What Causes Sharp Chest Pain In Lower Back After A Shower?

Symptoms: Sharp chest pain in lower back after getting out of the shower, lying down or sitting up straight for long periods of time. Age:17 yrs 9 months Height 5 4 Weight:10st9 Medical History: Pneumonia leading to pleural effusion, 2 pockets on 1 lung (5 years ago), significant scarring to the right lung. Liver damage, recent chest infections