Cliff, it is a great idea and a wonderful place, given ample light, to grow moth orchids in the bathroom! They love lots of moisture and high humidity :)

Could you describe how you are growing your cattleya? Medium, pot, light? Could be a combination of factors, and overwatering is a good guess...maybe post a picture?

Olya

Olya,

I have the Cat in the orchid mix you buy at the big box store and in a clay orchid pot just sitting on the patio. It would get some sun. I watered it everyday for the past two weeks. I moved it out of sight yesterday afternoon to see what happens. Cliff

By the way, I dont have my camera. A friends is borrowing it to take pics of her new pugs

I checked the cat this morning and the yellow piece is now brown. Should I just leave it be and see what happens? It may put out new growth?

This is why Orchids scare me. lol I love them to death. lol

Thanks, Cliff

Watering everyday might the culprit. Cattleyas need to dry out between waterings - they have pseudobulbs where they store water for that. I water mine once a week during Winter/Fall/Beginning of Spring, and during the growing season - twice a week
You can cut the brown piece off and maybe sprinkle the cut with some cinnamon. Maybe, use some fungicide on the plant - soak it up, and after that, slow way down on watering...
It sounds your orchid is having some kind of fungal problem, from too much watering - but that is just a guess :)

The reason I like cattleyas is that you can forget about watering them, and they will actually appreciate that!
Olya

Mist Vandas daily, but only water your Orchids once or twice a week. Anything that turns yellow is going to turn brown and then fall off.