9. Nausea, Vomiting or Dry Heaving (Retching)
These three symptoms are quite common for a variety of diseases and illnesses. Nausea is the feeling you get when you want to vomit, vomiting is when you expel the contents of your stomach and retching, or dry heaving is just like vomiting except you aren’t expelling anything, and it can be very painful on your chest. When you are frequently experiencing either one of these or all three, it would be a good idea to visit the doctor to be able to determine the cause of your nausea, vomiting, and retching.