List of diseases that include muscle weakness as a symptom. Any major, well-known medical conditions associated with muscle weakness are included below, listed alphabetically with photos when available. Any maladies, sicknesses or illnesses with muscle weakness 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. Everything from Multiple sclerosis to Influenza is included on this list.This list answers the questions, "What risks are associated with muscle weakness?" and "What disease can I have if I have muscle weakness?"