This document discusses pes planus (flat foot), including its causes, classification, presentation, diagnosis, and management. Pes planus is characterized by loss of the medial longitudinal arch of the foot. It can be flexible or rigid. Diagnosis involves examination of footprints, x-rays, and mobility tests. Management for flexible pes planus focuses on orthotics, footwear, stretching, and strengthening exercises. Rigid pes planus may require surgery. Physiotherapy aims to reduce pain, increase flexibility, and strengthen weak muscles.