Symptoms: 1. Numbness or loss of sensation in the toes, sole, and heel; 2. Frequent downward flexion of the toes; 3. Symptoms worsen during the day or with activity, forcing standing at night to relieve discomfort. Etiology: On the medial side of the foot, there is a tibial nerve that travels to the sole of the foot and divides into multiple nerves, which may cause nerve entrapment and injury symptoms due to plantar fascia entrapment. Especially when the foot is active, the nerve is compressed, causing a decrease in blood flow to the nerve, resulting in numbness symptoms and loss of sensation in severe cases. Trauma and diabetes can cause it. Conservative treatment: Exclude multiple neuropathy and toenail causes. Change the daily activity habits, etc. Surgical treatment: 1. Numbness in the toes or soles most of the time every day; 2. Numbness in the soles or toes that severely interferes with rest; 3. Loss of sensation in the soles or toes that interferes with walking or other activities; 4. Balance impairment due to sensory impairment in the soles of the feet; 5. EMG abnormalities. Surgery: Tibial nerve and its branches are released and decompressed. It can be done endoscopically or under a microscope. Surgical efficacy: Diabetes mellitus combined with ankle tube syndrome, the postoperative numbness relief rate is 90%, pain relief is more than 80%, and sensation is restored.