Which condition is characterized by the body having more blood than normal?

Plethora is the condition that indicates an excess of blood in the body's circulatory system. It usually results in an increased volume of blood, which can lead to a range of symptoms and may occur in various clinical contexts, such as during certain diseases or physiological states. This condition is often associated with a plethora of blood vessels appearing engorged or distended.

In contrast, ischemia refers to a reduced blood supply to tissues, which can lead to cellular damage due to lack of oxygen. A thrombus is a blood clot that forms within a blood vessel and can cause blockages, potentially leading to reduced blood flow rather than an increase. Circulatory shock is a state where there is inadequate blood flow to meet the body's needs, resulting in insufficient oxygen delivery to tissues. Thus, plethora stands apart as the only condition directly related to having more blood than normal within the body.