Pressure Ulcer Stages Explained: A Guide for Families

When a nurse tells you that your mother has a stage 2 pressure ulcer on her heel, or that your father has a suspected deep tissue injury, the words can sound alarming and confusing at the same time. Families often nod along without really knowing what the label means or whether it is getting better or worse. This article offers the pressure ulcer stages explained in plain language, based on the classification used by the National Pressure Injury Advisory Panel (NPIAP) in the United States. The goal is not to turn you into a wound nurse, but to help you understand what the team is describing, ask better questions and recognize when something needs attention quickly.

Why staging matters, and a note on the words

Staging describes how deep the damage goes, from a change in intact skin to a wound that reaches muscle or bone. It guides treatment, helps the team track progress and gives everyone a shared language. You will hear several names for the same problem: bedsore, pressure sore, decubitus ulcer, pressure ulcer and pressure injury. In 2016 the NPIAP, then called the National Pressure Ulcer Advisory Panel, began using the term pressure injury, partly because early stages involve intact skin rather than an open ulcer. Many hospitals, nursing homes and insurers still say pressure ulcer, so both terms are correct in everyday conversation. What matters more is the stage and the trend over time.

The four numbered stages, one by one

With the pressure ulcer stages explained one at a time, the logic becomes clearer: each number goes one layer deeper into the body. The stage is assigned by a trained professional who looks at the wound, and sometimes it cannot be known until the wound has been cleaned or has evolved over a few days.

• Stage 1: the skin is intact but shows a localized area that does not blanch, meaning it stays red when pressed gently. On darker skin the color change may be harder to see, so warmth, firmness, swelling or pain in the area are important clues.
• Stage 2: partial-thickness skin loss. The wound is shallow, pink or red and moist, or it may look like an intact or broken blister filled with clear fluid. Fat and deeper tissues are not visible.
• Stage 3: full-thickness skin loss. Fat may be visible in the wound and the edges can be rolled, but muscle, tendon and bone are not exposed. Depth varies depending on where on the body it is.
• Stage 4: full-thickness loss of skin and tissue, with exposed or directly palpable muscle, tendon, ligament, cartilage or bone. These wounds carry a higher risk of serious infection and usually take a long time to heal.

Unstageable and deep tissue injuries

Two categories sit outside the numbered stages. An unstageable pressure injury is one where the base of the wound is covered by slough (soft yellow, tan or gray tissue) or eschar (a dry, dark scab), so the team cannot see how deep it goes. It is still a full-thickness wound, which means it is at least stage 3 underneath. A deep tissue pressure injury appears as a persistent deep red, maroon or purple area, or a blood-filled blister, on intact or broken skin. It reflects damage at the junction of bone and muscle, and it can evolve rapidly into a deeper wound over the following days, even with good care. The NPIAP also describes injuries caused by medical devices, such as tubing, splints or oxygen masks, which are staged using the same system.

What healing looks like in geriatric care

One detail surprises many families: stages are not reversed as a wound heals. A stage 4 ulcer that is filling in is described as a healing stage 4, not as a stage 3 or 2, because the tissue that grows back is scar tissue and is never quite as strong as the original. Healing in older adults is often slow, and it depends on factors geriatricians watch closely: nutrition and hydration, circulation, diabetes control, infection and overall frailty. Continued pressure on the area is the most common reason a wound stalls. At the end of life, some people develop skin changes that cannot be prevented despite excellent care, as the body's systems begin to fail. In those cases, the focus usually shifts to comfort, and the team should explain this to the family honestly and gently.

Pain, silence and the feeling of being a burden

Pressure injuries are painful, yet many older adults say little about them. Psychology and palliative care research describe a phenomenon called self-perceived burden: the worry of being a nuisance to caregivers or family, which can lead people to minimize symptoms and avoid asking for help. Some older adults also grew up believing that pain is simply part of aging. People living with dementia may not be able to describe pain at all and may show it instead through restlessness, grimacing, refusal to move or changes in behavior. Families are often the first to notice these subtle signs. Gently asking specific questions, such as whether a particular spot hurts when they lie on their back, and sharing your observations with the nurse can help ensure pain is treated and the wound gets proper attention.

When to call the nurse or doctor

Having the pressure ulcer stages explained is useful, but recognizing warning signs is even more important. You should contact the nurse or doctor the same day if you notice any of the following: a red or discolored patch that does not fade within a short time after pressure is removed, a new blister or open area, a wound that looks larger, deeper or darker than before, a bad smell, increased drainage or pus, redness and warmth spreading around the wound, new or worsening pain, or fever, chills or sudden confusion. In older adults, an infection may show up mainly as confusion or unusual tiredness rather than a high temperature, so trust your sense that something has changed. Do not try to treat an open wound with home remedies; dressings and cleaning should follow the care plan.

It also helps to ask a few concrete questions at care plan meetings: what stage the wound is, how it has changed since the last assessment, what the repositioning and support surface plan is, whether a dietitian is involved, and how pain is being managed. Our guide on working with the nursing home care team offers ideas for raising concerns calmly, and you can learn what is usually recorded in nursing home charting systems so you know what to ask to review.

Between visits, Palermia helps you stay close to the details that affect healing. You can see photos of your parent's day, check what they ate at every meal, follow the medication record and send a direct message to the care team when you have a question about the wound or notice something new. That way you hear about changes sooner and can ask the right question at the right time. See how it works

Having the pressure ulcer stages explained will not make a wound heal faster on its own, but it can make you a calmer and more effective partner in your parent's care. Keep notes, ask for explanations whenever a term is unclear, and remember that the nurse, wound specialist or doctor is the right person to judge any change. You do not have to carry this alone.