Final answer:
Peptic ulcers can be caused by various factors including Helicobacter pylori infection, chronic use of NSAIDs, smoking, and stress. Spicy foods and alcohol consumption were once thought to cause ulcers, but this has been disproven. The most common cause of peptic ulcers is infection with H. pylori.
Step-by-step explanation:
Peptic ulcers can be caused by various factors such as the bacterium Helicobacter pylori, chronic use of non-steroidal anti-inflammatory drugs (NSAIDs), smoking, and stress. Spicy foods and alcohol consumption were once believed to cause peptic ulcers, but this has been debunked. Diet does not seem to play a significant role in the development of peptic ulcers. The most common cause of peptic ulcers is H. pylori infection, which can be transmitted through contaminated food or water, and even through kissing or sharing utensils.