Not sure if I’m in the right forum or not. The muscles get rigid and it is painful and can last up to a minute. It’s like an entire body stretch/stiffness that is involuntary. Sometimes this happens on its own and at other times when he is touched. It doesn’t happen always but nearly once a day and the duration seems to be getting longer. He has not been diagnosed with Parkinson’s disease but shows symptoms. Anyone have any idea what this is or have experience with it?
That sounds like the muscles are locking up - I have a friend and that used to happen to her legs all the time.
Talk to his doctor. I don't know if Physical Therapy might help, but ask about it.
I think it's great that you are asking for input on the forum, sort of like crowdsourcing for medical diagnoses.
A lot of people have been helped with rare disorders through such groups.
I am sure you have already mentioned this to the doctor.
It can be frustrating when you mention a symptom but the medical staff can not seem to find a cause.
Also, there are a lot of people with medical backgrounds who post on forums.
I have actually read several times about people who got answers on line, when the doctors they were seeing seemed stumped.
There is lots of wisdom to mine in massive crowds.
I hope you find your answer.
Your dad is lucky to have someone like you who has the intellect and intellectual curiosity to be proactive and seek their own answers rather than being slavishly and naively obedient to doctors only.
My mother was once experiencing fatigue and leg weakness that caused frequent falls.
It came on suddenly, but her doctors did numerous tests and said there was nothing found.
It turned out she was recently put on Metformin. Metformin is known to deplete b12 and worse many elderly lack the intrinsic factor that converts b12 to the active easily absorbed form.
I put her on Methylcobalamin (active b12) and a within days her symptoms resolved.
All her doctors had missed this very simple solution.