Why does my jaw make a loud noise when I chew?

TMJ disfunction. Tmj means temporomandibular joint disfunction can produced pain in the jaw , furthermore with is associated to pain in the joint and bruxism( grinding teeth at night) may produced pain and headaches and trismmus. The initial part of the TMJ dysfunction is jaw noises , i will get check it.
Probable jaw joint. There is probably a dysfunction in your jaw joint. I would suggest seeing your dentist or a dentist who specializes in that field. See www.Aaop.Org or www.Aacfp.Org for a dentist in your area.