Preventing bed sores on a bedridden patient comes down to relieving pressure before it damages tissue, keeping skin clean and dry, and making sure the body has the nutrients it needs to maintain healthy skin. When someone can’t move on their own, sustained pressure cuts off blood flow to the skin and underlying tissue. Without intervention, that tissue begins to die, sometimes in as little as a few hours. The good news is that most pressure injuries are preventable with consistent, straightforward care.
Why Bed Sores Develop
Bed sores form when external pressure on the skin exceeds the pressure inside the tiny blood vessels that feed it. Blood flow to the area stops, oxygen levels drop, and toxic waste products build up in the tissue. If the pressure isn’t relieved, the tissue dies. This process can begin when pressure is sustained at levels as low as 32 mmHg, which is roughly the weight of a limb resting against a firm surface.
The areas most vulnerable are places where bone sits close to the skin: the sacrum (base of the spine), heels, hips, shoulder blades, and the back of the head. These bony prominences concentrate the body’s weight into small contact points, making them the first places to break down. Friction from sliding against sheets and moisture from sweat or incontinence accelerate the damage.
Repositioning: The Most Important Step
Regular turning is the single most effective way to prevent pressure injuries. The widely accepted standard is repositioning every two hours, though the ideal frequency depends on the patient’s weight, skin condition, and the type of mattress they’re on. One study found that turning every four hours on a high-quality pressure-relieving mattress actually produced fewer sores (3% incidence) than turning every two hours on a standard hospital mattress (14.3%), which shows that the mattress and the schedule work together.
When repositioning, use a 30-degree lateral tilt rather than turning the person fully onto their side. A full 90-degree side-lying position puts heavy pressure on the hip bone. The 30-degree tilt spreads weight across a larger area, improves blood flow to the sacrum, and increases oxygen levels reaching the skin. A practical nighttime routine looks like this: left side at a 30-degree tilt, then flat on the back, then right side at a 30-degree tilt, rotating through the cycle every two to three hours.
Keep the head of the bed as flat as the patient can tolerate. Elevating the head creates shear forces, where the skin stays in place while the body slides downward. This internal stretching damages blood vessels beneath the skin, especially over the sacrum and tailbone. If the head must be raised for eating or breathing, lower it again as soon as possible.
Choosing the Right Mattress
A standard hospital mattress is not enough for someone who is fully bedridden. Pressure-redistributing surfaces spread the patient’s weight across a larger area, reducing the peak pressure at any single point. Options fall into two broad categories: static surfaces like high-density foam or gel mattresses, and dynamic surfaces like alternating-pressure mattresses that inflate and deflate air cells on a cycle.
Research comparing static foam mattresses to dynamic air mattresses has found similar rates of pressure injury when combined with regular turning. The key difference is cost. For most home caregivers, a quality foam mattress overlay (at least four inches thick, high-density) provides meaningful protection. For patients at very high risk, such as those who are thin, immobile, or have poor circulation, an alternating-pressure air mattress adds another layer of defense. No mattress eliminates the need for repositioning.
Protecting the Heels
Heels are uniquely vulnerable because they have very little padding between bone and skin. The most effective protection is complete offloading, meaning the heel should float in the air with no surface contact at all. You can achieve this by placing a pillow lengthwise under the calf so the heel hangs off the end, completely free. Make sure the pillow supports the full length of the lower leg to avoid transferring pressure to the Achilles tendon.
Specialized foam heel boots are also available and work by cradling the leg while suspending the heel. These are especially useful at night when pillows tend to shift. Avoid ring-shaped or donut-style cushions, which concentrate pressure around the edges rather than relieving it.
Keeping Skin Clean and Dry
Moisture is one of the fastest accelerators of skin breakdown. Urine and stool raise the skin’s pH, which increases swelling of the outer skin layer, disrupts its natural barrier, and makes it far more susceptible to friction damage. Incontinence-associated skin damage and pressure injury often develop in the same areas, and together they’re harder to treat than either one alone.
Skip regular soap and water for cleaning after incontinence episodes. A Cochrane review found that gentle pH-balanced skin cleansers reduced skin damage by about 60% compared to soap and water. Pre-moistened cleansing cloths that combine a cleanser, moisturizer, and skin protectant in one step performed even better, cutting the risk by roughly 70%.
