A bacterial infection of the vagina can feel a lot like a yeast infection if the vulval area is itchy or painful. Unlike a yeast infection, the discharge can be dark yellow, green, or brown and it won't smell like bread, it can smell like fish or something rotting.
GERD can and does cause upper back burning sensations that can migrate down one side or both sides of the body to the legs. Sometimes pain or symptoms may occur in the chest or sternum area but not always. GERD can also cause a recurring cough and fatigue.
Spinal stenosis is another rare condition that can cause upper back pain. This pain is the result of your spine narrowing, which puts pressure on the spinal cord. Symptoms for spinal stenosis are numbness and pain in the upper back, neck and shoulders, and weakness in the arms and legs.