Downstairs leg shaking may be related to overwork, mental tension and other physiological factors, but also may be due to chronic strain injury, knee joint lesions, lumbar spine lesions, Parkinson’s disease and other pathological factors, the need for timely consultation, to identify the cause of the disease. 1. Physiological factors: after excessive mental tension, excitement or overwork, muscle tremors may occur when walking down stairs, which can usually be relieved through rest and other self-regulation. 2. Chronic strain: Long-term heavy physical labor, carrying heavy loads, etc., may lead to strain on the leg muscles and a decrease in muscle strength, thus causing the legs to shake when walking down the stairs. 3. Knee joint lesions: when suffering from knee degeneration, ligament damage, etc., the stability of the joints decreases, when going down the stairs, the balance and strength of the legs can not be better controlled, so there is a shaking. 4. Lumbar spine lesions: lumbar disc herniation, lumbar spine slippage, due to the nerve root or the spinal canal is compressed, affecting the strength of the lower limbs, thus causing shaking. 5. Parkinson’s disease: due to the degeneration of dopamine neurons in the brain, it will cause the neuromuscular excitability to rise, and leg shaking will also occur when going down the stairs. If you can’t improve your leg shaking by self-regulation, you should consult a doctor in time to clarify the cause of the disease and follow the doctor’s instructions for standardized treatment.