Does anyone else ever get pins and needles in their feet while running? I only recently started running again regularly and it's surprised me.
I've moved to a brand new pair of running trainers, tried different socks, loosening the laces, and running faster and slower. It starts in my left foot after about 3 miles and persists unless i stop and rest for a minute. After about the 5th mile my left foot and ankle is completely numb! Anyone know what I could do to prevent it?
For numbness/ pins and needles there has to be some compression on the nerve or blood supply to the nerve somewhere. Most likely, if its the whole foot is tarsal tunnel syndrome (like carpal tunnel syndrome in the wrist/hand) presenting as a result of one type of 'shin splints' (posterior/exertional compartment syndrome).
The space where the nerve to your foot runs can narrow when there is repetetive friction (with some swelling) from the nerves, tendons, blood vessels on the inside edge of the ankle/shin. It could be because you are overpronating a bit more than normal on the left (+/- tibialis posterior weakness) or that there is some tightness in the muscles there (flexor hallucis longus, flexor digitorum longus) or simply because your return to running has been too rapid and the fascia is restricting you.
The first thing i would try, if it was me, would be some calf stretches which incorporated the FHL and FDL IF they ARE tight (if not then there is no need):
Compare length of FDL by sitting on your heels like this:
You should feel an equal stretch in both sides, if the left feels tighter then stretch it or if the toe(s) physically does not bend as much then stretch it.
Normal FHL
Restricted FHL
Sitting in that position will stretch it or so will something like this:
After that/If there is no tightnes move on to some myofascial release to try to stretch/release the fascia in the restricted area by rolling a ball, foam roller, rolling pin etc. up and down the lower third of your inside calf:
Try doing those a few times in the days leading up to your next run and prior to setting off and see if anything has changed, if it has then continue with them until it goes completely.
If that fails I would then look at trying a new pair of trainers (if you weren't assessed for them) or some tibialis posterior strengthening exercises, failing that its GP/Physio time.
There are a few other causes of a numb foot when running but this would be the most likely from the symptom pattern you describe. Hope it helps.