Causes of Bedsores
The main cause of a pressure sore is impaired mobility of the patient. If the patient is not moving, areas of skin that cover bony prominences such as the hips, buttocks, back, and extremities may be subjected to constant pressure that causes skin breakdown because of the pressure-induced ischemia (low blood flow to the pressure damaged tissues). However, there are other causes that affect the patient that contribute to the formation of pressure sores. Some of the major contributors toward the development of pressure sores are as follows:

Impaired mobility due to sedation, anesthesia, neurologic problems or trauma

Friction and shear forces: pulling sheets or covers against damaged skin, skin rubbing against itself

Inability to feel pain: anesthesia, neurologic damage

Incontinence of urine or feces: Moisture causes maceration of skin.

Skin condition of the elderly: Thin skin in the elderly is easily
susceptible to pressure sores.

Poor nutritional status: Anemia and/or malnutrition can result in skin damage.

Bacteria may colonize and/or infect damaged or macerated skin.