is by no means uncommon, and usually responds well to prescription orthoses, so consider having a podiatrist carry out a full biomechanical assessment.—David Holland, consulting podiatrist

problems you should see a podiatrist, preferably one with experience of treating runners. In a minority of cases of this type, prescription foot orthoses which support and control the feet are needed to resolve the problem.—David Holland, consulting

Q I’m an overweight beginner who can now run three to four miles every other day at a steady 10 minute/mile pace. But a few years ago I suffered fallen arches, which caused quite considerable pain. My GP recommended arch supports, which I stopped

Q I’ve bought some new shoes which give me blisters on the inside of the arches on both feet. My previous shoes were fine, and the new pair are designed to offer excellent foot support. So have I just chosen the wrong ones? I’m 12.5st and I run

that you have tried supports. But if these were off-the-shelf orthotics, they may not have offered the same benefits as prescription devices.—David Holland, consulting podiatrist