List of diseases that include somnolence as a symptom. Any major, well-known medical conditions associated with somnolence are included below, listed alphabetically with photos when available. Any maladies, sicknesses or illnesses with somnolence as a symptom can be seen below. For any real, further diagnosis of something you feel you might have, please consult a doctor. This list includes information about each disease, such as what risks are associated with it. This list has a variety of illnesses, like Parkinson's disease and Iron deficiency anemia, in it.This list answers the questions, "What risks are associated with somnolence?" and "What disease can I have if I have somnolence?"