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.