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The physical effects of caffeine include lowered sensations of pain, less perceived effort, and increased muscle strength and endurance. However, at doses above ~400 mg, both cognitive and physical performance begins to worsen and symptoms of anxiety increase. [ 12 ]
Caffeine dependence can cause a host of physiological effects if caffeine consumption is not maintained. Commonly known caffeine withdrawal symptoms include headaches, fatigue, loss of focus, lack of motivation, mood swings, nausea, insomnia, dizziness, cardiac issues, hypertension, anxiety, and backache and joint pain; these can range in severity from mild to severe. [18]
In chronic psychiatric patients, caffeine, the major active ingredient in coffee, is associated with anxiety. [31] [32] At high doses, typically greater than 300 mg, caffeine can both cause and worsen anxiety. [33] For some people, discontinuing caffeine use can significantly reduce anxiety. [34]
Researchers say consuming more than 400 milligrams of caffeine per day could raise the risk of cardiovascular disease. Excessive caffeine from coffee, tea, energy drinks, and other beverages may ...
And a compressed nerve in your middle back area can cause pain in the ribcage, says Standaert, who specializes in the non-operative management of spine and neuromusculoskeletal conditions.
Whether caffeine can help treat Parkinson’s is an open question. A recent study, which appears in the journal Annals of Neurology , concludes that caffeine does not improve symptoms.
Caffeine-induced psychosis is a relatively rare phenomenon that can occur in otherwise healthy people. Overuse of caffeine may also worsen psychosis in people suffering from schizophrenia . [ 1 ] It is characterized by psychotic symptoms such as delusions, paranoia, and hallucinations.
In severe cases, too much caffeine can lead to seizures or cardiac arrest. In milder cases, too much caffeine can cause dehydration, upset stomach, sleep changes, headaches and jumpiness.