Early Warning Signs: What to Notice and When to Act

Subtle changes are easier to assess when their timing and progression are recognised.

Some warning signs need a response within minutes. Others creep up over weeks: repeated memory lapses, withdrawing from whānau, missing money or a crack that widens after heavy rain. First establish what has changed and whether waiting could put someone at risk.

The next step depends on the danger. Suspected heart-attack symptoms need an ambulance. After a long or strong earthquake near the coast, move to high ground as soon as the shaking stops. Changes in thinking or daily functioning that persist need assessment, even if they seem minor at first.

When is a warning sign urgent?

One serious warning can matter more than several mild symptoms. The possible consequence determines how quickly to act.

Situation	Examples	Next step
Immediate danger	Possible heart attack, severe breathing difficulty, immediate threat of violence, rapidly moving landslide, or natural tsunami signs.	Call 111 for an emergency requiring police, fire or ambulance. For a coastal tsunami threat, evacuate immediately as directed by natural-warning guidance; do not wait for a phone alert.
Prompt assessment needed	New confusion, worsening mental health, recurrent infections, repeated low blood-glucose episodes, or a rapidly changing physical or behavioural pattern.	Contact a GP or an appropriate health professional promptly. If uncertain about medical urgency, call Healthline 0800 611 116.
Monitor and arrange help	Gradual memory difficulties, changing sleep or concentration, gambling or substance-use patterns, dampness or progressive building defects.	Record what changed, its frequency and impact; seek the appropriate clinical, support or technical assessment rather than waiting for a crisis.

Use the urgency levels below as a starting point. A sudden or unusual change may still need urgent attention, even when it looks mild.

Common early warning signs in health and everyday functioning

Changes in memory, thinking and communication

Forgetting a name occasionally is common. Repeating the same question, getting lost on a familiar route or struggling with bills and routine tasks is different. Disorientation, changes in judgement and difficulty following conversations can occur with dementia or other cognitive conditions. They can have other causes too; a GP can investigate.

Has the change affected cooking, driving, work or living independently? That matters more than an isolated lapse. Sudden confusion needs urgent medical assessment rather than routine monitoring.

Physical symptoms that should not be dismissed

Unusual breathlessness or fatigue should be considered in context, especially if new or worsening.

Heart-attack warning signs can include pain or discomfort in the chest, arms, back, neck, jaw or shoulders, as well as shortness of breath, nausea, dizziness and sweating. Symptoms are not identical for everyone and may come and go. If a heart attack is suspected, call 111 and ask for an ambulance rather than driving yourself or waiting for symptoms to become more obvious.

In someone with diabetes, sweating, shaking, hunger or blurred vision may mean low blood glucose (hypoglycaemia). Follow the person’s diabetes care plan for testing and treatment. Severe confusion, seizures or unconsciousness require emergency help. Repeated or unusually severe infections also deserve medical assessment; occasionally, an underlying condition such as primary immunodeficiency is involved.

Sleep, mood and behavioural changes

Persistent sleep disruption can occur alongside changes in mood, energy and concentration.

Has someone stopped seeing friends or whānau, lost interest in activities or begun sleeping very differently? Persistent irritability, poor concentration and hopelessness can accompany stress or deteriorating mental health. Unusual suspiciousness, disorganised thinking or perceptions others do not share may occur in early psychosis. A clinician needs to assess these experiences sensitively; observations alone are not a diagnosis.

No checklist predicts every mental health crisis. If a person talks about suicide or cannot stay safe, call 111. For non-emergency support in New Zealand, call or text 1737.

Signs of harmful behaviour, dependence and relationship risk

Warning signs also appear in everyday decisions. Someone experiencing gambling harm may chase losses, borrow to gamble, conceal transactions or repeatedly fail to cut back. Alcohol or other drug dependence may show up as cravings, increasing use, missed commitments and continued use despite harm.

A missed rent payment, unexplained cash withdrawal or abandoned activity is often easier to discuss than a label such as “addiction”. Gambling and substance use can strain relationships, work and finances. Support need not wait until someone reaches “rock bottom”.

Coercive control is different from a disagreement: a person may isolate a partner, monitor their movements, threaten them or restrict access to money. Seek specialist family-violence advice through a safe channel; call 111 if danger is immediate. Do not infer abuse, radicalisation or violent extremism from appearance, identity or beliefs. Focus on conduct and credible threats.

Early environmental and structural warning signs

Tsunami, landslides and rapidly changing conditions

Near New Zealand’s coast, a strong earthquake that makes standing difficult, shaking that lasts longer than a minute, an unusual sea noise or a sudden change in sea level can warn of a tsunami. Civil Defence’s rule is “Long or Strong, Get Gone.” During shaking, protect yourself. Then move to high ground or inland without waiting for an official alert.

After heavy rainfall or an earthquake, new ground cracks, small slips, tilting trees or retaining walls, stuck doors and windows, shifting decks or water emerging from a slope may indicate ground movement. If a landslide threatens, leave its path and move to safety. Do not remain in a dangerous location to document damage.

Building deterioration and concealed damage

A new or widening crack in cladding, corrosion, loose masonry, failed seals or recurring water ingress may signal façade damage. Not every crack threatens the structure, but falling material or visible movement demands caution. Keep people away from unstable parts and ask a qualified building professional to inspect them.

