NHS Hospital Critical Incident: What It Means & What Happens

Few things make “critical incident” as stark as hearing it outside a hospital, but for NHS trusts in south-east England, that became reality in January 2026 as winter pressures pushed A&E to the brink. This article explains what a critical incident means, how hospitals respond, and what patients should expect.

NHS hospital trusts that declared critical incidents in January 2026: 4 (Surrey and Kent) ·
Hospitals affected across England: Over 10 ·
Primary causes cited: Winter flu, norovirus surge, high A&E demand ·
Typical duration of a critical incident: 24-72 hours (varies) ·
A&E admissions increase compared to previous year: Up to 30% in some trusts

Five key data points frame the current critical incident situation:

What is a critical incident in the NHS?

Official NHS definition

• The NHS defines a critical incident as an event that severely disrupts normal hospital services and requires extraordinary measures to maintain patient safety (NHS England – patient safety framework).
• Triggers include overwhelming demand, staff shortages, or infrastructure failures (Hospital trust explainer video – YouTube).
• It is not a Major Incident – it’s a local hospital-level escalation aimed at patient flow and capacity (NHS England – PSIRF framework).

Think of it as the hospital’s internal alarm: normal operations can’t keep up, so the trust activates contingency plans to protect patient safety. The response focuses on freeing beds, redirecting ambulances, and cancelling non-urgent procedures. According to the hospital trust explainer video, a critical incident often means ambulances are queued outside and emergency departments are physically unable to take new arrivals.

Key characteristics of a critical incident

• Rapid onset: Usually triggered by a surge in demand – flu, norovirus, or a combination of both.
• Duration: Most resolve within 24 to 72 hours, but prolonged pressure can extend the timeline (NHS England – incident response framework).
• Response measures: Cancellation of elective surgeries, redeployment of staff to critical areas, and public appeals to avoid A&E unless absolutely necessary.

The implication: Patients should plan for delays and avoid A&E unless absolutely necessary.

What is a Major Incident?

How a Major Incident differs from a critical incident

• In the UK, a Major Incident is defined by emergency services and typically involves a coordinated multi-agency response (NHS England – PSIRF framework references this distinction).
• A critical incident is a hospital-level disruption; a major incident often requires broader regional coordination, such as mass casualty events or cyberattacks.
• The recent declarations in Surrey and Kent were critical incidents, not Major Incidents, meaning the response remained within the trusts (BBC News – UK broadcaster).

The difference is crucial: a Major Incident mobilises police, fire, and ambulance services across a region. A critical incident keeps the response inside the hospital walls, though local emergency services are notified.

Examples of Major Incidents (e.g., mass casualty, cyberattack)

• Major Incidents are pre-planned for scenarios like terrorist attacks, train crashes, or large-scale cyberattacks on healthcare systems.
• NHS England’s Patient Safety Incident Response Framework (PSIRF) covers the broader incident classification but focuses on patient safety investigations rather than operational Major Incidents.

What this means: Understanding the distinction helps patients gauge the severity and respond appropriately.

What happens when a critical incident is declared?

Immediate actions taken by hospital staff

• Non-urgent services are paused or reduced (NHS England – PSIRF framework).
• Staff are redeployed to critical areas: emergency departments, intensive care, and medical wards.
• The public is asked to only use 999 and A&E for genuine emergencies (NHS UK – when to call 999).
• Ambulances may be diverted to other hospitals (Hospital trust explainer video – YouTube).

Three options during a critical incident: cancel elective surgeries, redirect ambulances, activate surge capacity

• Cancel elective surgeries: All non-urgent surgeries are postponed to free up beds and staff.
• Redirect ambulances: Some trusts request ambulances to bypass their A&E and take patients to another hospital.
• Activate surge capacity: Additional beds are opened in wards, corridors, or even community facilities.

These measures are outlined in trust-level contingency plans. The NHS England PSIRF framework provides the overarching guidance for incident response, though each trust tailors the specifics to its local capacity.

Communication with patients and the public

• Trusts issue public statements via their websites and social media.
• NHS England advises patients to call NHS 111 for non-urgent care and only use 999 for life-threatening emergencies.
• Local media (BBC, The Guardian) amplify the message (BBC News – UK broadcaster, The Guardian – UK newspaper).

The pattern: Each measure prioritises immediate capacity over long-term scheduled care.

Which NHS trusts have declared critical incidents?

Trusts in south-east England (Surrey and Kent) in January 2026

• Four NHS trusts in England declared critical incidents in mid-January 2026 (BBC News – UK broadcaster).
• Trusts include East Surrey Hospital and others in Kent (The Guardian – UK newspaper).
• Reasons cited: flu, norovirus, and high A&E demand.

Reasons cited: flu, norovirus, and high A&E demand

• Winter flu season hit harder than usual, with some trusts seeing a 30% increase in A&E admissions compared to the previous year (BBC News – UK broadcaster).
• Norovirus outbreaks in wards reduced available bed capacity.
• High demand persisted even after the holiday period, pushing already stretched services over the edge.

Other recent examples across the UK

• Similar declarations have occurred in previous winters; for example, in 2022-2023 multiple trusts in the North West and Midlands declared critical incidents.
• The pattern is cyclical: winter pressures, combined with staff shortages and delayed discharges, create recurring capacity crises.

For related health guides, see our Kg to Stone and Pounds – Complete NHS Conversion Guide and What Is the Normal Blood Pressure – Evidence-Based Guide for All Ages.

How long do critical incidents usually last?

Typical duration (24-72 hours)

• Most critical incidents resolve within 1 to 3 days (NHS England – PSIRF framework).
• The declaration is time-limited: once patient flow improves and capacity is restored, the incident is stood down.
• Some trusts in January 2026 reported resolution after 48-72 hours, though specific data is not yet public (BBC News – UK broadcaster).

Factors that can extend the incident

• Prolonged high demand (e.g., a second wave of flu).
• Staff absence due to illness.
• Delayed discharge of patients who cannot be safely sent home (lack of social care capacity).

When the incident is lifted

• The incident ends when the trust can safely resume normal services.
• This decision is made by the hospital’s incident management team after assessing A&E waiting times, bed occupancy, and staffing levels.
• A public announcement is typically issued once the incident is no longer active.

“The decision to declare a critical incident is never taken lightly. It reflects the significant ongoing pressure we are facing and the need to take extraordinary steps to protect our patients.”

— NHS trust spokesperson, speaking to BBC News (BBC News – UK broadcaster)

“A critical incident means the hospital is at or over capacity – ambulances waiting outside, very sick patients inside, and emergency departments unable to receive more.”

— Hospital trust explainer video (Hospital trust explainer video – YouTube)

The pattern is clear: winter pressures push hospitals to their limits, but the system is designed to absorb the shock. For the NHS and patients, the trade-off between immediate capacity and the longer-term impact of cancelled services remains the central challenge. For the trusts in Surrey and Kent, the immediate priority is restoring normal operations while ensuring no patient is left without care.

For a patient-focused perspective on what happens during an NHS hospital critical incident, the article explains how these events affect those receiving care.

Frequently asked questions