Side Effect of Caffeine

Caffeine Side Effects 
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Despite potential benefits as a memory-enhancer, the caffeine in coffee has some powerful side effects.

• Irritability

• Anxiety

• Restlessness

• Confusion

• Delirium

• Headache

• Insomnia

Muscular

• Seizures

• Trembling

• Twitching

• Overextension

Respiratory

• Rapid breathing

Urinary

• Frequent urination

Systemic

• Dehydration

• Fever

Visual

• Seeing flashes

Ears

• Ringing

Skin

• Increased sensitivity to touch or pain

Heart

• Rapid heartbeat

• Irregular rhythm

Gastric

• Abdominal pain

• Nausea

• Vomiting (possibly with blood)

Biology For A Changing World, W. H. Freeman (2013)