A limited symptom attack (LSA), also referred to as a limited symptom panic attack (LPA), is a milder, less comprehensive form of panic attack, with fewer than 4 panic related symptoms being experienced (APA 1994). For example, a sudden episode of intense dizziness or trembling accompanied by fear that something terrible is about to happen. Many people with panic disorder have a mixture of full blown and limited symptom attacks. LSAs often manifest in anxiety disorders, phobias, panic disorder and agoraphobia. However, experiencing an LSA is not necessarily indicative of mental illness. Often persons recovering from and/or being treated for panic attacks and panic disorder will experience LSAs.

is there such thing as a mild panic attack?
yes