Thank you for the query.
Headaches, dizziness, cold can be caused by thyroid disease
as well as constipations. However it can be a result of low hemoglobin
level. Anemia associated with constipations and stomach aches should always be considered with possible colon cancer
. Especially if she is 50 or older.
She should have abdominal ultrasound, blood work, thyroid tests and colonoscopy
Hope this will help.