People under what situations are avoid green tea?

Caffeine sensitivity. Green tea is generally quite safe but has caffeine (unless decaffeinated) so should be avoided by those who are sensitive to or who might be adversely affected by it- this includes those with anxiety, high blood pressure, palpitations and glaucoma. It may also interact with certain drugs such as Coumadin (warfarin) and theophylline. See http://cancer.Emedtv.Com/green-tea/green-tea-drug-interactions.Html.