Saying “NO” when you should say “Yes” is not uncommon in medicine. Although people should be taking medicine, they don’t. Although they should not smoke, they do.
In the medical literature, this phenomenon is known as “noncompliance with medical advice” and involves several factors.

First, it may be a simple case of not fully understanding the instructions a doctor gives, or perhaps not fully appreciating the importance of those instructions.Second, cultural issues may prevent compliance. Different cultures have different values regarding certain practices—these values may influence what is important in one’s health as well.Third, psychological factors play an important role. Denial, fear and personality are some of the variables that could be involved in a decision.Closely related to this is a specific type of psychological factor, namely “secondary gain”, where a person derives some sort of benefit from not listening to a doctor’s advice.Noncompliance is ever present in health care and continues to represent a serious barrier to receiving proper care.