Bloodsickness is a kind of hysteria, that is, due to contact with or see to smell the blood and produce a kind of consciousness and body of an overreaction. Consciousness of panic, palpitations, vertigo and other reactions, physiological and somatic manifestations of increased blood pressure, increased heart rate, regurgitation, limb weakness and so on.
Bloodsickness actually originates from conscious activity in the cerebral cortex. The brain sends out commands, prompting the secretion of relevant hormones, resulting in physiological and physical responses.