Anorexia is an eating disorder concerned with the loss of appetite due to a fear of gaining weight. Anorexia usually starts in the teen years. Early treatment can be very effective. If it is not treated early, anorexia can become a lifelong problem. Untreated anorexia can lead to starvation and serious health issues.

Eating disorders are complex, and experts don't really know what causes them.

You may be more likely to have anorexia if:
Other people in your family are obese, have an eating disorder, or have a mood disorder such as depression or anxiety.
You have a job or do a sport that stresses body size, such as ballet, modelling, or gymnastics.
You are the type of person who tries to be perfect all the time, never feels good enough, or worries a lot.
You are dealing with stressful life events, such as divorce, moving to a new town or school, or losing a loved one.

People who have anorexia often strongly deny that they have a problem. They do not see or believe that they do. It is usually up to their loved ones to get help for them

If you have anorexia and are taking medicine, you must have regular checkups. Being malnourished or severely underweight can change the amount of medicine in your body. Too much or too little can be dangerous.