The document lists and categorizes several common illnesses and diseases affecting the brain, heart, and those caused by viruses. Under brain diseases, it mentions aphasias, schizophrenia, neuroscience diseases, and Alzheimer's disease. Heart diseases include angina pectoris, myocardial infarction, arrhythmias, heart failure, and cardiomyopathy. Virus diseases covered are dengue, Ebola, yellow fever, flu, hepatitis B, herpes, mononucleosis, and measles.