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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.