My 88 year old father has been having some abdominal tremors when he is lying on either of his sides. He is pain free, but this symptom awakens him when he is trying to sleep. Xray showed some degenerative disease in his lower thoracic and lumbar spine. It sounds like it might be neuro to me, but would love a definitive answer.
So sorry about your Dad. Some older people just tremble all the time. I think it's because the muscles are weak. (My mom's mouth and jaw tremble - she's 94). Magnesium might help some as it's necessary for good muscle tone. - Sounds like you're taking good care of your Dad. :)
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