Wheni chew my jaw hurts?

TMJ vs GCA: In your age group this is sometimes a worrisome sign known as jaw claudication and can bee seen with giant cell arteritis ( temporal arteritis) and polymyalgia rheumatica. Probably a good idea to see doc to eliminate the possibility.

Gum or occlusion: You either have periodontal disease or malocclusion which leads to muscular disturbance (muscle imbalance). Schedule with your dentist to make proper diagnosis, treat you gum disease, or correct your occlusion.

See DDS: the problem could be dental or TMD. see a dentist for diagnosis and treatment options.

Many causes: Could be dental, TMJ, muscle, gum disease. Best plan to see dentist to localize problem. Then get treatment.