Because the Earth is a three-dimensional sphere and not merely a two-dimensional flat, East-West surface. Because of this spherical shape, often times the shortest distance is flying more north and south, up over the Northern latitudes and the North Pole, rather than flying east/west over the Pacific.
1 Too few red blood cells (anemia). 2  Some people with Crohn's disease develop anemia because of low iron levels caused by bloody stools or the intestinal inflammation itself. A high fever may mean that you have an infection, such as an abscess. 2  Weight loss. 3  Ongoing symptoms, such as diarrhea, can lead to weight loss. 4  Too few red blood cells (anemia). 5  Some people with Crohn's disease develop anemia because of low iron levels caused by bloody stools or the intestinal inflammation itself.
Ulcerative colitis is a related condition. The exact cause of Crohn disease is unknown. It occurs when your body's immune system mistakenly attacks and destroys healthy body tissue (autoimmune disorder). When parts of the digestive tract remain swollen or inflamed, the walls of the intestines become thickened. Factors that may play a role in Crohn disease include: Your genes and family history. (People of Jewish descent are at higher risk.)