Aggression

Aggression refers to hostile or combative behaviour directed at people or objects — distinct from internal restlessness or distress in that it involves outward, directed action. In harm-reduction contexts the term marks a point where a person's environment has become unsafe and verbal reassurance alone has stopped working.

The word describes the behaviour, not what is driving it. Stimulant intoxication, alcohol or benzodiazepine withdrawal, dissociative states, hypoglycaemia, and acute psychiatric episodes can each produce aggression that looks similar from the outside. Identifying the behaviour is the beginning, not the end, of understanding the situation.

How it is done

Managing aggression in an acute substance-related context begins with reducing stimulation: lowering noise and crowding, keeping responders calm and positioned at a non-confrontational angle, and avoiding physical contact unless the person or others are in immediate danger.

Verbal de-escalation uses simple language, a steady tone, and minimal demands. Asking basic orienting questions — name, location, what has been taken — can reveal whether confusion or intoxication is a primary driver. A low-stimulus environment and a non-threatening presence are often sufficient when the underlying state is not severely physiological.

When de-escalation produces no response, or when behaviour places the person at immediate physical risk, emergency services are the appropriate next step. Physical restraint without medical support is not a harm-reduction intervention.

When it matters

Aggression becomes a medical priority when it accompanies signs of physiological stress: elevated body temperature, racing or irregular heartbeat, inability to orientate to place or person, or seizure activity. In stimulant intoxication specifically, a combination of aggression and hyperthermia points toward a state where continued exertion raises cardiovascular and thermoregulatory risk.

Unexpected aggression in a setting associated with opioids warrants immediate reassessment. Opioid overdose characteristically produces sedation; a person who is agitated or combative in that context may be hypoxic, may have taken additional substances, or may have a separate medical emergency. The behaviour signals a more complex picture than a straightforward single-substance presentation.

What it cannot tell you

Aggression does not identify its own cause. The same outward behaviour — raised voice, combative movement, resistance to approach — can arise from stimulant toxicity, alcohol withdrawal, severe dissociative intoxication, a head injury, or an acute psychiatric episode unrelated to substances. The behaviour alone does not distinguish between these, and the appropriate response differs considerably depending on the cause.

A period of calm does not confirm that the underlying state has resolved. Aggression in stimulant intoxication or during alcohol withdrawal can cycle; a window of calm is not a reliable indicator that the crisis has passed, and withdrawing monitoring at that point carries its own risk.