If the patient’s feet feel weak, this may be due to two diseases: First, it may be due to hypokalemia, which may cause weakness in the muscles of the feet, and it is recommended that the patient should go to the hospital for a relevant examination, such as a blood test for electrolytes, to clarify the K ion level. The normal level of K ion is 3.5-5.5 mmol/L. If the level is lower than 3.5 mmol/L, hypokalemia is indicated and the patient is advised to replenish the potassium level in a timely manner. When the blood potassium concentration reaches above 3.5mmol/L and below 5.5mmol/L, the symptoms of muscle weakness can be effectively avoided in this case. Secondly, this condition may be caused by lumbar disc herniation, commonly known as lumbar five-sacral one disc herniation, because the main symptom of lumbar five-sacral one disc herniation is the weakness of the muscles of the feet, the decrease of the dorsiflexion or flexion muscle strength of the lesser toes, and the decrease of the dorsiflexion or flexion muscle strength of the ankle, so this may lead to the weakness of the feet. This is also the time to go to the hospital for relevant tests, such as an MRI of the lumbar spine, or a CT of the lumbar disc, which can clarify this diagnosis. After the diagnosis is made, it is recommended that the need for surgery be determined on a case-by-case basis. If surgery is needed, it is recommended that it be performed in a timely manner to avoid prolonged nerve compression, which may lead to slow recovery.