Just about any medical doctor can treat low sodium but the one most likely would be one who has specialized in internal medicine.
what kind of doctor treats symptoms of sciaticia
Dermatologist treats that condition
I think its an orthapeadic doctor
The Dermatologist (skin doctor)
Foot doctor
an oncologist
An Orthopedist.
A psychologist.
gastroenteroligist
nuerologist
Dermatologist treats your skin diseases.
A gastroenterologist treats stomach pain.