Panic can show up as a fear of blood or hemophobia, trouble breathing, tremors in the limbs, nausea, dizziness, and even fainting when blood is visible in films or images. The core reason for this fear lies in the association between blood and possible injury, triggering the body to defend itself. This is explained by Ekaterina Demyanovskaya, a candidate of medical sciences and a neurologist at the Gemotest Laboratory (citation: Ekaterina Demyanovskaya, Gemotest Laboratory).
Experts note that strong emotions such as fear or horror trigger a surge of stress hormones from the adrenal glands into the bloodstream. These hormones influence the vagus nerve, which manages automatic bodily functions like heart rate and blood pressure (citation: Ekaterina Demyanovskaya, Gemotest Laboratory).
“As nerves become irritated, the heartbeat can slow and blood pressure may drop sharply. That reduction deprives the brain of essential nutrients and oxygen. The result is sudden weakness, dizziness, a sensation of seeing spots, and, if not addressed promptly, a loss of consciousness,” the neurologist explains (citation: Ekaterina Demyanovskaya, Gemotest Laboratory).
The doctor notes that this response is part of a vasovagal reaction, a physiological pattern that evolved in humans over time (citation: Ekaterina Demyanovskaya, Gemotest Laboratory).
“The mechanism behind the vasovagal reaction is not fully understood, but the sight of blood is believed to signal a potential injury. The autonomic nervous system sends a message that blood pressure should drop sharply so the body preserves blood for real injuries. People with hemophobia often faint, while those with other fears are less prone to losing consciousness,” the physician adds (citation: Ekaterina Demyanovskaya, Gemotest Laboratory).
She also emphasizes that such fainting is not dangerous in itself, though the situation can become risky if it happens in unsafe settings. For instance, fainting behind the wheel or without someone nearby to assist could lead to injury (citation: Ekaterina Demyanovskaya, Gemotest Laboratory).
To avoid fainting during a blood draw or similar procedures, experts suggest distraction and mental focus away from the process. Simple techniques can help maintain blood pressure, such as squeezing a rubber ball, repeatedly contracting and relaxing leg and hip muscles, or bending the head downward while seated to boost blood flow to the head (citation: Ekaterina Demyanovskaya, Gemotest Laboratory).
If fainting occurs, the recommended first aid is to place the person on a flat surface, elevate the legs with a small cushion, and ensure fresh air by opening a window and loosening tight clothing. Once consciousness returns, seeking medical evaluation is advised (citation: Ekaterina Demyanovskaya, Gemotest Laboratory).
In closing, fear and emotional responses tied to blood heighten the risk of a vasovagal episode, but understanding and practical steps can reduce the likelihood of injury during episodes. Emotions and fears can influence health in ways that are sometimes surprising, and awareness remains a key preventive tool (citation: Ekaterina Demyanovskaya, Gemotest Laboratory).