Understanding ICU nurses’ pain management behaviours: A qualitative study guided by the COM-B model

In the high-stakes environment of an intensive care unit, patients are often too sick to speak. They may be sedated, intubated with breathing tubes, or simply too weak to communicate. In this silence, pain becomes a hidden enemy. It is a common and distressing experience that, if left untreated, can lead to longer recovery times, confusion, and even chronic suffering long after a patient leaves the hospital. While doctors and nurses have clear guidelines on how to treat pain, the reality of the bedside is far more complicated. A nurse cannot simply ask a patient if they hurt; they must read subtle clues like a furrowed brow, a sudden movement, or a change in heart rate. These signs are ambiguous, often looking the same as anxiety or the body's reaction to other illnesses. The challenge is not just knowing the rules, but figuring out how to apply them when a patient cannot say a word, when the team is overwhelmed, and when the clock is ticking.

To understand how nurses navigate this difficult landscape, researchers from Sir Run Run Shaw Hospital in China conducted a deep dive into the minds and daily experiences of twenty-one intensive care nurses. Published in September 2026, this study moved beyond simple checklists to explore the human and environmental forces that shape how pain is managed. The researchers used a framework called the COM-B model, which breaks down any behavior into three parts: capability, opportunity, and motivation. In plain terms, capability asks if the nurse has the knowledge and skill to do the job; opportunity asks if the environment and team allow it to happen; and motivation asks if the nurse feels driven to prioritize it. By interviewing nurses in eight different intensive care units, the study revealed that pain management is not a linear task of following orders, but a complex, ongoing process of judgment and adaptation.

The researchers found that the ability to manage pain effectively starts with what the nurses know and how they think. While most nurses could give medication as prescribed, many felt unsure about adjusting doses when a patient's reaction was unpredictable. Some admitted they hesitated to change a treatment plan because they did not fully understand the differences between the drugs or how individual patients might metabolize them. Beyond just drug knowledge, the study highlighted the difficulty of interpreting pain in a patient who cannot speak. Nurses described the challenge of distinguishing between a patient in pain, a patient who is confused, and a patient who is simply anxious. One nurse noted that even with objective tools, the assessment remained subjective, influenced by their own experience and intuition. The most skilled nurses were those who could look at a patient's entire condition—checking if a tube was blocked or if a wound was the true source of distress—rather than simply increasing the dose of painkillers. They acted like detectives piecing together a puzzle, using their clinical experience to decide what was really happening.

However, having the skill to recognize pain is only half the battle. The study showed that even when a nurse knows what to do, the environment often gets in the way. This is where the concept of opportunity comes in. The researchers found that the culture of the hospital unit played a massive role. When managers and doctors consistently emphasized pain relief, nurses paid closer attention. Conversely, if the team focused only on life-saving measures, pain management was often pushed aside. Communication was another critical hurdle. Nurses frequently described feeling like messengers who had to chase down doctors to get approval for pain medication. They reported that their assessments were sometimes ignored or that they lacked the authority to act without a physician's order. Furthermore, practical resources were often scarce. Medications might not be in stock, or insurance and financial concerns might limit the choices available. In a busy unit with too few staff, a nurse might simply be unable to monitor every patient closely enough to catch a sudden spike in pain, no matter how much they wanted to help.

The final piece of the puzzle is motivation, or the internal drive that pushes a nurse to act. The study revealed that most nurses felt a deep professional responsibility to relieve suffering, viewing it as a core part of their job. They wanted to prevent fear and trauma in their patients, even if the patients would never remember the experience. Yet, this drive is fragile. When a patient's condition became critical and their blood pressure dropped, saving their life naturally took precedence over managing their pain. The nurses described a constant balancing act where pain management was the first thing to be overlooked during a crisis. Additionally, the emotional toll of the job could wear them down. While they wanted to be compassionate, the relentless pace of the intensive care unit led to exhaustion, making it harder to sustain that same level of emotional engagement over time. The study also noted that how hospitals measure success matters; when nurses were evaluated on how well they filled out paperwork rather than how well they actually managed pain, their focus shifted to checking boxes rather than caring for the patient.

The researchers synthesized these findings into a new way of understanding the process. They proposed that pain management is not a single event but a continuous loop. It begins with assessment, moves to judgment, then to decision-making, followed by action, and finally, an evaluation of the result. This cycle repeats constantly as the patient's condition changes. The study suggests that capability, opportunity, and motivation do not work in isolation; they interact at every step. A nurse might have the skill to judge pain correctly, but without the opportunity to communicate with a doctor or the motivation to prioritize it amidst a crisis, the care will not happen. Conversely, a highly motivated nurse with the right resources will still struggle if they lack the specific clinical knowledge to interpret a patient's confusing symptoms.

Ultimately, this research suggests that improving pain management in the intensive care unit requires more than just teaching nurses more about drugs. It demands a shift in how the entire system operates. The authors argue that we need to move beyond simple knowledge-based training and instead focus on building complex clinical judgment. We need to create environments where communication between nurses and doctors is seamless, where resources are reliable, and where the culture values pain relief as much as life support. The study concludes that effective pain management is a dynamic behavior, shaped by the convergence of what nurses know, what their environment allows, and what they feel compelled to do. By understanding these interactions, hospitals can design better support systems that help nurses translate their good intentions into consistent, effective care for the most vulnerable patients.