Not big. According to Baidu Health Information, Pericarpium Arecae is a kind of Chinese herbal medicine, which has the effects of promoting qi circulation, soothing the middle energizer, inducing diuresis and reducing swelling, and is used to treat abdominal distension, constipation and dysuria. It takes about 20-35g to decoct the peel with water, and it needs to be decocted according to the prescription prescribed by the doctor. Therefore, the amount of 30 grams of big belly decoction is not large.