We all have closets. Thats where we put anything we don't want to deal with. The body also has closets. There we store any conflict that wasn't resolved. If we fail to resolve a cold or a virus it can hide in the body and become latent. 

It comes out of latency usually - when we are exhausted, stressed or sleep deprived. You know those issues that show up when you are stressed out? they have been there all along....