Today I have experienced chest pain right over where my left lung is, it isnt a throbbing pain, I am thinking it is a recurrence of my pneumonia I had when I had my back surgery. I am 20 years old, not overweight, and I Have scoliosis and possible elhers danlos. My knees sublux and every joint in my body pops, way more than any normal person my age, I also have pain in my knees after long standing sessions.