A Stress fracture of the neck of the femur happens when there is an imbalance between the bone formation and bone resorption. When the neck is loaded with stress like weight-bearing exercises, the neck of the femur responds by a bone turnover. The turnover does the removal of the weakened and damaged areas of the bone laying down and replaced with a new bone. When the new formation cannot keep up with the resorption then the stress fracture of the neck of the femur is inevitable. This fracture feels like a dull ache and generally develops over a period of weeks. Frequent exercise worsens the injury, the pain can be felt when walking or resting. It needs an intensive care and you need to take it seriously.