le duele la cabeza - my head hurts
or is it I hace a headache
me siento cansado - I am tired???
Check the "le" because no way is it MY head. My head hurts/I have a headache = ME duele la cabeza.
Check what I wrote before: LE duele la cabeza is either HER/HIS/YOUR-singular/formal head aches.
Me siento cansado = YES, I am tired.
Sra