Hello,Rashid sahab I have got your question.I will try to explain this as per my knowledge.Your mother is diabetic,cardiac patient and also having spondylosis
.This type of pain you described may be of cardiac origin which increases on exertion.that is a part.But,it may be due to diabetes
also.Sometimes in diabetic patients ,nerve
may be compressed in our hand that is called carpal tunnel syndrome
.that pain starts from 1st 3 fingers of our hand and goes upwards.I think that may be a cause.So at first you go to your doctor.tell the problem and take his/her advice.thats all.I wish your ammijaan a long healthy life.thank you.