A herpes culture (or HSV DNA testing) may be ordered when someone has a blister or vesicle on their genitals. HSV DNA testing is ordered when a person has encephalitis that the doctor suspects may be caused by a virus. HSV testing may be ordered regularly when a pregnant woman has herpes.
Caffeine stimulates the central nervous system and can produce restlessness, headaches, and irritability. caffeine also elevates your heart rate and blood pressure. Over the long-term as your body gets used to caffeine, it requires higher amounts to get the same effects. Certainly, having your body in a state of hormonal emergency all day long isn't very healthy.
How Caffeine Affects the Nervous System. A cup of coffee on a table. Caffeine, chemically known as 1,3,7-trimethylxanthine, is considered to be the most popular, largely unregulated drug in the world. Caffeine is consumed in coffee, tea, cocoa, chocolate, many soft drinks and some drugs. Natural sources of caffeine include coffee beans, tea leaves, kola nuts, guarana berries and cacao pods. Like every drug, caffeine affects the nervous system in multiple ways, some of which are desirable, but many of which are unwanted.