If the patient has a vague pain on the right side of the lower back, it may be due to the presence of excessive fatigue here, muscle spasm, kidney disease and other causes. The specific causes are as follows: 1. Excessive fatigue: this is the most common. These patients tend to sit and stand for a long time and have poor posture. This may cause the muscles on the right side of the waist, such as the psoas major muscle, to become overworked, which in turn causes the above symptoms. If these patients are not able to remove the cause of the disease, the lesion may continue to progress, leading to lumbar muscle strain. 2. Muscle spasms: These patients may suffer from cold in the lower back, use one side of the lower back to exert excessive force, or have a muscle strain in one side of the lower back, causing muscle spasms in the right side of the lower back. If the lesion is mild, it may only cause mild soreness. If the lesion is more severe, it may cause obvious tingling, weakness and other symptoms. In addition, these patients may also have the symptom of muscle strips visible to the naked eye at the lesion. 3. Kidney lesions: Some patients with right-sided kidney lesions, such as kidney tuberculosis, kidney stones or glomerulonephritis, may cause vague pain on the right side of the kidney area, that is, at the intersection of the 12th rib and the erector spinae muscle. In addition to this, such patients may also be accompanied by a series of symptoms such as elevated blood pressure, hematuria, decreased urine output, weakness, and so on. It is recommended that patients should pay attention to the warmth of the waist and rest after the occurrence of the above symptoms, and then go to the orthopedic department as soon as possible.