One of the primary causes of jaw discomfort is temporomandibular joint disorder. Commonly referred to as TMJ or TMD, this issue occurs when the temporomandibular joint between your skull and your jaw effectively malfunctions. This is considered a hinging joint, and when you're experiencing TMJ, your jaw is unable to slide the hinge properly into and out of place when you do things such as chewing (via the Mayo Clinic). In addition to your jaw locking, TMJ causes general pain and discomfort, headaches, and it disrupts your ability to control your jaw with ease, per Mayo Clinic.

According to WebMD, TMJ is most common in individuals between the ages of 20 and 40, and women are more susceptible than men. In severe cases, TMJ leads to tinnitus, or a ringing in your ears, if left untreated. Schedule an appointment with your dentist if you think you have TMJ, as this disorder requires a formal diagnosis. Your dentist will then work with you to determine the best ways to treat your TMJ, as some solutions are more effective than others depending on the severity of your case.

TMJ pain and jaw locking can be lessened through the use of ibuprofen, heating pads, and a splint or nightguard to protect your teeth and jaw while you're sleeping, per WebMD.