Fatigue
* can aggravate breast infections
  - also accompany depression and anxiety
* can also be a nonspecific symptom of a psychological or physiologic disorder
  - symptom of illness
  - responsible for tension-type headaches
  - have an overall effect on the patient's ability to cope with cancer
  - result from the stress of dealing with the diagnosis and treatment of cancer
* can be a disabling side effect of cancer, cancer treatments and dealing with pain
  - possible symptom of sleep apnea in perimenopausal women
* can be a sign of anemia
  - virtually any illness
  - symptoms of blocked arteries but is rather non-specific
  - either acute or chronic
  - more than just a feeling of being constantly tired
* can be the first sign of an opportunistic infection
  - most debilitating aspect of fibromyalgia
  - become a very important issue in the life of a person with cancer
  - disrupt the arrangements of the atoms in the material
  - exacerbate motion sickness
  - have many causes
  - increase pain
* can lower motivation and negatively affect job performance and personal relationships
  - impact job performance and personal relationships
  - make people appear lazy, disinterested or irritable
* can occur at any time of day
  - because of interrupted sleep
  - often cause affected people to stub their toes and fall
  - on occasion be a symptom of cancer
  - only further weaken the immune system
  - pose a number of obstacles to coping with cancer
* can prevent a person from functioning normally and affects a person's quality of life
  - normally and impacts a person's quality of life
  - result in poor performance due to lack of coordinated body movements
* can seriously effect their health and quality of life
  - limit a person's ability to work, go to school, and maintain relationships
  - slow reaction time, impair memory, and even cause hallucinations
  - sometimes bring out the best in a person
  - start and increase very slowly
  - weaken one s sexual desire
* creates natural impulses to sleep and minimize physical activity.
* has a profound impact on a woman's recovery from hysterectomy.
* is also a common indicator of pregnancy
  - problem during the early and late stages of pregnancy
  - symptom of depression
  - contributor to traffic accidents
  - known to cause Tinnitus noise to worsen
  - subtle symptom of decompression sickness
  - related to pain and is worse when there is inadequate pain control
  - the primary side effect of radiation
  - only one of several possible symptoms of pernicious anemia
  - referred to as overusing the body in and becoming exhausted
* is the main symptom of both iron deficiency and anemia
  - major cause of connecting rod failure
  - second only to alcohol as a cause of vehicle-related deaths
* is, after all, a physiological condition.
* seems to also contribute to cramps
  - play a role in vocal cord weakness

### fatigue:

Acute fatigue
* can be a protective body function, alerting a person to rest.
* is generally short-lived, sudden in onset, and relieved by rest.

Driver fatigue
* factor in up to one third of all fatal crashes.
* foreseeable risk for all drivers.
* is associated with truck crashes
  - recognised as a contributory factor in some accidents
* is the most common cause of traffic crashes caused by driver inattention
  - top cause of accidents involving trucks
* ranks as the most frequent cause of accidents resulting from inattention.