my mum who is in hers early 50s has suddenly lost a drastic amount of weight ( size 12 down to size 8 ) in a matter of a few months , she constantly shakes like a nervous anxious shake & never has any energy

she is always cold & very thirsty & now seems not to have an appetite .

iv advised her to visit the gp which she is in a weeks time

my mum has never dieted so that cant explain the weight loss im very concerned for my mum can anyone help.