What Causes Itching All Over Body?

Hi, my mother in law (just turned 70) started itching again all over her body as it happened before 20 years ago. As before, today our family is going through very difficult, emotional, stressful time with a lot of tears, sleepless nights etc. ... 20 years ago the only thing that helped my mother in law was non-traditional needle therapy done by one of the chinese doctors. The result was fast and amazing and lasted for 20 years. I am sure, for this period of time medicine has progressed. Can you, please, suggest anything to help?