Any encounter with blood, experiencing or viewing injections with needles, or anticipating/experiencing injury or invasive procedures results in this phobia.
The body and psychological experience differs from other phobias since it has almost instant onset and physiological effects.
Heart rate and blood pressure falls, blood is diverted and pooled in muscles and organs and syncope (fainting) is the consequence. Avoiding medical procedures or viewing them even on TV, results.
Fear of Blood (Haemophobia). The sight of blood often leads to fainting.
Fear of Needles (Trypanophobia) or needle-related procedures.
Fear of Medical or other interventions which may lead to physical injury or harm.