First of all, we have 3 full baths in our home. We are having this problem in only one... the main floor bath.
When I turn on the water at the spigot in the shower, I get ONLY hot water. In the sink in the same bathroom, I get both hot and cold.
I am a 66 year old woman and I don't know much about plumbing, so please try to give your answer in terms I'll understand. Thanks !