The feeling of throbbing in the lower back may be caused by overwork, lumbar muscle strain, smooth muscle spasm and autonomic dysfunction. 1. Overexertion: strenuous activity of the muscles of the posterior lumbar region and overwork can lead to overloading of the muscles of the lumbar back, causing spasms of the muscles of the lumbar back and the manifestation of muscle throbbing. 2. Lumbar muscle strain: long-term engagement in heavy physical labor, lumbar posture, lumbar overload, etc., can lead to strain on the muscles of the lower back, local aseptic inflammation, edema, pain and other manifestations, resulting in muscle throbbing symptoms of the lower back. 3. Smooth muscle spasm: renal inflammation, stones, tumors and other lesions can stimulate the smooth muscle spasm in the lumbar back, causing pain in the lower back, and muscle throbbing and other symptoms. 4. Autonomic dysfunction: excessive mental stress or long-term mental tension can cause abnormal neural regulation and emotional changes, and can also cause muscle spasm and throbbing in the lower back. When you feel throbbing in the lower back, you should consult a doctor in time, and under the guidance of a specialist, you can actively take appropriate treatment to help alleviate the uncomfortable symptoms as soon as possible.