Hello...I understand your concern.
Usually as a physician I take a lot of medical history before pointing out towards a diagnosis, but I am glad that you have given all possible necessary information please.
By what you say I feel that this is temporomandibular joint disorder.
Lock jaw is used for tetanus and we don't see this serious bacterial infection now a days.
Temporomandibular joint disorders are problems with the jaw joint and the muscles around it. The jaw joint, called the "temporomandibular joint," is located in front of the ear where the jawbone connects to your head. To feel the joint, place your finger on your cheek just in front of your ear and then open and close your mouth.
TMJ disorders can be caused by many problems, including arthritis. Sometimes TMJ is due to a combination of stress, jaw clenching, teeth grinding, and other things that strain the jaw joint and the muscles around it. Some people with TMJ also have anxiety, depression, or an increased awareness of pain.
The main symptom of TMJ is a dull pain on just 1 side of the face, near the ear. Sometimes the pain also affects the ear, jaw, or back of the neck. Some people have headaches with TMJ. The pain of TMJ is typically constant, but may come and go. It is usually worse with jaw movement. People with TMJ might hear a clicking or popping sound or have a "crunchy feeling" in the joint when they open and close their mouth.
Your doctor might order a special X-ray called a "panoramic radiography of the jaw." This can show the TMJ shape and bone structure, the teeth, and the sinuses. (Your sinuses are hollow areas in the bones of your face.) This test can look for other things that can cause jaw pain.
No single treatment for TMJ works for everyone. Most of the time, medicines and simple lifestyle changes can help. Most patients get better over time, even without treatment, so patience is important.
Treatment options include -
1. Self care and understanding of disorder.
2. Pain killer medications like NSAIDs.
3. Devices – These are called "bite plates" or "occlusal splints." They fit in your mouth and keep you from grinding your teeth at night.
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