Caffeine is a stimulant and is used very often throughout the world. It can be found in many foods and beverages. It is mostly found in coffee, tea, and soft drinks. Caffeine is most consumed in coffee and tea, while the young ones tend to drink sodas or the soft drinks which also contains caffeine. It acts quickly that most people feel the effects of it as quick as thirty minutes. Since it is found naturally in foods and beverages and is considered a drug, it may cause addiction. However, as with other drugs, caffeine affects people differently depending on how much and how often they use.
If the certain person takes caffeine in moderation or in recommended amount, it will likely stimulate his or her nervous system and might probably boost the productivity without having any adverse effects. But if a certain person consumes excess amounts of caffeine, usually with sedation and or a rebound headache. A headache originates from behind the eyes and gradually spread to the forehead as it intensifies, becoming quite debilitating. In most cases, the caffeine-induced headache can trigger a migraine; thought for some people, it is moderately painful with varied severity. There are several different likely causes of a caffeine headache and it includes caffeine withdrawal, caffeine overdose, and frequency in caffeine consumption, caffeine allergy, and caffeine sensitivity.
Here are some of the top causes of a caffeine headache:
Caffeine withdrawal is the biggest cause of caffeine-induced headaches such that even a small decline of the caffeine daily intake could result in a mild headache. Caffeine withdrawal headaches can arise if a certain person misses a daily dose or consuming less of caffeine than they usually do. Withdrawal headaches can be very severe for people who quit caffeine and are usually accompanied by other equally debilitating symptoms which include fatigue, difficulty sleeping, flu-like symptoms, depression irritability, restlessness, indigestion and abnormal heart rhythms or palpitations.
Caffeine overdose is the next biggest cause of caffeine headaches. People who tend to consume excess amounts of caffeine in a limited amount of time experience a headache as a symptom of caffeine overdose. The first dose of caffeine usually has a positive effect in the body such that it decreases drowsiness. Increase mental alertness and improve muscle coordination. But high intake of caffeine or for those who are sensitive to caffeine, it can lead to many undesirable effects such as loud heart contractions(1), flushed face, increased heart rate, nausea and vomiting, diarrhea, dizziness, anxiety, irritability and of course the headache. Headaches resulting from caffeine overdose are referred to as rebound headaches. People who take caffeine infrequently- in a form of tea, coffee, soft drink or some other source tend to suffer more caffeine-induced headaches compared to those who take it regularly. There are also people who are allergic to caffeine because they are unable to metabolize it properly. The symptoms of allergic reaction to caffeine usually begin after consuming light to moderate amounts of caffeine in any forms. Those allergic reactions are the same of those in caffeine withdrawal and these symptoms usually arise due to the buildup of caffeine in the body rather than being digested properly.
Last is the caffeine sensitivity. This varies from person to person, depending on the efficiency of the body to process and metabolize the caffeine. Unlike caffeine tolerance, which the body responds to caffeine intake over time, caffeine sensitivity looks at the amount that can be safely consumed every day without negative effects. There are three levels of caffeine sensitivity depending on genetic makeup: Hypersensitive to caffeine, Normal sensitivity to caffeine and Hypersensitive to caffeine. Although there are three categories of caffeine sensitivity, they are not clear-cut. So one needs to identify his or her own response to different amounts of caffeine to avoid headaches from either withdrawal or excess consumption.
Article reference: (1) http://www.interactive-biology.com/3619/heart-contractions-simplified/