David O. Chastain, MD | Adolescent Medicine

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David O. Chastain, MD | Professor 


Medical Education:
 University of Mississippi Medical Center, MD, 1978 
Residency:  Keesler USAF Medical Center, 1978-81  
Fellowship:  Fitzsimons Army Medical Center, 1985-87; Colonel, USAF, Wilford Hall Medical Center 


Invited presentations

  • Adolescent Misadventures: update in STI screening and Treatment. Tennessee State Pediatric Conference, Franklin, September 2014.
  • Adolescent medicine: an introduction. ETSU Department of Medicine Education Conference, ETSU Stanton –Gerber Hall, April 2015.

What is the proper age range for adolescence? Adolescence generally ranges from the last years of elementary school until graduation from high school. Patients have generally entered puberty, which typically begins between the ages of 9 to 11 for girls, and 11 to 14 for boys. Adolescent medicine incorporates aspects of gynecology, endocrinology, sports medicine, nutrition, dermatology and psychology. 

Some adolescent issues can include:

  • Sexually transmitted disease (working with specialists in pediatric endocrinology, adolescent obstetrics and gynecology, immunology infectious diseases, and urology and reproductive medicine)
  • Unintended pregnancy (working with specialists in adolescent obstetrics and gynecology, especially in neonatology and maternal-fetal medicine; many- though not all- are medically risky or high-risk cases and/or to those with psychosocial, environmental, and socioeconomic challenges)
  • Birth control (there is currently a drive in the United States federal government's health care policy making to ensure access to any and all prescription or non-prescription contraceptive methods to adolescent minors who request them, especially if they are over a certain age)
  • Substance abuse
  • Menstrual disorders
  • Acne (working with specialists in dermatology who treat adolescents)
  • Eating disorders like anorexia nervosa and bulimia nervosa
  • Certain mental illnesses (especially personality disorders, anxiety disorders, major depression and suicide, bipolar disorder, and certain types of schizophrenia)
  • Delayed or precocious puberty (often working with specialists in adolescent pediatric endocrinology, urology, and andrology)
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