Regarding the results of this research, decreasing blood glucose pills taken as a method of controlling disease for 58.6% of patients; moreover, in the study of Heydari et al. (
22), the kind of treatment in most patients (62%) was taking pills. Based on research findings and according to patient’s statement, 76% of samples used recommended treatment to control their disease and mean glycosylated hemoglobin of patients was 7.46 ± 1.14 and the most patients (78.7%) had glycosylated hemoglobin of 7% and more than 7%, which means they were in the uncontrolled status of diabetes. In the study of Esmailnasab et al. (
23), mean glycosylated hemoglobin was 7.2 ± 1.6, and 73.2% of patients were in the uncontrolled status of diabetes. Moreover, in the study of Mansour (
24) conducted in Iraq, glycosylated hemoglobin of most patients (76.3%) equaled 7% or more than 7% and mean glycosylated hemoglobin was 8.4 ± 2, which confirmed our study and these results showed non appropriate status of controlling blood glucose in patients with diabetes (
24). Moreover, the major information source of diabetes for patients included mass media (22.7%) and educational books and booklets of health-care centers (22.7%) and also the major source for getting information was radio and TV (23.2%) based on the results of Rashidi and Ghasemi (
25). In addition, the major information source was newspaper (66.7%) based on Hsu and Yoon (
26) and these results may indicate that diabetic patients have used this medium more than other media because they had access to it. In the family group, the information source of diabetes was mass media and as family members stated, 78.7% had not received any formal education about diabetes and 62.5% received formal education about diabetes through the diabetes association. As stated in the study of Bahrami Nejad et al. (
27), family can be considered as a social place to educate for changing behavior of society members and educating clients along with their family and making families cooperate in an educational plan can increase people’s ability to make and preserve changes of lifestyle. In the nurses group, based on the statement of participants, 88% of nurses had not passed formal education about diabetes and 12% had passed formal and specialized education courses about diabetes; these results indicate the necessity for specialized education for nurses employed at the diabetes association and interior wards of hospitals. In this direction, Torres et al. (
28) showed that employees of the health field need to increase their knowledge and preparation for different aspects of diabetes and pay more attention to patients’ issues and assessment of interference in order to promote the control of diabetes. Based on the results of Abazari et al. (
29), although, preventing and controlling diabetes had formally been put among the health priorities since 15 years ago and significant efforts were dedicated to education of patients and people who are at risk and even the general public, in this field and alternatively this task basically assigned to nurses and they have defined role of “the educator nurse” but, in this field, just one period with 8 learners implemented in 1389; the findings of this article and results of the present study showed the necessity for diabetes specialized education for nurses who educate about diabetes. In the present study, lack of specialized centers presenting services (associations and clinics) to patients with diabetes was among the most important and high priority barriers from the viewpoints of all three groups. In the study of Abazari et al. (
18), non-appropriate distribution of medical centers was reported as an obstacle by participants, who tended to follow medicinal diet and participate in an educational plan implemented by medical centers. Not spending enough time by medical staff to answer the family and patients’ questions was one of the important obstacles from the viewpoint of families and patients and there was a statistical significant difference between the viewpoint of nurses and patients and their family (P = 0.0001). In addition, the necessity of educating patients has been confirmed by the study of Caliskan et al. (
30) but this cannot be implemented because of the lack of time and low number of nurses; these results were consistent with the findings of our study. In the present study, not following the patient’ treatment at home by a nurse with mean score of 3.61 was an important barrier, and it was the third barrier related to health-medical systems. As stated by Shirazi and Anousheh (
31), there are different educational courses for nurses to prepare them for educating about diabetes in different Asian and European countries, yet Iran is facing problems such as lack of nurse staff. In the present study, the barrier of not paying attention to family and patients’ beliefs and culture by medical staff was of high importance; in this direction, the results of Ali and Jusoff (
32) showed that health experts related to diabetes management need to understand patients’ beliefs and limitations. In addition, based on the results of Shakibazadeh et al. (
33) educating about diabetes must be based on culture-centered interference and designed based on the viewpoints of patients and employees, who are in direct contact with patients. The other important barrier stated in the present study was not repeating the educational classes and there was a significant difference between the viewpoints of nurses and patient (P = 0.005) and the viewpoints of nurses and family members (P = 0.01). Moreover, in the study of Uchenna et al. (
20), 73.5% of participants mentioned irregular educational sessions and 84.8% mentioned limited number of sessions as barriers for not following their medicinal diet to control diabetes, that agree with the results of our research. In the present study, lack of insurance support was among the most important barriers related to medical-health systems of controlling diabetes from the viewpoints of the three groups. In this direction, results of the study of Rahimian-Boogar et al. (
34) showed that self-management of diabetes in patients, who have insurance and insurance support was significantly higher in comparison with individuals with no insurance (P = 0.001). Significant differences were observed between mean scores of barriers related to medical-health systems (P = 0.0001) that were not observed between mean scores from the viewpoint of patients and nurses (P < 0.0001) and between the viewpoint of patients and family members in barriers related to medical-health systems based on Tukey’s separation test (P = 0.58); therefore, in the present study, existence of a considerable difference between the viewpoint of nurses and patients and families in caring and controlling diabetes is completely evident regarding barriers related to medical-health systems that is one of the reasons for failure to control blood glucose. As stated previously, the criteria for achieving success and controlling blood glucose is to have consistent teamwork and more coordination with the viewpoint of patients and their family; therefore, if planning designed by medical staff to control blood glucose and diabetes disease is not confirmed and accepted by patients and their family because of different viewpoints in this field, a rift being made in the function of these groups in practice that would not conform to each other and its result would be non-access or imperfect access to desirable controlling diabetes. In this direction, results of Pun’s study (
35) showed that people presenting health care can make their medical aims possible by making patients skilled and supporting family members, and the first step to make patients skilled is to overcome barriers and to know barriers for controlling diabetes from the viewpoints of medical staff and patients. In Shahady’s study (
36) that was conducted in Florida patients and their family members were among important members of diabetes-controlling team and their cooperation in treatment caused better self-management and medical staff were required to know the viewpoint of patients and their family about barriers. Therefore, based on the results of Nam et al. (
16), formally recognizing the cooperation relationship between patients and medical staff is of importance in managing diabetes disease and would result in cooperation of patients, families and medical staff in disease management. Regarding the significant differences between the viewpoints of these three groups in this study, perhaps these differences account for the lack of success in controlling patient glucose levels, because medical teams focus on barriers that are not so important to patients and their families, while barriers which are important to patients and their families are less considered by members of the medical team.