Caffeine can temporarily boost energy, but some people may experience intolerance. Common symptoms include:

Headaches – Dehydration or caffeine withdrawal can trigger headaches or migraines.
Dry, Flaky Scalp – Caffeine-induced dehydration may dry out the scalp, causing flakiness.
Restless Legs – Excess caffeine can overstimulate the nervous system, leading to jittery or restless legs, especially at night.

Midday Energy Crashes – After an initial surge, caffeine can result in sudden energy drops.
Frequent Stomach Issues – Some people may experience bloating, cramps, or diarrhea due to caffeine irritating the digestive system.
Constant Thirst – Caffeine’s diuretic effect can make you feel thirsty even with adequate hydration.
Coating on Your Tongue – Caffeine’s acidity may cause a greenish coating on the tongue, indicating digestive problems.
Swelling – In some cases, caffeine intolerance can trigger swelling or puffiness due to immune reactions.
Increased Anxiety – Caffeine can overstimulate the nervous system, leading to heightened anxiety or nervousness.
Muscle Twitches or Spasms – High caffeine consumption may cause muscle twitches due to electrolyte imbalances.
If you experience these symptoms, reducing caffeine intake could improve your overall health.