Anyone have any experience of this? My dad (78) has various chronic illnesses and is on lots of medication. He has always been a bit of a mutterer but has been getting worse and worse at this and swears, just about under his breath, though audibly, a lot. Not quite all the time but enough to worry me and has definitely deteriorated in the last 6 months. It doesn't seem to be related to his mood as he will answer questions or engage in conversation perfectally genially immediately after an episode. When he is on his own in the room the volume goes up and he starts shouting a stream of swear words. He also sits banging the arm of his chair with a clenched fist at the same time. He does it sitting in his armchair while watching the telly, in the car and at the dinner table. Have had a quick look at the internet but not found anything useful yet.