Numbness of the middle finger of the left foot may be caused by toe neuritis, lumbar disc herniation, diabetes and other reasons, the specific cause of the disease need to go to the hospital in time for examination and confirmation. 1. phalangeal neuritis: when the foot is overworked for a long time, causing local injuries and nerve irritation, the nerve at the end of the foot becomes inflamed, which can lead to numbness in the middle finger of the left foot. 2. lumbar disc herniation: if you suffer from lumbar disc herniation, it will cause numbness in the lower limbs due to compression of nerve tissue, which can lead to numbness in the middle finger of the left foot, and sometimes accompanied by different degrees of pain. 3. diabetes: when suffering from diabetes, if the condition is in the early stage, the body’s blood sugar increase caused peripheral nerve damage, long-term so will lead to the symptoms of numbness of the left foot middle finger. Numbness in the middle finger of the left foot can be caused by a number of reasons, and when symptoms occur, it is recommended to go to the hospital in time for early treatment.