They are the reflection of your not allowing your natural Connection. It’s nothing more complicated than choosing better feeling thoughts.
For example, you just had a weak moment, and now you feel guilty. Guilt causes cancer, and all kinds of other things. You felt fear. Fear causes cancer. Fear or anger or jealousy, or guilt, are your indicator that the thought you are choosing is contradictory to, and is, hindering, the Source Energy.
The key is to not give anything that you do not want much of your attention. As soon as you realize it doesn’t feel good — do your very best to turn your attention someplace else.