Followings are the symptoms of carcinoid symptoms a) Wheezing b) Flushing c) Cyanosis d) Clubbing e) Diarrhoea
**Core Concept**
Carcinoid syndrome is a paraneoplastic disorder caused by the secretion of excess vasoactive substances, such as serotonin (5-HT), from a carcinoid tumor, typically of the gastrointestinal tract. These substances lead to a range of systemic symptoms, including cutaneous flushing, diarrhea, wheezing, and heart valve abnormalities.
**Why the Correct Answer is Right**
The correct answer is a combination of the options listed. Carcinoid syndrome is characterized by the classic symptom triad of flushing, diarrhea, and wheezing. Flushing occurs due to the release of serotonin and other vasoactive substances, leading to vasodilation and increased blood flow to the skin. Diarrhea is caused by the release of serotonin, which stimulates intestinal smooth muscle contraction and increases gut motility. Wheezing occurs due to the bronchoconstrictive effects of serotonin and other vasoactive substances, leading to airway constriction and respiratory symptoms.
**Why Each Wrong Option is Incorrect**
* **Option C:** Cyanosis is not a typical symptom of carcinoid syndrome. While patients may experience respiratory symptoms such as wheezing, cyanosis is not a characteristic feature of the syndrome.
* **Option D:** Clubbing is a sign of other conditions, such as lung cancer or cystic fibrosis, but is not typically associated with carcinoid syndrome.
**Clinical Pearl / High-Yield Fact**
The carcinoid syndrome is often referred to as the "flushing diarrhea syndrome." This classic symptom triad is a key diagnostic clue for this paraneoplastic disorder.
**Correct Answer:** B. Flushing