Loneliness is an emotion that can be difficult to pin down because it often means different things to different people. It can be a perception of isolation because we feel that we aren’t being heard and valued. It can be caused by feeling that there is no one we can turn to for emotional support. Also, in many instances, a lonely person is actually physically alone through the loss of a spouse or loved one. Regardless of how we define loneliness, however, researchers have concluded that feeling so alone can affect not just our mental and emotional well being, but our physical health, as well. And, they are finding that loneliness can be as contagious as a virus.