Despite all new inventions regarding atrial fibrillation (AF) treatment, this disease remains one of great incidence between cardiac patients (0,1% in young and 2% in old ones anually). The prevalence of the disease is up to 0,4% in the general population, and has the tendence of rising over 6% in elders. Besides congenital issues(such as accessory pathways), at risc to develop AF are patients with:arterial hypertension,cardiac insufficiency (CI), cardiac ischemia, dilated atria(DA), pulmonary hypertension (PHT), dyslipidemia, diabetus mellitus, obesity, prosthetic valves. 20-30% of those who suffered a stroke have been diagnosed with AF before, during or after the ischemic attack. By 2030, 14-17mln new patients are estimated to be diagnosed with AF. Considering the facts listed above, the purpose of the study was to evaluate the thromboembolic risk (TER) haemorrhagic risk (HR) related to the clinical features in patients. In this research 140 patients were included. The tools of analysis used were clinical and instrumental data of the patients and CHA2-DS2-VASc, and HAS-BLED scale. Patients were divided in 3 groups to evaluate the TER: the first group scored 1-3 points on the TER scale (42 patients); the second 4-6 points (94 patients) and the last one ˃6 points (4 patients). To evaluate the HR patients weren’t divided in groups. All patients take anticoagulant pills. Higher TER (4-6 and ˃6 points) was found in patients with: persistent (41%) and permanent (21%) AF; DA (both atria-61%: slight-7%, moderate-33%, severe-21%); high LDL level (˃3,5 mmol/l - 54%,where 11% have >5,0 mmol/l); PHT (41% moderate,13%-severe); CI (49%-NYHA II;19%-NYHA III). 11% of patients have high HR (˃3 point on HR scale). These patients have DA (moderate or severe), persistent or permanent AF, high LDL level, CI NYHA II-III, but the latter also have labile INR due to uncontrolled uptake of anticoagulant pills, or lack of INR evidence. In conclusion, a matter of great concern is monitoring the course of the TER and HR, considering the evolution of CI, PHT, dyslipidemia, enlargement of atria, cardiac rate and thus providing an appropriate treatment and a high quality of life. These 2 scales provide an overview of the patient's disease status and guide doctor’s treatment actions. Worth to mention is the thing that,my research shows that the TER is bigger than HR in those with AF, even if anticoagulant pills are taken. HR is inflicted by uncontroled anticoagulant treatment or other associated diseases.