Patients presenting to emergency departments (ED) with non-specific complaints (NSC) such as "not feeling well", "feeling weak", "being tired", "general deterioration" are a very common and well-known, but poorly studied patient group. The differential diagnosis of NSC is extremely broad ranging from insufficient home care to acute life-threatening conditions. Therefore, the evaluation and diagnostic work-up of these mostly elderly patients with NSC is very time-consuming and not straight-forward. Furthermore, the assessment is complicated by comorbidities, polypharmacy or an altered mental status. For this reason, potentially unnecessary diagnostic efforts are undertaken in order to exclude a serious underlying condition, leading to prolonged throughput times and ED observation unit stays.