answer:I have had breast cancer. There was never any breast pain, rib pain, collar bone pain, the feeling of swelling under my ribcage, shortness of breath and dizziness. Those are symptoms often of panic attacks. A small collection of cancerous microcalcifications were detected in my routine yearly mammogram. They caused no sensation whatever anywhere in my body. Have you thought about yoga, meditation, and deep breathing exercises to combat the anxiety? You are not a crazy freak but you are making yourself crazy. The Mind-Body Connection (I am unaware of cancer of the muscles (“A tumor growth in the skeletal muscles is a rare condition, and it will in most cases involve a benign tumor.”)