Kumusta ka?
Here are some other ways to say "how are you?" in Tagalog, depending on the context:
* Mabuti ba ang pakiramdam mo? (Are you feeling well?)
* Kamusta ka na? (How are you now?)
* Ano ang lagay mo? (How are you doing?)
* Kumusta ang araw mo? (How is your day?)
* Kumusta ang buhay mo? (How is life?)
You can also use "Ayos ka lang?" (Are you okay?) or "Okay ka lang?" (Are you alright?) as a more informal way of asking "how are you?".