Reference no: EM133315898

Natalie is a 17-year-old Caucasian female with no previous psychiatric history and is not on any medications. However, there is a history of depression and a history of denied substance use for her and her family. Patient is a student. Reports she is not feeling "great and not doing so well" Patient reports gaining ten pounds and not sleeping well at night. She reports sleeping through five of her classes. She reports having difficulties concentration, experiences behavioral changes in the Fall and Winter and loses interest in the activities she enjoyed with great pleasure, such as hanging out with her friends. Some of the behavioral changes noted include difficulties concentrating, issues with sleep, and isolating herself by staying indoors. The changes are seriously affecting her life enough to raise concern in her mother. She has been isolated from friends, appears depressed, sleeping more, decreases her energy level, no longer enjoys pleasurable activities, dislikes snow and cold weather. She is here today because her mother is worried about her behavioral changes that occur only during this time of the year.

Question

Give three differential diagnosis in order of priority for this scenario.