History and physical examination are often sufficient to make the diagnosis. Many elderly patients with<unk>  will be unable to provide an accurate history, so family members or caregivers must be involved.
A thorough review of medications is necessary, as polypharmacy may contribute to<unk> .
CBC, CMP, UA, ECG, and CXR are usually indicated
Consider:
troponin, cultures, head CT, ESR, CRP, TSH, HIV, RPR
Mini Mental Status Exam to screen for cognitive decline
A thorough review of medications is necessary, as polypharmacy may contribute to<unk> .
troponin, cultures, head CT, ESR, CRP, TSH, HIV, RPR
Mini Mental Status Exam to screen for cognitive decline
Failure to thrive
Chronic or recurrent infections
Stridor 
Immunodeficiency
Stridor
Endocrine disorder
Hiccups
Cancer