Fracture healing is a complex biological process in which the body repairs damaged bone tissue and restores its normal strength and function. This process depends on adequate blood supply, stability at the fracture site, and the patient's overall health. However, disturbances in this process may lead to delayed fracture healing or nonunion, affecting the patient's ability to move and perform daily activities. Bone healing occurs through several stages, beginning with the formation of a hematoma at the fracture site, followed by the development of temporary cartilage tissue known as a callus. This tissue gradually transforms into new bone, followed by the remodeling phase (Bone Remodeling), during which the bone regains its normal structure and strength. The main causes of delayed fracture healing include open fractures, poor blood circulation, infection, and inadequate fracture fixation. Other contributing factors include smoking, diabetes mellitus, malnutrition, vitamin D and calcium deficiency, and advanced age. Common symptoms include persistent pain and swelling at the fracture site, difficulty moving, and inability to bear weight on the affected limb. Diagnosis depends on clinical examination and radiographic imaging. Computed tomography (CT) scans and laboratory investigations may also be used to identify associated causes. Treatment depends on the nature and severity of the condition and may include surgical fracture fixation, bone grafting to stimulate new bone formation, and the treatment of infections and nutritional deficiencies. Physical therapy also plays an important role in maintaining joint flexibility, strengthening muscles, improving balance, and restoring mobility. Patients must also follow medical instructions regarding weight-bearing activities. Prevention requires proper fracture stabilization, maintaining a balanced diet, avoiding smoking, controlling chronic diseases, and attending regular medical follow-ups. In conclusion, delayed fracture healing does not affect the bone alone but may also have a significant impact on the patient's quality of life and independence. Therefore, early diagnosis, appropriate treatment, and comprehensive physical rehabilitation are essential factors in restoring normal movement and functional ability. Al-Mustaqbal University – The No. 1 University in Iraq