The latest Diagnostic and Statistical Manual of Mental Disorders (DSM-5) published by the American Psychological Association has listed a new condition, Caffeine Withdrawal Syndrome (CWS), that makes you feel out of sorts if you miss out on your coffee.
The manual lists CWS as a serious condition as people often struggle to overcome their addiction to caffeine with the body becoming used to regular caffeine consumption.
Some of the major symptoms of caffeine addiction include headaches, insomnia, lethargy, irritability, indigestion and constipation.
Jose Lemos, neurobiologist at University of Massachusetts, said that while the inclusion of caffeine addiction into the manual is controversial, it is a real condition that can have a negative effect on a person's ability to function. "When you withdraw caffeine — that's the controversy — then there are going to be more adenosine receptors than normal. Adenosine does a number of things including causing tiredness and allowing more blood to flow through the brain. If there is too much blood flow through the brain, it's like a migraine", he said.