<s>[INST] Hi I have constant dull ache in my lower back. I can`t stand for long and find sitting on a hard seat for long very uncomfortable. Even walking is hard as I feel very stiff. I was in a car accident last year and did major damage to my lower leg. This meant I had to sit for months with my leg up as it was non weight bearing. I am wondering if this is a muscular  problem or perhaps arthritis [/INST] Hello, Welcome at Chat Doctor. I have read complete details of your question. It looks from your details that you had previous injury to your leg. Most probable reason for your present back pain is taking rest for long time. This had lead to decreased power in your back muscles. At present, you should do following to have relief in this--At least have an x-ray of your back, so that you may know if there are early changes of arthritis at spine. This may be there due to increased load over your spine.-Take a good analgesic like Advil or sleeve, These are OTC medicines.-Do warm fomentation over your back.-Take help of a good physiotherapist. He may apply some modalities like ultrasonic therapy,infra-red therapy,galvanic therapy for relief.-Learn some exercises to strengthen your back, like-http://orthoperson.blogspot.in/Hope this all will help you. With best wishes. </s>