Formal:
* Kumusta ka? (This is the most common and general way to ask "how are you?")
* Mabuti ba ang pakiramdam mo? (This means "Are you feeling well?")
Informal:
* Kamusta? (This is a shorter and more casual way to say "how are you?")
* Okay ka lang? (This means "Are you okay?")
* Anong balita? (This means "What's new?")
Adding respect:
* Kumusta po? (This adds a polite "po" to the formal "kumusta")
* Mabuti ba ang pakiramdam mo po? (This adds a polite "po" to the formal "Mabuti ba ang pakiramdam mo")
The best way to choose which phrase to use depends on who you are speaking to and the situation.