They could be many conditions. However, with that medical history (diabetes and high blood pressure) it would be easy to think of a heart attack. Since patients with diabetes are more likely to suffer and this probability increases at a more advanced age, and if the patient manages high blood pressure, his heart works too hard to pump the blood, which can lead to the breakdown of one of the plates and thus form a clot. The interruption of blood flow can damage or destroy a part of the heart muscle causing a myocardial infarction (heart attack). Among the warning symptoms is pain at the level of the heart valve, chest pressure with a feeling of discomfort and being full, as well as diarrhea.
