Borreliose Wissen No. 31 is the member magazine of the patient organization Borreliose und FSME Bund Deutschland e.V. and has not been published in bookstores so far. Twice a year, the editorial team focuses on a specific topic that is of particular interest to chronic Lyme disease patients. The April 2015 issue concentrates on the "gut," as gastrointestinal disturbances are a very common side effect of Lyme disease therapy. Two-thirds of the gut forms the immune system. The gut, along with its nervous system, is arguably the largest sensory organ in the body. Its pathways extend to the brain. Those affected by irritable bowel syndrome often also suffer from anxiety attacks or depression. Disorders in the digestive tract can lead to a wide range of complaints, including joint pain, headaches, and fatigue.