Which foot condition is characterized by the arch collapsing?

The foot condition characterized by the arch collapsing is flatfoot, also known as pes planus. This condition occurs when the arch of the foot does not develop properly or collapses, leading to the entire sole of the foot making contact with the ground.

Individuals with flatfoot may experience discomfort or pain, especially after prolonged standing or physical activity, due to the altered mechanics of the foot. The collapse of the arch can also affect the alignment of the ankles, knees, and hips, potentially leading to secondary issues in these areas.

In the context of other options, plantar fasciitis involves inflammation of the plantar fascia, a tissue that supports the arch but does not inherently indicate arch collapse. Pes cavus, the opposite of flatfoot, is characterized by an excessively high arch, leading to its own set of problems. Hallux valgus refers to a deformity of the big toe that may result in bunions, but does not pertain to the structure or height of the foot arch.