Phobias Causes Research Findings on the Genetics of Phobias By Lisa Fritscher Lisa Fritscher Lisa Fritscher is a freelance writer and editor with a deep interest in phobias and other mental health topics. Learn about our editorial process Updated on October 23, 2020 Medically reviewed Verywell Mind articles are reviewed by board-certified physicians and mental healthcare professionals. Medical Reviewers confirm the content is thorough and accurate, reflecting the latest evidence-based research. Content is reviewed before publication and upon substantial updates. Learn more. by Daniel B. Block, MD Medically reviewed by Daniel B. Block, MD LinkedIn Twitter Daniel B. Block, MD, is an award-winning, board-certified psychiatrist who operates a private practice in Pennsylvania. Learn about our Medical Review Board Print PeopleImages/DigitalVision/Getty Images Phobias are extreme fears that make it impossible to function normally. Phobias may grow out of really negative experiences, but because they are overwhelming and often irrational, they become disabling. There are many different types of phobias; some of the most common include: Fear of specific animals (dogs, spiders, etc.)Fear of open spaces, enclosed space, or high placesFear of natural events, such as thunderstorms While fears are an unavoidable part of being human, most fears can be controlled and managed. Phobias, however, cause psychological and physical reactions that are difficult if not impossible to manage. As a result, people with phobias will go to great lengths to avoid the object of their fears. What Causes Phobias? Why does someone react to a normal, everyday event — the bark of a dog, for example — with extreme fear and anxiety? Why do other people react to the same experience with mild anxiety or calm? The causes of phobias are not yet widely understood. Increasingly, however, research shows that genetics may play at least some role. Studies show that twins who are raised separately have a higher than average rate of developing similar phobias. Other studies show that some phobias run in families, with first-degree relatives of phobia sufferers more likely to develop a phobia. In “Untangling genetic networks of panic, phobia, fear, and anxiety,” Villafuerte and Burmeister reviewed several earlier studies in an attempt to determine what, if any, genetic causes can be identified for anxiety disorders. Family Studies Suggest a Genetic Link If a family member has a phobia, you are at an increased risk for a phobia as well. In general, relatives of someone with a specific anxiety disorder are most likely to develop the same disorder. In the case of agoraphobia (fear of open spaces), however, first-degree relatives are also at increased risk for panic disorder, indicating a possible genetic link between agoraphobia and panic disorder. Researchers have found that first-degree relatives of someone suffering from a phobia are approximately three times more likely to develop a phobia. According to the findings, twin studies showed that when one twin has agoraphobia, the second twin has a 39% chance of developing the same phobia. When one twin has a specific phobia, the second twin has a 30% chance of also developing a specific phobia. This is much higher than the 10% chance of developing an anxiety disorder found in the general population. Gene Isolation Suggests a Link Between Phobias and Panic Disorder Although they were unable to specifically isolate the genetic causes of phobias, Villafuerte and Burmeister reviewed several studies that appear to demonstrate genetic anomalies in both mice and humans with anxiety disorders. The early research appears to show that agoraphobia is more closely linked to panic disorder than to the other phobias, but is far from conclusive. Conclusion More research will need to be performed in order to isolate the complex genetics involved in the development of phobias and other anxiety disorders. However, this study does support the theory that genetics play a major role. Sources Verywell Mind uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. Villafuerte, Sandra and Burmeister, Margit. Untangling genetic networks of panic, phobia, fear and anxiety. Genome Biology. July 28, 2003. 4(8):224. By Lisa Fritscher Lisa Fritscher is a freelance writer and editor with a deep interest in phobias and other mental health topics. See Our Editorial Process Meet Our Review Board Share Feedback Was this page helpful? Thanks for your feedback! What is your feedback? Other Helpful Report an Error Submit Speak to a Therapist Online Advertiser Disclosure × The offers that appear in this table are from partnerships from which Verywell Mind receives compensation.