Losing hair or becoming suddenly and completely bald are two common dream events. Often dreams of this nature reflect concern about your attractiveness or sexual virility. If you are forcibly shaved during your dream, this may be a concern over sterilization, as hair often plays a significant role in male gender identity.
For many men and some women, the loss of hair in dreams may also reveal anxiety about growing old. Even if the dreamer is not showing signs of balding in waking life, he may lose his hair in an age-anxiety dream.
Yet another possible interpretation of hair loss in a dream is the feeling that an illness of some sort may be imminent.