Step 1: Understanding acute pancreatitis.
Acute pancreatitis is an inflammation of the pancreas that occurs suddenly and can be severe. The most common causes are alcohol abuse and gallstones.
Step 2: Analyzing the options.
(1) Alcohol abuse: This is the most common cause of acute pancreatitis. Chronic or heavy drinking can lead to inflammation of the pancreas.
(2) Gallstones: Gallstones can also cause acute pancreatitis, but alcohol abuse is more common.
(3) Hypertriglyceridemia: This is a less common cause of pancreatitis, typically occurring with very high triglyceride levels.
(4) Viral infections: Though viral infections can cause pancreatitis, it is a rarer cause compared to alcohol abuse and gallstones.
Step 3: Conclusion.
The most common cause of acute pancreatitis is (1) Alcohol abuse.