Hidden pain in the left lumbar eye may be caused by trauma, nephritis and lumbar muscle strain. 1. Trauma: When patients fall down accidentally during exercise, it will directly lead to lumbar injury, which can cause vague pain in the left lumbar eye. 2. Nephritis: Nephritis is a kidney disease of different degrees caused by many factors. As a result of long-term inflammation, it may lead to vague pain in the left lumbar eye, or the symptoms of pain in both lumbar eyes may occur. 3. Lumbar muscle strain: lumbar muscle strain is a chronic sterile inflammation that occurs in the lumbar region, and patients may experience vague pain in the left lumbar eye, and some patients may also experience pain in the lower limbs and buttocks. When the patient appeared left lumbar eye hidden pain, should go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, follow the doctor’s instructions for treatment.