This prospective observational study aims to evaluate bone pain and related symptoms in patients with solid tumors receiving granulocyte colony-stimulating factor (G-CSF) during chemotherapy. A total of 128 patients will be enrolled at Ankara Etlik City Hospital. Pain severity will be assessed using the Visual Analog Scale (VAS), and supportive care strategies such as analgesics and non-pharmacological approaches will be documented. Patient-reported outcomes, including quality of life, fatigue, anxiety, depression, and sleep quality, will also be evaluated before and one week after G-CSF administration. The findings are expected to provide practical insights into the management of G-CSF-induced bone pain and improve supportive care practices.