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Pain is a general term that describes uncomfortable sensations in the body, ranging from annoying to debilitating. Pain stems from activation of the nervous system and is highly subjective.
Swelling occurs whenever the organs, skin, or other parts of your body enlarge. It is typically the result of inflammation or a buildup of fluid.
Cyanosis is condition in which a person develops a bluish tint to the skin, fingernails, and fingertips. It's caused by not having enough oxygen in your blood and can occur suddenly or over time due to chronic illness.