There are many reasons why you can’t bend down and walk with lumbar pain, mainly related to the dysfunction of small joints of lumbar vertebrae, lumbar myofasciitis, acute lumbar sprain and so on. 1. Disorders of the small joints of the lumbar vertebrae: when the small joints of the lumbar vertebrae compress the surrounding synovium and stimulate the peripheral nerves, it will lead to pain in the lumbar region, and in severe cases, it is impossible to bend down and walk. 2. Myofasciitis of the lumbar region: when inflammation occurs in the lumbar muscles, lumbar pain will also occur. 3. Acute lumbar sprain: such conditions can lead to soreness and tension in the muscles around the lower back and an inability to bend over. There may be other causes of lumbar pain, such as ankylosing spondylitis, lumbar disc herniation, lumbar muscle strain, etc. It is recommended to consult a doctor in time, complete the relevant examinations, and carry out targeted treatment after clarifying the cause of the disease.