Fatigue:

Fatigue is a common health complaint by individuals. Fatigue is also referred to as feeling weary, tired, exhausted, lethargic, and a lack of energy. There are several causes of fatigue from sleep disturbances to some diseases or conditions. Treatment of fatigue is generally directed toward the condition or disease causing fatigue.

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Doctor's Notes on Fatigue Symptoms

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Mountain Sickness

Altitude sickness (mountain sickness) is caused when a person's body is not able to adjust to a higher altitude. Acute altitude sickness symptoms fatigue, headache, dizziness, insomnia, nausea, decreased appetite, edema, and social withdrawal. Most cases of altitude sickness are resolved by going to a lower altitude. Altitude sickness can be severe and life-threatening if it progresses to high altitude pulmonary edema (HAPE).
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Understanding Antidepressant Medications

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Grief and Bereavement

Grief is our personal experience of loss. Mourning is a public expression of our grief. Bereavement is the period after a loss during which mourning occurs (usually a relatively brief time) and grief is experienced (often for a much longer time).
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Carbon Monoxide Poisoning

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Chronic Fatigue Syndrome

Chronic fatigue syndrome (CFS) can also be called "systemic exertion intolerance disease," and it has no known cause. The condition is characterized by severe lethargy for more than a day after exercise or exertion. Sufferers may have a sore throat, tender lymph nodes, short-term memory problems, and grogginess even after sleeping, among other symptoms.
Coronary Heart Disease

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Chronic Pain

Chronic pain is pain that persists for a period of six months or longer, and is the result of a long-standing medical condition(s) or damage to the body. Common sources of chronic pain include headaches, back pain, and arthritis. There are several types of pain including general somatic pain, visceral pain, bone pain, muscle cramps, neuropathy, circulatory problems, and headache pain. Chronic pain may be managed with over-the-counter or prescription medications.
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Disorders That Disrupt Sleep (Parasomnias)

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Dizziness

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Fainting

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Heat Exhaustion

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Sleep and Sleep Disorders in Children

Sleep and sleep disorders may be affected by a variety of factors. Learn about the different types of sleep disorders as well as symptoms, causes, diagnosis, and treatment.