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An allergy is simply immunity fighting the wrong enemy. It can happen when a person's immune system reacts improperly to things which are usually harmless and treats them like parasites attacking the ...

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The endocrine system manages your hormones, and these in turn regulate your metabolism, growth, tissue function, and even your emotions. Glands located in many parts of the body produce hormones, whic...

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Genetic disorders are diseases caused by abnormalities in the genes or chromosomes. One large class of genetic disorders is metabolic disorders, also called the ‘inborn errors of metabolism’, when a s...

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Infectious diseases are caused by viruses, bacteria, fungi, protozoa, or multi-cellular parasites. Such diseases usually spread, with greater or lesser ease, from one person to another or even one spe...

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The brain is the center of the nervous system; the nervous system is a network of specialized cells that communicate information from the senses to the brain and from the brain back to the muscles and...