### condition | disorder | metabolic disorder:

Phenylketonuria
* now causes few cases of mental retardation.
+ Birth defect, Genetic defects, Lethal or damaging genes: Health problems
  * In the case of a chemical deficiency, the problem may be curable. For example, phenylketonuria was a cause of mental retardation. Doctors came up with a simple test to find which babies have this condition. They found that if these children got treated and followed a strict diet, they could get enough of the chemical they needed. Phenylketonuria now causes few cases of mental retardation.

### condition | disorder:

Mood disorder
* affect a wide variety of people.
* are among the most common and most treatable of all mental illnesses
  - biochemical in nature, just like diabetes, and are just as treatable
  - highly treatable - but often go undiagnosed
* are more common in married people
  - single, divorced and separated people
  - one form of serious mental illness
  - some of the most treatable of all mental illnesses
  - uncomfortably common
* can also co-exist with other problems such as anxiety or attention deficit disorder
  - be a very isolating illness
  - cause major turmoil for the individual, family, and school
  - have a negative effect on how mothers interact with their babies
* can make a person feel fatigued, worthless, helpless and hopeless
  - achieving in school difficult
* cans have impact
  - negative impact
* involve disturbances in emotional, cognitive, behavioral, and somatic regulation
  - intense moods which last for longer than normal periods of time
  - responses in emotional, cognitive, and behavioral regulation
  - serious morbidity and a substantial risk of death
* is also a symptom of age-related memory change
  - diseases
* share many similar symptoms with fibromyalgia and visa versa.
* take on a different form in the young.

Movement disorder
* Many movement disorders are familial and have an underlying genetic basis
  - inherited, which means they run in families
* Most movement disorders are chronic and progressively disabling.
* Some movement disorders progress over time while others improve or remain unchanged.
* can also occur during alcohol abuse and withdrawal
  - vary considerably from child to child
* suggest extrapyramidal system dysfunction.

Muscle disorder
* Most muscle disorder causes symptoms.
* Most muscle disorder is caused by defects
  - characterized by weakness

Musculoskeletal disorder
* Some musculoskeletal disorders respond best to treatment in the early stages of the disease.
* are a main cause for early retirement and work incapacity.
* are common among drummers, pianists, string players, and others
  - and costly conditions that occur in many different businesses
* lead to pain and suffering and result in high costs to industry.
* vary greatly in severity and degree of permanence.
* waste time and money.

Nervous disorder
* Some nervous disorder occurs in birds.
* is disorder

Neurological disease
* Many neurological diseases are also directly related to aging
  - can affect humans
* Some neurological diseases are caused by ingestion.
* affect several million people in the United States.
* are illnesses.
* can present as lameness, weakness, paralysis, seizures, or behavioral changes.
* is disorder
* structural disturbance or a malfunction of the central nervous system.