You may have some reasons for the problem, but I think there is one reason. This means that there is a slight increase in bone growth from the bone at the end of your waist, that is, at the end of your spine . These pains are very painful. Go to a neuromedicine specialist without delay. If necessary , xray will be required. However, if it does not work in medicine, small operations can be done. In that case, I think it is most important to go to the doctor immediately. You should sit on a high place, sit on a stool or a chair , stop doing heavy work completely. Do not pull weight, that is, do not carry heavy things on your shoulders, walk every morning , do not sit in one place or one place for a long time. Eat foods rich in nutritious vitamins . Thanks.