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Fatigue

Everyone feels lethargic, weary, tired, or exhausted at some point in their lives. All of these terms can be used interchangeably to define fatigue, which basically means the experience of the lack of energy that is necessary to optimally perform routine tasks. Fatigue is not synonymous with drowsiness. Drowsiness is an intense desire to sleep whereas fatigue is characterized by low energy or an overall lack of motivation.

Approximately twenty percent of Americans complain of intense fatigue that interferes with their day-to-day lives. Fatigue is a difficult condition to diagnose and treat. It is important to determine the cause of chronic fatigue before beginning a treatment plan.


Causes and Risk Factors

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Fatigue can be caused by physical or medical as well as emotional or neurological causes. An estimated twenty to sixty percent of total cases of fatigue are caused by physical factors and approximately forty to eighty percent of total cases of fatigue result from emotional causes.

Physical or medical causes

Sleeping disorders including insomnia, sleep apnea, excessive sleep, and irregular sleeping habits
Heart diseases such as congestive heart failure or cardiomyopathy
Lung diseases such as asthma, Chronic Obstructive Pulmonary Disease (COPD), and pneumonia
Nutritional disorders such as obesity, malnutrition, and vitamin or mineral deficiency
Endocrine disorders such as diabetes, hypoglycemia, and thyroid disorder
Gastrointestinal disorders such as Gastroesophageal Reflux Disease (GERD) and peptic ulcers
Infectious diseases such as tuberculosis, urinary tract infections, mononucleosis, hepatitis, HIV/AIDS, and other chronic diseases
Connective tissue disorders such as arthritis, lupus, and fibromyalgia
Other conditions such as cancer, anemia, pregnancy, and menopause
Change in physical activity pattern such as excessive exercise, lack of exercise, or excessive manual labor

Emotional or neurological causes

Neurological disorders such as multiple sclerosis and Lou Gehrig disease
Psychological issues such as depression, stress, anxiety, and grief
Side effects of certain medications such as beta-blockers, ACE inhibitors, calcium channel blockers, heart medications, psychological medications, muscle relaxants, and diuretics
Pain killers, especially opiate-based drugs
Narcotics or stimulants such as nicotine, recreational drugs, and alcohol
Other causes such as jetlag and work pressure

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