There are a number of different types of anxiety disorders including generalized anxiety disorder, panic disorder, obsessive compulsive disorder and post traumatic stress disorder. Symptoms might consist of feelings of fear, nausea, racing heart, elevated blood pressure, sweaty palms, churning stomach or trembling.
Anxiety is sometimes caused when there is a conflict in a person's mental process. This might include memories of traumatic past experiences, spiritual despair or internal distress.
The National Institute of Mental Health suggests that some anxiety disorders are inherited. These include panic disorders, obsessive compulsive disorder, social anxiety disorder and generalized anxiety disorder.
According to the Mayo Clinic, imbalances in the brain with naturally occurring chemicals such as dopamine, serotonin and norepinephrine may contribute to anxiety issues.
Certain diseases, such as cardiovascular, lung, endocrine, neurological and infections may produce anxiety disorders. It is important to see a doctor to rule out specific medical conditions.
Environment is a key factor in post traumatic stress disorder (PTSD). PTSD was first discovered in war veterans, but can also occur as a result of a plane crash, train wreck, mugging, rape, bombing or natural disaster.
According to the National Institute of Mental Health, anxiety disorders affect almost 40 million Americans 18 years of age or older. Learning the causes of this disorder can help control the symptoms.