What is a key symptom of carcinoid syndrome?

Carcinoid syndrome occurs as a result of neuroendocrine tumors (carcinoid tumors) that typically secrete serotonin and other vasoactive substances into the bloodstream. One of the hallmark symptoms of carcinoid syndrome is cutaneous flushing, which manifests as episodes of reddening of the skin, usually on the face and neck. This flushing is caused by increased levels of serotonin and other substances that lead to vasodilation.

The flushing can be triggered by various factors, including stress, certain foods, and alcohol, and it is often accompanied by other symptoms such as diarrhea and wheezing. This distinctive symptom helps in the clinical diagnosis of carcinoid syndrome and differentiates it from other conditions.

Although abdominal effusion, dermatitis, and hypoglycemia can occur in different clinical scenarios, they are not characteristic symptoms of carcinoid syndrome. Understanding the specific symptoms, such as cutaneous flushing, is crucial for healthcare providers when evaluating a patient suspected of having carcinoid tumors.