Patients with Crohn's disease are advised not to smoke, as smoking can cause many harms, including disturbances in intestinal blood circulation, which can exacerbate the symptoms of Crohn's disease. Typical symptoms include abdominal pain, diarrhea, and intestinal obstruction, as well as possible fever and nutritional disorders. The diet should consist of frequent small meals, low in fat and high in calories, and may include vegetables such as carrots, potatoes, and yams, while avoiding raw, spicy foods and foods that cause gas. During active phases, strict rest is recommended along with calorie supplementation and high nutritional support to actively prevent complications. Crohn's disease tends to recur frequently and can have a protracted course.