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Anorexia Nervosa
Anorexia Nervosa is an illness that mainly affects adolescent girls although in recent years there has been a rise in the number of boys being diagnosed with the disorder. The mostcommon features are loss of weight and a change in behavior in which the weight loss may become severe and life threatening. Personality changes will be those of increasing seriousness andintroversion and an increasing tendency to become obsessional. She/He will usually begin to lose contact with her friends, regress and appear to lose confidence. She/He may become less assertive, lessargumentative and more dependant The disorder, which usually begins in young people around the time of puberty, involves extreme weight loss; at least 15 percent below the individual's normal body weight. Typical symptoms are:
The patient will not maintain a minimum body weight (for example, 85% of expected weight for height and age).
Despite being underweight, the patient intensely fears becoming fat.Self-perception of the body is abnormal, shown by at least 1 of:
Unduly emphasizes weight or shape in self-evaluation.
Denies seriousness of low weight.
Has a distorted perception of own bodyshape or weight.
Due to weight loss, a female patient has missed at least 3 consecutive periods (or periods occur only  when she is given hormones).
Potential Medical Complications: 
Dry skin,Hypothermia, Bradycardia, Hypertension, Dependent Edema, Anemia, Lanugo, Infertility, Osteoporosis, Cardiac Failure, and Death (most commonly results from starvation, suicide, or electrolyte imbalances).Associated Features:
Depressed Mood
Somatic or Sexual Dysfunction
Guilt or Obsession
Anxious or Fearful or Dependent Personality
Differential Diagnosis:

Some disorders display similar orsometimes even the same symptom. The clinician, therefore, in his diagnostic attempt has to differentiate against the following disorders which one needs to be ruled out to establish a precise diagnosis....