Fluid retention occurs when excess fluids build up inside your body. Fluid retention is also known as water retention or edema. This commonly occurs in the circulatory system or within tissues and cavities and can cause swelling in the hands, feet, ankles and legs.
A body complication can be dangerous when it affects everyday nerve, motor and autonomic functions, including the immune system and blood flow.
Foot drop is a general term for difficulty lifting the front part of the foot, which might even drag on the ground while walking.