<s>[INST] churchill i have a striking pain at the lower part of the back. it is not consistent. some times it will not allow me to even pick something from the grown. it is very aching. sometimes i don t feel that pain at all. what could it be. could it be a symptom of an std. [/INST] Hi, If you are elderly then it seems due to some pinched nerve pressure due to degenerative changes in your lower spines. This might be due to stiffness in back muscles as well. When nerves get pressure or irritation you may get pain and when it is released then you might not feel pain. Go for x-ray lower spines. Go for back extension exercises daily. Take calcium, vitamin A and D supplements. Ok and take care. </s>