessary are operating on a dangerous misunderstanding.

Finally, many workplaces assess only the food in the canteen and overlook the allergens in materials - latex, formaldehyde-releasing preservatives, enzyme-containing cleaning products - that workers handle throughout the day. A complete risk assessment covers every route of exposure relevant to the workplace, not only the lunch menu.

Health at Work supports employers in conducting anaphylaxis risk assessments, designing emergency protocols, and delivering targeted first-aid training that is built around the specific allergens present in your workplace. A prepared workplace does not simply hope nothing happens - it makes survival the likely outcome if it does.