Upper back pain (in the thoracic region of the spine, below the neck and along the length of the ribs) is often the result of poor sitting or standing posture, or is due to minor trauma from playing sports or exercising. The pain is often characterized as achy and sore to the touch, which typically indicates a muscle strain.  Muscle strains often respond well to rest or other home treatments and resolve within a few days. If your upper back has sharp and/or burning pain which persists for more than a week of self-treatment, seeing a healthcare professional is recommended. 
Bleeding can result from this combination of high internal pressure and vessel wall weakness. Such hemorrhages are often microscopic in size, causing limited damage and few significant symptoms. Even many nonsymptomatic AVMs show evidence of past bleeding. But massive hemorrhages can occur if the physical stresses caused by extremely high blood pressure , rapid blood flow rates, and vessel wall weakness are great enough. If a large enough volume of blood escapes from a ruptured AVM into the surrounding brain, the result can be a catastrophic stroke . AVMs account for approximately 2 percent of all hemorrhagic strokes that occur each year.