Lighting, Light Fixtures, Ceiling and Exhaust Fans - powering a ceiling fan

I have an NM power line that goes down a wall into an outlet and is controlled by a switch on the wall.

I was thinking of powering a lighted ceiling fan by just running NM wire from the fan down the wall to the switch and pigtailing it to the switch. Will this work or should I do something else?

Thanks,

50/50 chance. If there is a white wire currently connected to the switch, then your plan will not work (but an alternate plan will). If there is no white wire currently connected to the switch, but there are other white wires in the box, then your plan will work.

Whether or not there are other code issues involved depend on what room this in is. (This is a hint that I'd like you to tell me what room it is in--not everybody seems to get this hint.)

It is in a bedroom.

There is a black wire and a white wire in the switch box. Each is connected to the switch. that is it.

Looks like the hot NM cable goes down into where the plug outlet is and there is some sort of relay going to the switch box.........
If you look at the rough picture I tried to put together you have a hot wire running to an outlet and a relay to a switch inside the wall. I was thinking of pigtailing a new wire that is run down the wall to the switch box from the fan but am unsure if it will provide power.
If my idea doesnt work do you have any others?

|(hot wire running down wall)
|
| -[] (switch)
| -
| -
[}-
(outlet)

You are using the term "relay". Is this low voltage lighting?

There is no relay here (at least I highly doubt it). What you have is called a "switch loop".

The next step is for you to tell us all the wiring at the receptacle. Shut off the circuit breaker (not merely the wall switch), gently pull the receptacle out of the box without disconnecting anything (so you can see clearly), and describe everything you see.

Then tell us (1) whether you want the receptacle to continue to be switched, (2) whether you want this existing switch to control the ceiling fan or whether you plan to add a second switch, (3) if you are planning to use an ordinary switch for the fan or a fan-specific switch, (4) whether you want the wall switch to control the fan motor, the fan light, both with one switch, or each on its own switch, and (5) whether the fan will have a remote control.

I repeat again that the way you are currently thinking about this will not work.