Our expert says:
This sounds like maybe it's tightness of the calf, or the fascia that surrounds the calf muscle, and as soon as you run, the increased impact (we take about 3 times our body weight on each leg as we land, much higher than for walking) is causing the problem, probably because that tight muscle is not strong enough to "absorb" the impact. I don't think the shoe is to blame, though if the shoe is quite stiff, it might exacerbate the problem.
I think that you need to continue walking until you do improve the strength of the ankles and calves - the swelling is another sign of the strain they're under. So keep walking, walk faster as you get fitter and see if you can gradually phase the jogging in. The body will adapt to the training and should allow this, but it may be that you need to give it time, weeks worth, in order for it to happen properly.
Also, strengthen your calves by doing heel raises - stand on a step with the ball of your foot, and heel off teh back and then raise slowly up and slowly down. The key is to go slowly, and not to bounce up and down. 3 sets of 10, three times a day, to help strengthen the calves.
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