One of the most telling warning signs that a patient with an intellectual disability is being under-treated or misdiagnosed is a change in baseline behavior that gets attributed to the disability itself instead of investigated as a potential medical issue. Agitation, withdrawal, sleep disruption, appetite changes, or increased self-injurious behavior are often labeled as "behavioral." In reality, those shifts can signal pain, infection, constipation, dental issues, medication side effects, or other underlying medical conditions. When someone cannot reliably self-report symptoms, behavior becomes a primary clinical language. In those situations, I start by asking a simple but powerful question: "What is this person's baseline?" Caregivers and family members are often the best historians. I want specific comparisons -- What is different today? When did it start? What does a good day usually look like? From there, I approach the assessment systematically and with a low threshold for medical causes. I conduct a thorough physical exam, review medications carefully, and consider common but frequently overlooked sources of discomfort. I also pay attention to nonverbal cues: guarding, facial expressions, changes in mobility, vital sign abnormalities, or sensitivity to touch. Diagnostic overshadowing happens when we stop being curious. The safeguard is discipline -- treating new symptoms as new data until proven otherwise. Even when self-report is limited, patterns, context, and careful observation provide meaningful clinical information. The responsibility is on us to slow down enough to see it.
The single most telling warning sign is a sustained change from the client’s baseline behavior or engagement pattern. When a client cannot reliably self-report, I assess this by careful, repeated observation and by tracking objective behaviors over time rather than relying on one-off impressions. I also gather consistent collateral information from caregivers and staff about routine tasks, initiation of communication, and changes in daily functioning. In my work I focus on measurable indicators of engagement, such as repeat actions or the loss of previously consistent behaviors, as the clearest signal that further evaluation is needed.
In clinical practice, persistent behavioral changes or regression in clients with intellectual disabilities may indicate misdiagnosis or inadequate treatment. To effectively assess such clients, especially those who cannot self-report, a multi-faceted approach is necessary. This includes careful observation of behaviors across different settings and conducting collateral interviews to gather information from family or caregivers, which can enhance understanding of the client's mental health.