Complications from bronchoscopy are rare and most often minor, but if they occur, may include breathing difficulty, vocal cord spasm, hoarseness, slight fever, vomiting, dizziness, bronchial spasm, infection, low blood oxygen, bleeding from biopsied site, or an allergic reaction to medications. Only rarely do patients experience other more serious complications (for example, collapsed lung, respiratory failure, heart attack and/or cardiac arrhythmia).