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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.

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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.

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A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.

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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.

Organs of the urinary system. This illustration is an anterior view of a female with the abdominal w Organs of the urinary system. This illustration is an anterior view of a female with the abdominal w
The respiratory system. The respiratory system.
Localizing the Source of High-Frequency Sounds Localizing the Source of High-Frequency Sounds
Integumentary system & Skeletal system Integumentary system & Skeletal system
Physics - Pressure, Density, Pascal's Principle Physics - Pressure, Density, Pascal's Principle
Pathway by which the nervous system controls skeletal muscle contraction Pathway by which the nervous system controls skeletal muscle contraction
Video: Skin Cancer

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