I'm 23. Missed period for 3months! Blood work came back normal. Whats another alternative for y I missed my period. Pleaseee help me _ _?

Doctor can evaluate. I'm assuming by "blood work" you have had a negative pregnancy test. There are many other causes for irregular menstruation. One common one is polycystic ovarian syndrome (pcos), a hormonal imbalance along with cysts in the ovaries. Though most irregular menstruation is not immediately dangerous, any woman who does not menstruate monthly should consider seeing her doctor.
PCOS. At byour age most frequent reason for irregular periods is polycystic ovarian disease that is usually associated with obesity and hirsutism.See your pcp/gynecologist.