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Hi and thanks for the query.
At your age, pain in the arch of the foot is usually due to plantar fasciitis. It is a fascia that covers the plantar /heel to sole aspect of the foot over the muscle. It becomes tight and bruised due to prolonged walks, bad footwear and prolonged standing.
The diagnosis can be confirmed on an examination and once that is done, treatment is usually with avoidance of vigorous physical activity, gel pads and insole pads, softer footwear and plantar exercises.
If it remains unhealed then injection of cortisone can be given and the last resort is per cutaneous plantar fasciiotomy.
Let me know if you have further questions.
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Wish you good health.