Background: Diabetes mellitus is accountable for a wide variety of cardiovascular diseases (CVDs), which are the chief reasons of mortality in diabetic individuals, and various influences, comprising hypertension, contribute to this extraordinary prevalence of CVD. The most important reason for morbidity and mortality in diabetes is a cardiovascular illness that is intensified by hypertension. The objective of this review article is to discuss evidence of hypertension and coronary heart ailment in diabetic patients. Method: This is a systematic review was carried out, including PubMed, Google Scholar, and EBSCO. Topics concerning hypertension and coronary heart disease in diabetic patients and other articles were used in the making of the article. The founded articles were screened by titles and reviewing the abstracts. No software will be utilized to analyze the data. Double revision of each member’s outcomes was applied to ensure the validity and minimize the mistakes. Results and Conclusion: The review included 10 randomized studies. Diabetes mellitus (DM), hypertension (HT), and coronary heart disease (CHD) are closely related. DM is a well-known risk factor for CVD generally including CHD. The prevalence of DM, HT, and CHD is growing worldwide. Lifestyle changing and treatment adherence are essential for the prevention of morbidity and mortality related to both diseases and play a major role in the occurrence of these diseases.