72 yrs old female has pain in lower back side of head, neck and upper shoulder areas. what could be causing this?

There are too many: possible causes of the symptoms you describe to be able to provide you with a diagnosis one the internet. The patient needs to be examined and perhaps have some testing performed in order to provide you with a diagnosis and management plan. Go see a health care provider for a check up.

Spondylosis: Very likely muscle spasms secondary to cervical spine spondylosis.