Causes - Bedsores (pressure sores)

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If you've been immobilized, bedsores can be caused by:

Sustained pressure. When your skin and the underlying tissues are trapped between bone and a surface such as a wheelchair or bed, blood flow is restricted. This deprives tissue of oxygen and other nutrients, and irreversible damage and tissue death can occur. This tends to happen in areas that aren't well padded with muscle or fat and that lie just over a bone, such as your spine, tailbone (coccyx), shoulder blades, hips, heels and elbows.

In some cases, the pressure that cuts off circulation comes from unlikely sources: the rivets and thick seams in jeans, crumbs in your bed, wrinkled clothing or sheets, a chair whose tilt is slightly off — even perspiration, which can soften skin, making it more vulnerable to injury.

Friction. Frequent shifts in position are the key to preventing pressure sores. Yet the friction that occurs when you simply turn from side to side can damage your skin, making it more susceptible to pressure sores.
Shear. This occurs when your skin moves in one direction, and the underlying bone moves in another. Sliding down in a bed or chair or raising the head of your bed more than 30 degrees is especially likely to cause shearing, which stretches and tears cell walls and tiny blood vessels. Especially affected are areas such as your tailbone where skin is already thin and fragile.