Milk may be a consideration... If you only develop bloating after drinking coffee that contains milk or creamer, you may be lactose intolerant. Lactose intolerance is the inability to digest the sugar found in milk, which commonly causes bloating, gas and diarrhea. Bloating is a common symptom of caffeine overdose. Caffeine is a stimulant drug that can have a negative impact on the body when taken in excess. So, it's best to be aware of how caffeine is effecting your body and cut back on your daily intake of caffeine in general. You're over all health and your body will feel much better without so much caffeine in your system everyday and the chances of being bloated will be very slim to none as well.