what is anxiety disorder. types, symptoms and causes

Actually these are the emotions that cover man from childhood while man doesn't have his consciousness and these emotions make man mentally healthy or sick. Its a mental disease in which man keep thinking of infirmity, even he gets so frustrated that he can't think to do something good or to go ahead.
Some Psychologists call it reminder of old happenings which were not pleasant.
Two moments are very important for it. First is failure in sex and second is abortive performance in job.
           
 Symptoms
Motor tension  signs:
Quiver, jitters in organs and tiredness
Psychological signs:
Fast heart beat, Discomfort, chest strain, sweat on the palms of hands.
When these signs remain for several weeks then the condition called anxiety disorder.
If it remains for six months it became Generalized anxiety and know it, that these signs reached the maturity limit. It can be in any part of the age. Period of puberty looks like suitable for it.
                                                                      Causes
Psychological:
    As mentioned above when an unbearable passion is deprived, it takes shape of Anxiety.
Biological:
      When Neuron transmitters decreases. Second, there is a substance in the brain that is called Locus Ceruleus. It is also responsible for this disease. If we stimulate it by taking medicines then it creates fear and anxiety.