Caffeine is a naturally occurring substance found in the seeds and leaves of a variety of plants. Because of its stimulating effects this compound is classified as a drug and when used in moderate dosages it may increase alertness and temporary elevate mood and energy levels. While caffeine is known to have beneficial qualities for your body, excessive amounts of this compound can cause adverse side effects such as numbness. If you feel you have overdosed on caffeine or are experiencing negative side effects, immediately contact your doctor or seek medical attention.
How It Works
Caffeine is a member of the xanthine chemical group, and it works by interfering with brain adenosine sites. Adenosine is responsible for triggering sleepiness, and as you are awake adenosine begins to accumulate in your brain. Since caffeine blocks adenosine-receptor sites, this sleep-inducing chemical is unable to become active, which results in a decrease in tiredness and an increase in energy. Along with its inhibitory actions, caffeine also stimulates your central nervous system creating a temporary increase in alertness; however, due to its effects fine motor skills are reduced.
Causes of Numbness
When consumed in moderate amounts, caffeine is generally considered safe for most adults. However, if you are sensitive to caffeine or ingest higher concentrations, negative side effects will occur. The severity of side effects is dependent on how your body processes caffeine and the amount taken. Numbness is a common sign of a serious reaction to caffeine, and it may occur if you overdose on this substance.
If you have generalized anxiety disorder, the cause of numbness may not be from caffeine overdose but rather side effects from the stimulating effects of caffeine. Johns Hopkins Bayview Medical Center reports caffeine can exasperate anxiety symptoms in those who already suffer from this psychiatric disorder. Because caffeine can induce anxiety or a panic attack in vulnerable individuals, sensations of numbness may be contributed to a caffeine-induced anxiety attack.
Suggested Daily Intake
The McKinley Health Center states up to 300 mg of caffeine per day is classified as a moderate intake, and when consumed in lower levels the risk of side effects are reduced. However, the appropriate dosage may be much lower if you are sensitive to caffeine or stimulants. Because the recommended daily intake is solely based on your individual tolerance level, ask your physician for guidance about your caffeine consumption.
Considerations
If you have anxiety or suffer from panic attacks, do not consume more than 200 mg of caffeine per day as studies have shown this amount may trigger anxiety or panic attacks. Consider avoiding caffeine and other alkaloid stimulants altogether to prevent unwanted side effects. Because numbness is a sign of caffeine overdose, immediately seek medical attention if you feel you have consumed an excess amount of caffeine
References
- KidsHealth; Caffeine; Mary L. Gavin, M.D.; January 2008
- "Annals of Medicine" Journal; Adenosine in Sleep and Wakefulness; T. Porkka-Heiskanen; April 1999
- McKinley Health Center; Caffeine; May 2010
- Johns Hopkins Bayview Medical Center; Information About Caffeine Dependence; July 2003
- FamilyDoctor.org; Anxiety and Panic: Gaining Control Over How You're Feeling; November 2010
- Drugs.com: Caffeine Side Effects
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