Fatigue is considered a symptom, rather than a sign, because it is a subjective feeling reported by the patient, rather than an objective one that can be observed by others.
Træthed betragtes som et symptom, snarere end et sygdomstegn, fordi det er en subjektiv følelse der reporteres af patienten, snarere end et et objektivt tegn, der kan observeres af andre.