The true causes of many illnesses such as allergies, intestinal diseases, migraines, or Lyme disease – many chronic health disorders are caused by parasites. However, as long as the connection is not understood, the prospects for healing are poor. Allergy specialist and alternative practitioner Alan E. Baklayan explains in the new edition of his foundational work the relationships between infestation, metabolic processes, and symptoms. At the same time, he provides valuable tips and practical, understandable information on diagnosis, treatment, and self-help for parasitic infestations. This book is the updated new edition of Alan E. Baklayan's book "Parasites - the Hidden Cause of Many Illnesses," which was first published by Goldmann in 1999.