Do not capitalize disease names or medical terms. AP Style suggests that:
“Do not capitalize arthritis, emphysema, leukemia, pneumonia, etc. When a disease is known by the name of a person or geographical area identified with it, capitalize only the proper noun element: Alzheimer’s disease, Parkinson’s disease, Ebola virus, etc.”
Capitalization is tricky even for native speakers. You can learn why Ebola is capitalized and further explore capitalization topic here.