Physical illness, pain, and problem behavior in minimally verbal people with developmental disabilities.

Neuringer et al. (2007) watched problem behavior on days when clients felt sick and days when they felt fine. All clients had developmental delays and used few or no words. The team compared behavior counts with daily pain ratings.

They treated each client as their own control. No new treatment was tested. The goal was to see if pain and illness act as hidden triggers for hitting, screaming, or self-injury.

Problem behavior happened more often and more intensely on sick days. Higher pain scores matched higher behavior counts. The link showed up in every client tracked.

In plain words: when the body hurts, behavior worsens.

Fahmie et al. (2013) extends this message to 255 institutionalized adults. They found that 18 % showed signs of pain, yet 85 % had no pain medicine ordered. Together the two papers paint the same picture: pain is common, missed, and expressed through behavior.

Eberhart et al. (2006) used the same single-case method but tracked blood glucose instead of pain. High glucose also paired with more problem behavior. The pair of studies shows that any hidden body stress—pain or sugar swings—can push behavior up.

Scherf et al. (2008) looked at Medicaid records and saw kids with autism had seven times more self-inflicted injuries. Their data line up with Neuringer et al. (2007): when health is off, behavior becomes riskier.

Before you write a behavior plan, rule out pain or illness. Check for fever, ear infections, constipation, or injuries. Add a quick pain scale to your intake forms. Track sick days on your behavior graphs. A simple note like “client had cold” can explain a sudden spike and save weeks of useless intervention.