Hello, I am a 30 year old male, 6' tall, and 155 lbs. I am in very good physical condition and to my knowledge have no relevant medical history to report.

My question is about back pain. Three or four days ago, I developed fairly severe localized pain in the middle of my back, to the left of my spine. The pain is not constant, but is made worse primarily by twisting my torso and manipulations that require me to arch my back. Some postures relieve it, such as lying flat on a firm surface (e.g. the floor) with no twisting. I would describe the pain as a dull ache that sometimes radiates to other parts of the back. The pain has lessened slightly over the past couple of days but is still present. It tends to be worse immediately after waking up, possibly because of my sleeping position(s).

My question is as follows: are there any additional symptoms that I should watch for, and how can I know whether or not this condition requires immediate medical attention?