dark circles, in addition to a hint of eye bags, a combination which is suggestive of sleep deprivation and/or mental<unk> . One study concluded about 50% of people who have<unk>  receive a diagnosis that could explain the<unk>  after a year with the condition. In those people who have a possible diagnosis, musculoskeletal (19.4%) and psychological problems (16.5%) are the most common. Definitive physical conditions were only found in 8.2% of cases. If a person with<unk>  decides to seek medical advice, the overall goal is to identify and rule out any treatable conditions. This is done by considering the person's medical history, any other symptoms that are present, and evaluating of the qualities of the<unk>  itself. The affected person may be able to identify patterns to the<unk> , such as being more tired at certain times of day, whether<unk>  increases throughout the day, and whether<unk>  is reduced after taking a nap. Because disrupted sleep is a significant contributor to<unk> , a diagnostic evaluation considers the quality of sleep, the emotional state of the person, sleep pattern, and stress level. The amount of sleep, the hours that are set aside for sleep, and the number of times that a person awakens during the night are important. A sleep study may be ordered to rule out a sleep disorder. Depression and other psychological conditions can produce<unk> , so people who report<unk>  are routinely screened for these conditions, along with substance use disorders, poor diet, and lack of physical exercise, which paradoxically increases<unk> . Basic medical tests may be performed to rule out common causes of<unk> . These include blood tests to check for infection or anemia, a urinalysis to look for signs of liver disease or diabetes mellitus, and other tests to check for kidney and liver function, such as a comprehensive metabolic panel. Other tests may be chosen depending on the patient's social history, such as an HIV test or pregnancy test. Comparison with sleepiness<unk>  is generally considered a more long-term condition than sleepiness (somnolence). Although sleepiness can be a symptom of a medical condition, it usually results from lack of restful sleep, or a lack of stimulation. Chronic<unk> , on the other hand, is a symptom of a greater medical problem in most cases. It manifests in mental or physical weariness and inability to complete tasks at normal performance. Both are often used interchangeably and even categorized under the description of 'being tired.'<unk>  is often described as an uncomfortable tiredness, whereas sleepiness is comfortable and inviting. Measurement<unk>  can be quantitatively measured. Devices to measure medical<unk>  have been developed by Japanese companies, among them Nintendo (cancelled). Nevertheless, such devices are not in common use outside Japan.
Fatigue
Altitude sickness
Sedation
Idiopathic chronic fatigue
Personality changes
Neurosis
Somnolence
Anorexia 