My daughter (age 25) was recently admitted to hospital due to extreme upper back/left side pain. It had started in the morning after getting out of bed and got suddenly worse PM. She received Oramorph (liquid morphine), a Paracetamol drip and Entinox. These did little to reduce the pain. Later she was given Tramadol. This helped slightly. Blood tests were normal, apart from the D Dimer test which was raised (level 21). Initially though to be a blood clot on her lung, the Consultant said that that was unlikely as an X Ray of her chest was clear and heart trace normal. She was then given Diazepam (to relax her muscles). This seemed to help and later that day she was discharged. She is still in a lot of pain. The medication does help when it kicks in. She had a check-up today. The Doctor said he could detect muscle strain as he side and back muscles were in spasm. Any idea what caused this, what it is, is it likely to return and what about the D Dimer level?