The back is uncomfortable, but not painful, may be related to the following reasons: 1, there may be mild muscle spasm, this situation is often seen in patients with poor sitting posture, or prolonged sitting and standing low, after the back of some muscles will lead to increased muscle tone, the patient will feel the back tight, there are restrictions on movement. This is the first time that the back is tight and restricted, but the pain can be very mild or even absent. 3, this condition may also be caused by osteoporosis. This disease is common in the elderly, often due to insufficient food, malnutrition, resulting in a lack of calcium in the body, which then leads to osteoporosis, will be manifested as the back without any triggering factors of weakness, or other uncomfortable symptoms.