Diagnosis required from our forum experts please!
Out running this morning as is my want of a Thursday. Around the 6-7k mark my left foot started to go numb. Around the 8 mark, it has spread to my ankle and achilles. This has never happened before. The run was pretty standard fare on a route I have done many times. The pace was pretty much average for me.
Any ideas what may have caused this? It passed fairly quickly during my warm down walk
No expert but it could well be your laces were too tight... sounds daft I know but your feet swell up quite a bit on the run...
I'm sure some people who've experienced this will be along shortly... please take a seat... 
Now that I think on it Aussie, I did tie the left foot slightly tighter than normal. Could it be so simple?
I sahll look out for that on Saturday
I was going to say that too. Aussie mentioned this on a post before, and I was getting numb toes. So I took his advice, and all better now.
Entirely possible... it's also possible your shoes are too tight full stop but that would mean it would have happened before... Quite a few ways to tie laces it seems... perhaps parallel lacing is for you? And slightly looser..
Yep, I was going to suggest the same as Aussie. Easily done and hopefully the cause. Next run make sure you don't tie it so tight and see how you get on.
I was going to suggest a shoe issue too. I've had this twice now, both with each pair of new shoes I've had, where I'm getting used to the laces and over-tied them. Amazing how something so simple can have such an effect!
Much obliged folks. I shall report back tomorrow.
...and I feel AWESOME tonight!
New leg outing.
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