What causes an ankle to sprain?

Many things: A sprain occurs when your ankle is forced to move out of its normal position, which can cause one or more of the ankle's ligaments to stretch or tear. Examples of situations that can result in an ankle sprain include: a fall that causes your ankle to twist landing awkwardly on your foot after jumping or pivoting walking or exercising on an uneven surface.

Several causes: Generally ankle sprains occur as the result of uneven surfaces, failure to properly transition from surfaces of different levels, falls from heights, instability.

Excessive twisting : An ankle sprain is usually caused by a sudden twisting or a direct injury of the joint. This may happen while playing sports, or may be due to a fall.