Researchers also track shifts in ecosystem recovery and variability as potential signals of ecological tipping points. Such indicators cannot tell them exactly when an ecosystem will collapse; they flag changes worth investigating.

What happens when early warning signs are ignored?

Delay has different costs in different settings. It may mean missed treatment, more extensive building damage or lost time to evacuate. A warning sign does not guarantee that any of those outcomes will occur.

• Health: missed assessment can delay diagnosis and treatment, allowing symptoms or complications to worsen. Some conditions may affect independence and quality of life.
• Behaviour and relationships: untreated dependence or escalating control may contribute to financial loss, isolation, family harm and reduced wellbeing.
• Safety: failing to act on an immediate natural warning can expose people to serious injury or loss of life.
• Property: overlooked moisture, corrosion or slope movement can increase repair costs and the risk of damage.
• Organisations: unresolved complaints, weak reporting, poor governance and repeated safety breaches may precede operational, financial or reputational harm.
• Environment: sustained degradation can reduce ecological resilience, sometimes making recovery more difficult.

Equally, an isolated minor change is not proof of a catastrophe. Check the context and seek a proportionate assessment rather than guessing at the worst explanation.

How to tell a passing change from a concerning pattern

When something changes, ask:

1. Is it new? Compare the sign with the person’s or place’s usual baseline, not with a generic definition of “normal”.
2. Is it persistent or escalating? Record frequency, duration, severity and whether symptoms or damage are increasing.
3. Is there a cluster? Memory problems alongside disorientation, or new cracks alongside a tilting retaining wall, may change the urgency of assessment.
4. What is the practical impact? Consider daily functioning, ability to stay safe, financial stability, relationships or physical access to the building.
5. What is the cost of waiting? A suspected heart attack or natural tsunami warning is not a “watch and see” situation; a mild, stable concern may allow time for a scheduled assessment.

Write down when a change began, how often it happens and whether it is getting worse. Photos can help show property damage developing, provided taking them is safe. A symptom diary and medication list can help a clinician, but neither replaces an examination. Never delay emergency action to finish documenting events.

What to do when you notice warning signs

A clear record of symptoms and changes can help a clinician assess what should happen next.

For yourself

For an immediate threat, call emergency services. Otherwise, tell a GP or relevant professional exactly what has changed, how long it has been happening and how it affects daily life. If you are unsure how urgent a health concern is, call Healthline.

For someone close to you

Speak privately and refer to what you have noticed: “You’ve missed meals and hardly slept this week,” rather than “Something is wrong with you.” Ask what help they would accept. If coercive control or abuse is suspected, avoid confronting a suspected perpetrator or taking steps that may increase the person’s risk; specialist services can help plan safely.

For a property, workplace or community

For unsafe buildings or workplaces, keep people out of danger and notify the person responsible for assessing the hazard, such as a building manager, engineer or employer. Follow Civil Defence evacuation advice where relevant. Record the problem after everyone is safe, then check whether the repair or protective step worked.

Common mistakes that delay action

• Waiting for every textbook symptom: emergencies do not always present in the same way for every person.
• Assuming one sign proves one cause: memory change, fatigue, dampness and social withdrawal all have multiple possible explanations.
• Normalising a worsening trend: gradual change can feel familiar even when its impact is increasing.
• Relying on an alert that may arrive too late: a local tsunami can follow natural warning signs before an official message is issued.
• Monitoring without a trigger for action: decide in advance what worsening, recurrence or safety risk should prompt reassessment.
• Using support as a substitute for emergency services: counselling and routine appointments cannot replace an urgent response to immediate danger.

Getting help in New Zealand

Support, monitoring and professional advice can all play a role after immediate risks are addressed.

• Emergency services: call 111 for an immediate threat to life or safety; request ambulance, police or fire as appropriate.
• Healthline: call 0800 611 116 for health advice when you are unsure what to do next.
• Mental wellbeing: call or text 1737 for free support at any time; immediate danger still requires 111.
• Natural hazard planning: consult Get Ready and your local Civil Defence Emergency Management Group for local risks, evacuation zones and response guidance.
• Condition-specific help: use trusted New Zealand organisations and relevant specialists for concerns involving dementia, cardiovascular health, diabetes, harmful gambling, addiction or family safety.

Frequently asked questions

Are early warning signs always obvious?

Not always. A chest symptom can appear suddenly; a change in memory, finances or a retaining wall may build gradually. Compare what you notice with the usual pattern and consider the possible harm.

Can several minor signs be more important than one?

Yes. Several persistent changes may be more concerning together. But a suspected heart attack needs action even without any other symptom.

What if the warning signs disappear?

Not necessarily. Heart-attack symptoms, for example, can come and go. Seek medical advice after a potentially serious episode even if you feel better.

How do I avoid overreacting?

Consider speed, severity and what could happen if you wait. Seek assessment when the cause is unclear. Do not treat every small change as an emergency, but do not delay when immediate harm is possible.

When should I stop monitoring and seek help?

Seek help when a change persists, worsens, affects daily life or raises a safety concern. When danger is immediate, stop monitoring and act.