Background: Tuberculosis is an infectious disease caused by the bacillus Mycobacterium tuberculosis. It typically affects the lungs and also other sites. It causes ill-health among millions of people each year and ranks as the second leading cause of death from an infectious disease worldwide, after the human immunodeficiency virus (HIV). Aim of the study: To Study

1. Epidemiological distribution of TB in dyalia governorate.
2. Relationship between TB and Hypertension.
3. Relationship between TB and Blood group.

Materials and Method: This study was conducted in the chest & respiratory disease center in Baquba city in Diyala government as a cross sectional study from the period of 1st February to 31th July 2017. One hundred patients with TB included in this study. Results: Patients were categorized according to their age, gender, site of infection, type of blood group and relation with hypertension. From (100) patients have tuberculosis most age group affected is 61-70 years (29%), Males are more affected by tuberculosis than females(65%), The most blood group among tuberculous patients is blood group O (36%), Regarding to relationship between hypertension with tuberculosis there is a weak relationship. Incidence of pulmonary tuberculosis is far more than extra-pulmonary tuberculosis (85%). Conclusion: The most age group affected by tuberculosis is 61-70 years old in diyala governorate Males are more affected by tuberculosis than females. The most blood group among tuberculous patients is blood group O. and there is a weak relationship between tuberculosis diabetes mellitus.