The term panic attack is somewhat more precisely defined, and usually includes a constellation of physical symptoms:Definitions of anxiety attack on the Web:
an episode of extremely uncomfortable anxiety. Severe forms of anxiety attacks are usually called panic attacks.
a sudden acute episode of intense anxiety and feelings of panic
Definitions of panic attack on the Web:
is an intense and sudden feeling of fear and anxiety. It is associated with many physical symptoms such as rapid heart beat, trembling, rapid shallow breathing, pins and needles in the arms and feeling faint. Many people who have a panic attack fear that they will collapse or die. These attacks are not harmful and usually go away within 20-30 minutes.
A sudden episode consisting of terrifying bodily symptoms such as labored breathing, choking, dizziness, tingling in the hands and feet, sweating, trembling, heart palpitations, and chest pain. Panic attacks occur in a number of mental disorders and are common in phobias, panic disorder, and post-traumatic stress disorder (PTSD).
an episode of panic that resembles an extreme form of anxiety attack and may sometimes result in temporary paralysis or fainting. People often describe a panic attack as, "a frantic feeling that I am about to die." Sensations of horror or terror can be extremely acute during a panic attack, to the degree that a person may fear going insane as a result. In panic disorder, such attacks typically last about half an hour; however, in extreme cases attacks may last several hours or even several days (Status Panicus).
A period of sudden, intense apprehension, fearfulness or terror often associated with impending doom and accompanied by physiological symptoms, such as shortness of breath, palpitations, pounding heart or chest discomfort.
A panic attack is a period of intense fear or discomfort, typically with an abrupt onset and usually lasting no more than 30 minutes. Symptoms include trembling, shortness of breath and sensations of choking or smothering. The disorder is strikingly different from other types of anxiety in that panic attacks are very sudden, appear to be unprovoked, and are often disabling.