A commonly asked question is ‘what is a hairline fracture?’ People usually ask this question when they experience bone pain for a long time after exercises or accidents, or when some areas of their bodies are subjected to excessive force. A hairline fracture, sometimes called a stress fracture, refers to a small break in the bone which is often not readily visible and causes painful sensations, swelling, and limited mobility. A hairline fracture, unlike other fractures, occur