My dad is a heavy beer drinker and has been for many years. For more than 35 years he has had tremors or seizures not sure what that sometimes happen after 3 beers sometimes not till after 12 beers. They last for 5-30 minutes. His hands get stiff and his mouth won't move when he talks and his whole body shakes but his hands shake the worst. If we talk to him when it is happening he seems to work out of it faster but if he is alone it will go on for quite some time then all of a sudden it quits and he is fine then it happens again in a half hour or maybe several hours. He has been diagnosed with essential tremors but has been told they are different than the ones he has when he is drinking. Brain scan has been done and nothing found.