Low back pain and swollen feet may be caused by excessive fatigue, but it can not be ruled out that it is caused by gout, lumbar disc herniation, etc., and you should consult a doctor in time to find out the cause of the disease. 1. Excessive fatigue: If patients stand for a long time or walk with weight for a long time, it may lead to lumbar muscle pain due to excessive fatigue. At this time, certain soft tissue interstitial spaces in the lower limbs, due to posture, may have fluid accumulation, resulting in swollen feet. 2. Gout: Gout is mainly an abnormality of purine metabolism, resulting in elevated blood uric acid. When blood uric acid rises above a certain concentration to form urate crystals, it can cause swelling and pain in the joints. Painful episodes often occur in the joints of the lower limbs, which can cause swelling of the feet, and usually gout is in the acute stage. When urate crystals are deposited in the kidneys, leading to the formation of kidney stones, may cause symptoms of low back pain. 3. Lumbar intervertebral disc herniation: the herniated disc or nucleus pulposus compresses or stimulates the nerve root, leading to radiating pain in the muscles of the innervated area, which will cause low back pain symptoms; the nerve to the vascular innervation is weakened, causing edema reflux obstruction, which will cause swelling of the feet. There may be other causes of back pain and swelling of the feet, if you exclude physiological causes, you should consult a doctor in time, ask the doctor to clarify the specific causes, and if necessary, carry out the appropriate treatment.