何(なに)か

なにか
pronoun
something
1. something
An unspecified thing or matter.
何(なに)か食(た)べたい。
I want to eat something.
Can I help you with something?
何(なに)か飲(の)みますか。
Would you like something to drink?
There was some noise outside.
2. anything
Used in questions and conditional sentences to mean 'anything at all.'
Is there any problem?
Used to ask about existence
Please contact me if anything happens.
何(なに)か欲(ほ)しいものある?
Is there anything you want?
If there's anything you don't understand, ask me.
Are there any questions?
3. somehow, for some reason
Used adverbially before an adjective or verb to say that something feels a certain way without the speaker being able to name the cause.
何(なに)か変(へん)だ。
Something feels off.
Adverbial use: 何か modifies 変, not a noun
Somehow I feel lonely.

Usage: 何(なに)か points at a thing without identifying it. In statements it is "something"; in questions and conditionals it is "anything". Before an adjective it works adverbially and means "somehow".

USAGE (particles):
何(なに)か normally drops the が or を that its grammatical role would call for: 何(なに)か食(た)べる, not 何(なに)かを食(た)べる. Other particles do attach: 何(なに)かに使(つか)う (use it for something).

Functions

1. Something (statement): 何(なに)か音(おと)がした (I heard something)
2. Anything (question or conditional): 何(なに)かあったら (if anything happens)
3. Somehow (adverbial, before an adjective or a feeling): 何(なに)か変(へん)だ (something feels off)

Common patterns

REGISTER (spoken variant):
なんか is the casual contraction. It covers the same ground but also works as a filler word and as a dismissive "things like", so it is not a free substitute in careful speech.

RELATED WORDS (indefinite pronouns):

The も forms do not all match: 何(なに)も and 誰(だれ)も take a negative (nothing, no one), but いつも means "always" and どこも "everywhere".