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The quality of doctor-patient communication is critical for the practice of medicine. Studies show that effective communication results in patient satisfaction and improved compliance. To better understand one aspect of this complex phenomenon we estimated the ability of people to comprehend 11 commonly used medical terms. We used multiple choice questions in a telephone survey of 1167 Icelanders aged 16-75 years. Results (% of participants with correct answers): Gastroesophageal reflux (72), emphysema (25), steroids (40), one tablet twice a day (79), side effects (67), bronchitis (68), white blood cells (56), erythrocyte sedimentation rate (33), diabetes mellitus (72), antibiotics (87), chronic obstructive pulmonary disease (42). Variables associated with better comprehension were: Female gender (better in 7/10 questions), university degree (10/10) and high income (9/10). Decision tree analysis showed that education had the most impact. The youngest participants (age 16-24) had the worst outcome in seven out of 10 questions. The results define certain medical terms that require more careful explanation than others. They also indicate that those of young age, low socioeconomic status and less educated require more help in understanding medical terms. Interestingly, 21% of participants failed to understand a very simple medication order, emphasizing the importance of explaining these in detail. The data may also have implications for informed consent. A larger study exploring the public comprehension of multiple medical terms should be considered.