Causes of anxiety disorders
 Although the researchers do not know exactly why some people suffer from anxiety disorders, they know that there are different factors involved and like many of the conditions of mental health, and anxiety disorders seem to be due to a combination of the individual factors of biological, psychological, and others.
 How can we think and behave in certain situations affecting the concern. Some people might think that some cases are more serious than it actually is (for example, fear of flying). Others may have a bad experience and they fear this will happen again (for example, a dog bite). Some psychologists believe that childhood experiences can also contribute to anxiety.
 Researchers know that the problems with the chemistry of the brain can contribute to the development of anxiety disorders. Certain neurotransmitters (chemical messengers) in the brain and include participation in the concerns of serotonin, norepinephrine, and gamma-aminobutyric acid (GABA). The researchers also demonstrated that the changes involved in activity in certain areas of the brain in the case of concern. Run many of the anxiety disorders in families and likely genetic cause.
 Can cause certain medical conditions such as problems of anemia, thyroid, also result in symptoms of anxiety. Also, can other factors such as caffeine, alcohol and some drugs cause the symptoms of anxiety.
 May be painful life events, such as the death of a family member, witnessing death and war and natural disasters such as hurricanes and earthquakes cause anxiety disorders.
 Symptoms and Complications of Anxiety Disorders
 Many of the symptoms of anxiety are common among all types of anxiety disorders. Other symptoms more specific to a particular type of anxiety disorder. Listed below are some of the most common symptoms associated with each type of anxiety disorder.
 Panic attack or panic disorder involves sudden anxiety occur without warning. Symptoms can include chest pain, heart palpitations, sweating, shortness of breath, feeling of realism, trembling, dizziness, nausea, hot flashes or chills, a feeling of loss of control or fear of death. Panic attacks are very common - 10% to 20% of the population suffers from panic attack at some point in their lives. Some people begin to avoid situations that may lead to a panic attack, this attack is called a state of panic with agoraphobia. Panic attack usually lasts 10 minutes or less, but can last longer. Panic disorder is much less common. Panic disorder refers to frequent feelings of terror and fear, which come on the trigger can not be predicted without any clear.
 Phobias involve a fear of something, such as animals, storms, heights, or flying. Symptoms can include sweating, muscle tension, and dizziness. People also may go to extremes to avoid the situation that fear.
 Social anxiety, also known as social phobia, involves excessive anxiety in social situations, where people are afraid or embarrassed to ridicule. Situations that can lead to social anxiety and include small group discussions, dating, going to the party, and exercise. Common symptoms of social anxiety include redness, sweating, dry mouth. People with social phobia often avoid social situations that cause anxiety.
 Associated with generalized anxiety disorder (GAD) with the continuation of excessive worry and anxiety about a number of things (for example, work, money, children, and health). No specific source of fear. Symptoms may include muscle tension, trembling, shortness of breath, and focus rapid heartbeat, dizziness, dry mouth, nausea, sleep problems, and the poor.
 Obsessive-compulsive disorder (OCD), including repeated unpleasant thoughts (obsessions) and / or repetitive behaviors (motivation). Ideas may be connected to the repetitive behaviors. For example, people who are afraid of getting the infection always wash their hands. Sometimes, however, there is no connection at all between the thoughts and behaviors.
 Associated with post-traumatic stress disorder (PTSD) with great concern that appears after a traumatic experience. Symptoms usually begin within 3 months of the traumatic event, but it may take years to start. Can be associated with PTSD, sleep problems, nightmares, irritability, and anger. Feelings of guilt and unworthiness are common with PTSD. Painful experiences that can lead to PTSD include war, plane crashes, natural disasters (such as hurricanes and earthquakes), and crimes of violence (such as rape, assault).
 And often associated with complications of anxiety disorders or for lack of feelings of depression, because people with these conditions know their behavior is irrational and damaging to their lives. Depression is common, especially those who suffer from anxiety disorders.