If a woman has cyclical Breast pain, does she need an ultrasound? 

Probably not.

Cyclical breast pain, in a pre or peri-menopausal woman is probably benign and related to breast parenchymal response to hormonal changes.

If the pain does not coordinate with menses, a cyst or other structure could cause pain, in which case an ultrasound, or other imaging would be helpful.

Breast pain is not a common indicator of breast cancer.

More information here: 

webmd.com breast pain or mastalgia

Radiology is a very large and ever changing field and this post is to help your provider.  When combined with a thorough history and physical exam, this information can be very useful.  Your provider is best suited to answer specific questions regarding this post.

A provider is usually a Nurse Practitioner, Physician’s Assistant or Medical Doctor.

Of course, this is not a substitute for medical care.