By Pat Anson, PNN Editor

Because pain is subjective and varies from patient to patient, there has long been a debate in the medical community about the best way to measure it.

The two most widely used methods, the numeric 0 to 10 pain scale and the Wong-Baker scale, both rely on patients to self-report their pain levels by assigning a number or a face to it. Someone in severe pain, for example, might rate it an “8” or point to an unhappy, grimacing face to help their doctor understand how much pain they are in.

Not exactly cutting-edge science, is it?

In an effort to find a more useful way to measure pain in the digital age, researchers at Massachusetts General Hospital (MGH) asked 109 patients to rate their pain on a numerical scale and by using an electronic device to select one of six emoji faces modeled after the Wong-Baker scale. The patients suffered from abdominal, chest, back or extremity pain, and were admitted for emergency care or surgery at MGH.

The study findings, published in JAMA, showed no discernible difference between the numerical and emoji scales – suggesting that digital emojis can be useful in collecting patient health data, particularly for young children and individuals with different cultural, language and cognitive abilities.

"By demonstrating concordance between emoji and the numerical pain rating scale, we've validated the use of emoji as an accurate, open-source and economical alternative to popular visual analog pain scales such as Wong-Baker," first author Shuhan He, MD, an MGH emergency department attending physician, said in a press release.

"Because emoji are open source and digital, they could encourage collection of data on a patient's condition over days, weeks, or months—information that could then be integrated into electronic health records and documented on patients' charts."

Rather than just an online fad, Dr. He and his colleagues say colorful emoji symbols could be a practical and imaginative way to break down communication barriers in the hospital setting.

"If a clinician doesn't understand the patient due to a language barrier or disability, it's tantamount to no treatment at all," said senior author Jarone Lee, MD, vice chief of Critical Care and Trauma Emergency Surgery at MGH. "Among populations that could benefit are patients in the intensive care unit who may have difficultly speaking, such as those on mechanical ventilators who need an alternative way to characterize their pain to caregivers."

Digital emojis originated in Japan over a decade ago. Of the 3,500 emoji symbols approved for use by the Unicode Consortium -- a nonprofit that maintains uniform text standards for computers — only 50 are relevant to medicine.

The first medical emojis, introduced in 2015, were the syringe and the pill. Emojis have since been added to represent disability, a stethoscope, bone, teeth, heart and lungs. Dr. He is working with professional medical societies to develop more emojis – including ones to represent pain -- with the goal of getting them approved by the Unicode Consortium.

He believes medical emojis could become mainstream tools for enhancing diagnosis and treatment. In emergency room cases where timing is critical, emojis could lead to a point-and-tap form of communication that bridges language gaps and speeds clinical decisions.

"As physicians, our job is to know how patients feel," Dr. He said, "and the use of emoji allows us to make that process more equitable and thus improve healthcare delivery for all patients in a very meaningful way."