It depends. It is hard to say what is going on without a clinical exam and x-rays, If these are recent crowns, you should go back to the dentist to either adjust the bite or check for possible nerve problems. If these are old crowns you may have new cavities or infection around the gums or the nerve. Talk to your dentist he should be able to help you.
See dentist. and have the teeth and the crown checked.
Pain on chewing. See your Dentist. If crowns are new, they may be microscopically high. If old, may be recurrent decay. If teeth are missing other teeth may be drifting and changing your occlusion. Sinuses may be infected. Crowns may be damaged. May have damage to gums/bone. Lots of possibilities. Please see your Dentist.