The onset of all the symptoms of Carcinoid Syndrome at once. Sudden flushing of the face or upper body, a rapid and serious drop in blood pressure, and—less frequently—asthma, are all signs of carcinoid crisis. Carcinoid crisis is the most serious, life-threatening aspect of Carcinoid Syndrome, and may mimic an anaphylactic attack. It’s important to seek medical care for carcinoid crisis. Treating a carcinoid crisis with epinephrine, the most commonly used medicine for an anaphylactic attack, will make the crisis worse.