Most common symptom of CA head of pancreas
**Core Concept**
The most common symptom of pancreatic cancer is related to the obstruction of the pancreatic duct, leading to jaundice and its associated symptoms. This is due to the tumor's location in the head of the pancreas, which is closer to the bile duct and duodenum.
**Why the Correct Answer is Right**
The correct answer is jaundice, which is caused by the obstruction of the common bile duct by the tumor. This leads to a buildup of bilirubin in the blood, resulting in yellowing of the skin and eyes. The mechanism of this symptom is related to the anatomical proximity of the head of the pancreas to the common bile duct and the subsequent compression or invasion of the duct by the tumor.
**Why Each Wrong Option is Incorrect**
* **Option A:** Weight loss is a common symptom of pancreatic cancer, but it is not the most common symptom. Weight loss occurs due to malabsorption of nutrients and is more related to the tumor's location in the body and its effects on the surrounding tissues.
* **Option B:** Abdominal pain is a symptom of pancreatic cancer, but it is not the most common symptom. Abdominal pain occurs due to the tumor's invasion into adjacent structures or its metastasis to distant sites.
* **Option C:** Diarrhea is not a common symptom of pancreatic cancer. Pancreatic cancer typically leads to malabsorption of fats and proteins, resulting in steatorrhea (fatty stools), not diarrhea.
**Clinical Pearl / High-Yield Fact**
The "Triangle of Cancer" is a useful mnemonic to remember the three most common symptoms of pancreatic cancer: jaundice, weight loss, and abdominal pain. This mnemonic highlights the importance of these symptoms in the diagnosis of pancreatic cancer.
**Correct Answer:** A. Jaundice