<s>[INST] Hi Dr. I had noticed a sudden numbness at top left side of foot all the way to the ankle, not the whole left foot is numb just a small area up to the ankle .Its been about 12 hours and has not gone away but has not spread either.Do you have any idea? Thanks for your input and or any suggestions. [/INST] Hi, As there is numbness over the foot I think there will be a nerve entrapment at the L5-S1 level in the lumbar spine and needs an MRI. Since the individual nerve has its own dermatomes and motors to supply and work, this pathology might be leading to symptoms. Doing core stability exercise, spinal muscle Strengthening exercises, hip muscle strengthening exercises, static qua Chat Doctor.  Hope I have answered your query. Let me know if I can assist you further. Jay In </s>