because you drink lots of it.
Because alcohol act like a diuretic, that is is causes your body to release more water then it normally would. this is also why you have hang overs, as a result of dehydration.
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that happens to me also, its probably an allergic reaction to the grains or yeast
Drinking any liquid will cause urination, but people tend to drink beer in excess, and therefore, they urinate often while drinking it.