Fit & comfort
Should You Size Up Shoes for Plantar Fasciitis?
Sizing up is not a reliable support strategy and may create heel movement.
Use this focused answer with our central shoes for plantar fasciitis guide and finder.
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Work out what feels too small
Sizing up is not a reliable support strategy and may create heel movement. Before ordering the next size, identify whether the toes reach the end, the forefoot is compressed from the sides, or the top of the foot presses against the upper. Each problem points to a different possible adjustment.
If the length is already adequate, a wider option or a differently shaped toe box may answer the complaint more directly. If pressure is mainly above the foot, investigate depth and the fastening arrangement. Extra length can leave the original pressure point unchanged.
When a larger size can be reasonable
A size increase can be appropriate when the current shoe really is too short or when a clinician-supplied insert changes the fit. Oxford University Hospitals notes that some orthotic users may need a larger size. That is a fitting decision, not a universal rule for plantar fasciitis.
Compare the larger pair with the original while wearing the same socks and device. Make sure improved front space has not come at the expense of heel security. If the shoe must be laced excessively tightly to stay on, another model may provide a better balance.
Avoid using size to compensate for the wrong shape
The number on a box cannot describe the full interior. Two models in the same labelled size can differ at the arch, heel, toe taper, and instep. If several sizes all feel wrong in different ways, stop treating that model as the only option.
Consider both feet when deciding. One foot may need more space, but the other still needs comfortable retention. A retailer with several widths or an experienced fitter can help compare those tradeoffs. Do not buy a loose shoe simply because swelling or an insert might require more room at some unspecified future time.
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General education only. Persistent or severe foot symptoms should be assessed by a qualified professional.