Black tea is hygienic for human health due to high quantity of caffeine.
Headache , Nervousness and sleep problems due to the presence of caffeine in black tea when we are drinking in more concentration.
Vomiting , diarrhea and irritability due to the caffeine.
All these diseases like irregular heartbeat , tremor , heart burn ,dizziness, ringing in the ear , convulsions and confusion occurs due to more drinking of black tea( drinking 5 to 6 cups of black tea daily are very bad for health).
Inshort large amount of caffeine causes death or other severe side effects on human health.
Therefore we should drink one or a two cups of black tea per day.Small amount of caffeine is probably safe for our health.
