Evaluate airway!
Testing/studies dependant on suspected underlying cause, based on history/exam
Dysphonia
Tracheal injury, laryngeal airway trauma, Strangulation
Dysarthria
Posterior sternoclavicular dislocation
Dysgeusia
Iatrogenic injury to recurrent laryngeal nerve: vagal nerve stimulator complication, ENT, thyroid, or thoracic surgery
Ergotism
Foreign body aspiration