he showers everyone with spittle when he speaks

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I have known this man only casually, I haven't really talked to him face to face, but I only see him everywhere and out of recognition because our city is just a small city, sometimes we'd nod or wave at each other. The other day I met him in one office and we happened to be looking for the same person. While waiting for the person, we had a little conversation and I noticed that he is quite talkative and when he speaks saliva would sprinkle everywhere. In fact I noticed that he actually is producing lots of saliva and they would form at the sides of his mouth, but he still keeps on talking. It wasn't a pleasant sight to be seeing froth gathering at the sides of his mouth while he speaks. I wonder if you have met anyone like this. Does he have any health issue, this man? Why does he seem to be producing lots of saliva in his mouth? What sort of condition is this?