How does pressure ulcer develop?

Anyone who stays in one place for a long time and who cannot change position without help is at risk of developing pressure sores. The ulcers can develop and progress rapidly, and they can be difficult to heal. Sustained pressure can cut off circulation to vulnerable parts of the body. Without an adequate supply of blood, body tissues can die.

There are many factors may cause pressure injury：

Also, the tolerance of soft tissue for pressure and shear may be affected by microclimate, nutrition, perfusion, co-morbidities and condition of the soft tissue.