A combination of symptoms caused by release into the circulation of excessive amounts of serotonin and other hormonal substances from some carcinoid tumors. Symptoms may include flushing of the face, diarrhea, bronchial spasms (wheezing), rapid pulse, and sudden blood pressure changes (usually a fall) along with other symptoms of heart failure. Carcinoid syndrome is often mistaken for common diseases including irritable bowel syndrome, peptic ulcer, lupus, asthma, or menopause.
