Simple Definition:

Claudication is a medical condition characterized by pain or cramping in the legs during physical activity, caused by insufficient blood flow to the muscles.

For example, a person with claudication may experience pain in their calves while walking or climbing stairs due to poor circulation in their legs.

Very Simple Definition:

Claudication is a condition that causes leg pain during movement.

For example, someone with claudication may feel pain in their legs when they walk or climb stairs.