 The Roots of Anxiety According to the Anxiety and Depression Association of America, 40 million Americans over the age of 18 are affected by anxiety. Most of us who suffer from anxiety are quite familiar with its symptoms, but how about its root causes? Some common root causes of anxiety include environmental factors. Environmental factors that are known to cause several types of anxiety include loss of a loved one, stress in relationships, stress at work, stress from school, family history, genetic predisposition. Some people may have a genetic predisposition that gives them the greater chance of suffering from anxiety disorders. Medical factors, asthma, heart disease, diabetes, thyroid problems, common anxiety signs and symptoms include brain fog, irritability, palpitations, muscle tension, nausea, nightmares, panic, or weakness. If you have any questions about anxiety and would like to speak with a registered nurse, please call, visit or email the Professional Supplement Center and one of our knowledgeable staff members will be happy to assist you. Thank you.