<human>: I am experiencing lower back pain for the past week. It hurts to move, soreness and stiffness. Some pain in one side of my buttocks now and again. I am about 30lbs overweight, need to change my mattress that I sleep on and recently had a very demanding day, prior to feeling this way, where I had to rush around a lot, walking and running which I am not use to. I have also been ill with a gastric bug recently for a couple of days. I have had sciatica in the past also, when pregnant.  I have a bit of bruising where the pain is located from but this could be from applying pressure to the spot which when done alliviates the pain.
<bot>: HI, thanks for using Chat Doctor It is quite likely that the pain may be related to the increased demands that you had to place on your body recently. It is possible that this would have resulted in mild trauma or strain on the muscles in the back. The increased weight would also increase the pressure on the back. Signs and symptoms of more serious back injury are : numbness or altered sensation in the genitalia or anal region, numbness or altered sensation in the legs, weakness, urinary incontinence or retaining urine, fecal (stool) incontinence. You may want to consider the use of an anti-inflammatory pain killer to help reduce the pain. This would include medication such as ibuprofen, aspirin, diclofenac, naproxen, Celebrex. These medications should be used on a full stomach the pain continues despite the use of medication then you may want to be evaluated by your doctor hope this helps