<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have had a mass on my spleen for a long time. It measures 10.7 and 9.3. for about 3 or 4 weeks I have been having pain on my left side and it hurts terribly. also starting yesterday, I started getting spasms in my back above my lower back. today I have been in severe pain all down my back. I don t know where it is coming from but it really hurts and my dr is booked up and cant see me. can u please help me figure this out.  <response>: HI, Thanks for asking. I understand your concern. You have left sided back pain severe enough to disturb you. After going through your information I feel the cause of such a pain in your case seems to be- - A simple sprain of back muscles. Which will resolve with home care suggested in the end. - Pressure symptoms of the splenic mass you have. IT is pressing on the nerve supplying middle lower back causing the pain. - Another logical possibility the considerably big mass stretching the line of gravity in front. While the back muscles pull it back to maintain equilibrium. The muscles are thus over strained get painful. - Nerve root compression at spinal level due to inflammation degeneration of vertebrae inter vertebral disc can lead to such pain. You need consultation of a gastroenterologist orthopedic surgeon. MRI of the part would pinpoint the cause . This will follow specific treatment. Till then, you can try. Taking rest applying muscle relaxants locallyno massage please pain medicines over the counter avoiding bending or weight lifting while you can get appointment of a doctor If the pain is unbearable go to ER for preliminary management. Thanks. 