Hidden pain in the lower part of the right back is related to muscle strain, fasciitis and local muscle spasm. 1. muscle strain: such as doing pull-ups and basketball and other upper limbs or trunk after a wide range of activities, a muscle group of the back strained, such as latissimus dorsi muscle strained below the outside of the right lower back pain, do adduction or chest expansion exercise after the pain intensified. 2. Fasciitis: If there is fasciitis in the back, there can also be pain in the lower right back, which is mainly caused by prolonged exertion and catching cold. It can lead to aseptic inflammation in the deep tissues. 3. Local muscle spasms: Keeping the same bad posture for a long time, such as making the muscle groups for a long time tension can lead to spasms and strain of the muscle groups and then pain. Hidden pain in the right lower back may also be caused by other reasons, it is recommended to go to the hospital for a detailed and comprehensive examination. We recommend that you go to the hospital for a detailed and comprehensive examination to determine the cause of the pain and then give the corresponding treatment.