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Dr. Mark
Dr. Mark, Doctor (MD)
Category: Health
Satisfied Customers: 11946
Experience:  U.S. Physician/Surgeon in Neurosurgery
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Half of my left foot is numb. From the middle to the outer

Resolved Question:

Half of my left foot is numb. From the middle to the outer side. Just noticed it last night. Initally thought foot had just fallen asleep but has remained numb. It's been almost 18 hours now. Is this something I should go get checked out
Submitted: 8 years ago.
Category: Health
Expert:  Dr. Mark replied 8 years ago.
Do you have numbness on the top of the foot, or the bottom of the foot?

Anything in the shin, or the calf? Or further up the leg?

Do you have weakness in the foot (e.g. trouble with walking)?

Customer: replied 8 years ago.

Numbness is on the bottom of the foot.

Nothing on shin or the calf or the leg

Only weekness in the foot when walking, feels sort of like I'm stepping on something soft. Essentially not really weak just a dull sensation

Expert:  Dr. Mark replied 8 years ago.

Can you stand on your tip-toes and walk around without a problem?

And is there any swelling / injury to the bottom of your foot / ankle recently?
Customer: replied 8 years ago.

No problem walking around room on tip-toes. No strength in left foot on tip toes, found myself having to lean towards the big toe on the left foot. If lean toward the outer edge on left foot lose balanc.


No swelling/injury to bottom foot/ankle. Actually, noticed problem last night around 11pm after falling asleep on the couch. That's why thought foot had just fallen asleep.

Expert:  Dr. Mark replied 8 years ago.

The numbness in this specific area (more bottom of the foot and the pinky toe side) really suggests a nerve irritation as the possible cause.

The final branches of the S1 (first sacral nerve) and sciatic nerve go to this area, and a possible cause of numbness is compression in specific areas in the leg. Because this only seems to affect your foot, one such area is the tarsal tunnel:

(though this may tend to affect more the inside bottom of the foot, rather than the outside).

While it is hard to say why this would have suddenly occurred, it probably would be best to keep a close eye on it and get it checked out soon if it doesn't improve (or worsens), as a detailed neurologic exam and further testing if necessary would be helpful in the diagnosis of this focal "peripheral neuropathy".
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