http://en.wikipedia.org/wiki/Anxiety

http://www.anx.com/

http://www.answers.com/topic/anxiety

http://www.adaa.org/

http://www.medicinenet.com/anxiety/article.htm

http://www.webmd.com/anxiety-panic/default.htm

http://familydoctor.org/013.xml

http://www.emedicinehealth.com/anxiety/article_em.htm

http://www.nlm.nih.gov/medlineplus/anxiety.html

http://www.webmd.com/anxiety-panic/guide/mental-health-anxiety-disorders