Currently, the whole world is facing the pandemic which is caused by covid-19 or SARS-CoV-2. The corona virus infection with its mutant strains is causing massive, rapid transmission globally. Its most common symptoms are fever, dry cough, headache, running nose, body ache and sometimes diarrhoea too. The underlying medical problems like diabetes mellitus and old age are some factors which may contribute to the severity of the disease. Since, the diabetic patients are immunocompromised; they must take proper care necessary precautions against the covid-19 infection. If there is infection in diabetic patients, then frequent monitoring of blood sugar level is required. The patients with uncontrolled diabetes are at higher risk of hospitalization and mortality. Thus, covid-19 results in worsening of the diabetic conditions. But, the reason behind this is still not clear, as the evidences available are limited.