What is a common characteristic of cyanosis?

Cyanosis is characterized by a bluish discoloration of the skin and mucous membranes, which typically arises from low levels of oxygen in the blood. When there is insufficient oxygen being delivered to the tissues, usually due to respiratory or cardiovascular issues, it can cause this noticeable change in color. Therefore, the presence of cyanosis effectively reflects a lack of oxygen in the bloodstream, leading to its identification as a significant clinical sign in various medical conditions.

In contrast, dehydration does not directly cause cyanosis, though it can lead to other complications. Infection might cause other symptoms or signs, but it does not specifically present as cyanosis. Lastly, a healthy state is generally associated with adequate oxygenation and blood flow, which would not display the bluish hue characteristic of cyanosis.