Synopsis
Recognise non-specific and muted presentations of serious illness, compare current function with a reliable baseline, avoid diagnostic overshadowing by age or frailty, and use disciplined broad-to-focused assessment without reflex overtesting.
- Atypical presentation means the initial symptom does not localise the cause: common signals are delirium, falls, immobility, incontinence, anorexia, fatigue and functional decline.
- First-line action is ABCDE, observations, capillary glucose, pain and full examination while collateral establishes exact onset and stable baseline.
- Serious infection can occur without fever or leukocytosis; use physiology, organ dysfunction, source assessment and trajectory rather than one absent classic sign.
Key red flags
New delirium, drowsiness or agitation with physiological change requires urgent infection, hypoxia, metabolic, neurological, pain and medicine assessment.
Acute inattention, fluctuation or altered arousal may be the only visible sign of systemic infection, hypoxia, pain or metabolic disease.
Investigation priorities
Detect immediate physiological and metabolic threat.
Management branches
An older adult presents with a fall, confusion, weakness, poor intake or functional loss.
- Perform ABCDE, glucose, observations and immediate treatment while obtaining last-known-well and baseline collateral.
- Complete full examination and medicine reconciliation and investigate several plausible high-consequence causes in parallel.