This cross-sectional study aims to determine the association between overcrowding and Rheumatic Heart Disease among cardiovascular patients in the University of the Philippines - Philippine General Hospital using a random hospital-based sample of 72 Filipino male and female cardiovascular patients aged 15-34 years old. All questionnaires were answered through an interview-guided approach conducted in the Filipino language. Among the 72 subjects, 17 were found to be diagnosed with Rheumatic Heart Disease based on the WHO echocardiogram criteria and among these 17, only 6 fit the overcrowding criteria, resulting in a p-value of 1.000. The study shows that there is no association between overcrowding and Rheumatic Heart Disease. Analysis done on the other variables in association with Rheumatic Heart Disease also showed similar results.