Cancer is among the major health problems all over the world. Every year, 400 000 children are diagnosed with cancer all over the world and 3500 children are diagnosed with cancer every year in our country. It is estimated that the number of children diagnosed with cancer will increase exponentially every year. In addition to this increase in the incidence of childhood cancers, developments in medicine and technology in recent years have enabled the life expectancy of children diagnosed with cancer to extend. However, cancer and its treatment cause physiological and psychosocial problems that can negatively affect the lives of children diagnosed with cancer. Symptoms such as pain, fatigue, sleep problems, nausea/vomiting, loss of appetite, physical activity intolerance, stress/anxiety are common in children with cancer, depending on the disease and its treatment, and they negatively affect the quality of life of children In order to reduce the negative effects of symptoms caused by cancer and its treatment, it is important to separately evaluate and address the quality of life of children diagnosed with cancer and factors such as sleep, fatigue, stress and physical activity, which constitute the quality of life components. It is recommended to use complementary treatment methods, including mind-body practices, to improve the quality of life of children diagnosed with cancer and to reduce the symptoms and effects that may occur. Complementary treatment methods include massage, acupuncture, breathing exercises, relaxation techniques, laughter therapies and yoga. Children's yoga, which has been used in children with cancer in recent years, is defined as physical activity that provides strength, balance and movement in children, as well as activities that increase awareness through breathing work. It has been determined that yoga activity has positive effects on the physiological and psychological measurements and quality of life of children with cancer.

The fact that yoga activity can be done in any area without the need for any materials provides an advantage for children diagnosed with cancer. The play and activity needs of children with cancer who are isolated due to cancer and its treatment must be met under safe conditions. Children's yoga, performed with simple and fun movements in the hospital room, can increase the activity of the child with cancer and meet the need for play and activity. It may also help the child diagnosed with cancer to shift the focus away from the disease and the negative effects that the disease may have caused. Improving the quality of life of children diagnosed with cancer, reducing/controlling the symptoms caused by cancer or its treatment, and planning and implementing new coping methods are among the main goals of pediatric oncology nurses. Although there are studies on the effects of yoga practice on children with cancer in the literature review, there are limited studies on this subject in our country. In line with all these, this research was planned as a randomized controlled experimental study to determine the effect of yoga practice on the symptoms, fatigue and quality of life experienced by children diagnosed with cancer.