After cleaning, apply a barrier cream or ointment containing dimethicone or zinc oxide to create a moisture-repellent layer. Use absorbent incontinence pads and change them promptly when soiled. Avoid letting the patient sit or lie on bunched-up fabric or pads with wrinkles, as these create concentrated pressure points.
Nutrition That Supports Skin Integrity
The body cannot maintain or repair skin without adequate protein and calories. International pressure injury guidelines recommend 1.25 to 1.5 grams of protein per kilogram of body weight per day for patients at risk. For a 150-pound person, that translates to roughly 85 to 100 grams of protein daily, significantly more than what many older adults typically eat. Good sources include eggs, Greek yogurt, chicken, fish, beans, and protein supplements if eating is difficult.
Calorie intake matters too. Aim for about 30 calories per kilogram of body weight per day, with a balance of fats and carbohydrates to spare protein for tissue maintenance rather than energy. Three micronutrients play outsized roles in skin health:
- Vitamin C is essential for collagen production, the protein that gives skin its structure. It also supports immune function and helps the body fight infection at wound sites. Deficiency leads to fragile capillaries and impaired healing.
- Zinc drives cell replication and protein synthesis. Without enough zinc, the body cannot produce new skin cells or the collagen needed to keep existing skin strong.
- Arginine, an amino acid found in nuts, seeds, meat, and dairy, improves blood flow by promoting the production of nitric oxide (a natural blood vessel dilator). It also enhances wound healing and supports immune function.
If the patient has a poor appetite, small frequent meals, fortified foods, and oral nutrition supplements can help close the gap. Dehydration also compromises skin elasticity, so adequate fluid intake is part of the equation.
Daily Skin Checks
Catching a pressure injury at its earliest stage, before the skin breaks open, makes a dramatic difference in outcomes. Check the skin at every repositioning, paying close attention to the sacrum, heels, hips, shoulder blades, and any area that contacts the bed or a medical device.
The earliest sign of trouble is redness that doesn’t fade when you press on it. You can test this by pressing a finger or a clear piece of plastic gently against the red area for a few seconds, then releasing. If the skin blanches (turns white briefly) and then returns to red, blood flow is still intact. If the redness stays and doesn’t fade at all, that’s non-blanchable erythema, a Stage 1 pressure injury. The tissue beneath is already damaged and needs immediate pressure relief.
On darker skin tones, redness can be difficult or impossible to see. Instead, look for changes in skin temperature (the area may feel warmer or cooler than surrounding skin), firmness, and texture. A patch of skin that feels boggy, hardened, or painful compared to nearby tissue is a warning sign even without visible color change. The patient may also report localized pain or tenderness if they’re able to communicate.
Reducing Friction and Shear
Never drag a patient across the sheets when repositioning. Dragging creates friction that strips away the outer layers of skin and shear forces that damage deeper tissue. Use a draw sheet (a flat sheet folded under the patient’s torso) and lift rather than pull. If possible, use a slide sheet or transfer board to minimize contact friction during moves.
Keep bed linens smooth and wrinkle-free. Dress the patient in soft, non-restrictive clothing without thick seams or buttons at pressure points. If the patient tends to slide down in bed, a foam wedge under the knees can help maintain position without creating new pressure problems.
Knowing the Risk Level
Healthcare providers use the Braden Scale to assess pressure injury risk, scoring patients on six factors: sensory perception (ability to feel discomfort), moisture exposure, physical activity level, mobility (ability to change position), nutrition, and friction/shear. Scores range from 6 to 23, with lower scores indicating higher risk. A score of 15 to 18 signals mild risk, 13 to 14 moderate risk, 10 to 12 high risk, and 9 or below severe risk.
Even without formally scoring, you can use these six categories as a mental checklist. A bedridden patient who is incontinent, unable to reposition themselves, eating poorly, and unable to feel pain in their limbs is at the highest possible risk and needs the most aggressive prevention: frequent repositioning, a pressure-relieving mattress, meticulous skin care, nutritional support, and heel offloading, all happening consistently, every single day.