I ve had left chest , arm , armpit pain for several months. When I lay down for long periods or lift my arms at shoulder height or higher, the veins across my only my left side chest, down my arm and down my breasts stand out and are deep blue. My arm and armpit ache. Throughout the day my left arm aches most of the time. I m concerned I may have a partial occlusion. Physio, chiro, nothing helps.