In plain words
What an anxiety disorder is
Everyone feels anxious from time to time. An anxiety disorder is when worry, fear or the physical signs of anxiety are strong, last a long time and get in the way of work, relationships or daily life.
There are several types, including generalised anxiety disorder, panic disorder, social anxiety disorder, agoraphobia and specific phobias, and related conditions such as obsessive-compulsive disorder (OCD). Anxiety disorders are common, and they are usually treated with psychological therapy, lifestyle changes and sometimes medication.
This is general information, not a diagnosis. Source: Healthdirect: Anxiety.