7.5 Risk Communication and Crisis Messages

Communicating clearly when stakes feel high

Risk communication is the two-way exchange of information about possible harm and protective action. It applies to outbreaks, environmental exposures, medication risks, food recalls, severe weather, and violence prevention. The CHES role is to help people understand what is known, what is uncertain, what they can do, and where to find updates. The U.S. Centers for Disease Control and Prevention (CDC) framework for the acute phase is Crisis and Emergency Risk Communication (CERC), whose six principles are: be first, be right, be credible, express empathy, promote action, and show respect.

Every crisis message should answer three questions:

• What is known right now?
• What is still uncertain or being investigated?
• What action should people take next, and where will updates appear?

Risk perception is not just probability

People do not respond to numbers alone. Decades of research (Slovic, Sandman) identify fright factors that raise perceived risk even when the statistical risk is small:

A small risk can feel unacceptable if people believe officials are hiding something; a larger risk may be ignored if it feels normal. Sandman's idea of "hazard vs. outrage" captures this: effective communication addresses outrage and emotion without dismissing the concern.

Empathy, uncertainty, and consistency

Empathy comes first. A technically correct message fails if it sounds cold or defensive. After a water advisory, do not open with agency reputation; tell residents whether to boil water, for how long, for whom, and where updates will appear.

Handle uncertainty directly. Saying "there is no concern" while data are incomplete destroys trust if the situation worsens. Instead: explain what is known now, what is still being investigated, when more is expected, and the interim protective action. Do not guess beyond the evidence.

Messages may change as data arrive, and that is acceptable if you explain why: "Additional testing found contamination in two more wells, so the advisory area has expanded." That builds more trust than pretending the first message was final.

Action steps and coordination

Protective actions must be specific. "Be careful" is weak. "Use bottled or boiled water for drinking, brushing teeth, and mixing infant formula until the advisory is lifted" is strong because it names use cases and a stop condition. If the action is hard, include support: transportation, supplies, language access, or help interpreting instructions.

Coordinate sources. Conflicting messages from a school, a health department, and a clinic confuse the audience. A CHES can develop shared talking points, scripts for phone staff, and consistent partner guidance. Coordination prevents avoidable confusion; it does not mean concealing legitimate disagreement.

Fear appeals and exam framing

Avoid fear appeals that leave people helpless. Fear grabs attention but can produce denial, panic, or disengagement when no effective action is offered. Pair any serious risk statement with a feasible protective step and credible support; for chronic risks, overusing fear can also stigmatize affected groups.

On the exam, watch for the best immediate response. During an active crisis, launching a long preference survey is rarely the first step; urgent messages need timely protective guidance built on what you already know about the audience. The best answer usually combines empathy, current evidence, honest uncertainty boundaries, a specific action, and a plan for updates.

The CERC crisis lifecycle

CERC describes phases that change the message focus. In the pre-crisis phase the work is preparation: build relationships, test alert systems, and develop message templates. In the initial phase, be first and be right with simple, repeated facts and acknowledgment of uncertainty. In the maintenance phase, provide ongoing background, correct rumors, and help people understand risk in context. In the resolution phase, explain what happened and what is changing. In the evaluation phase, capture lessons.

Matching the right communication action to the phase is exactly the kind of judgment the exam tests; for example, you do not run a leisurely needs survey during the initial phase.

The mental noise and trust principles

Under stress, people process information poorly, a phenomenon risk experts call mental noise. Practical responses: limit a crisis message to three key points, repeat them, use plain words, and put the action first. A related rule of thumb in risk communication is to keep negative comparisons and reassurances balanced so that a single positive message is not buried by repeated negatives. Trust is built through transparency, timeliness, expertise, honesty, and visible commitment, and it is fragile: one withheld fact that later surfaces can collapse credibility built over years.

Worked scenario: a chemical spill advisory

A tanker spill threatens a neighborhood's tap water. A weak message reads: "Authorities are monitoring the situation and will provide updates as appropriate." It fails CERC on empathy and action. A strong message follows the structure below:

This structure is reusable across outbreaks, recalls, and weather events. On exam items, prefer the option that pairs acknowledgment of feeling with a specific protective instruction and an update plan, and reject options that lead with reassurance, agency reputation, or silence until certainty.