hi .my name is omar  i am 20 years old my height is 176 cm and my weight is 74 kilograms . i have a problem with my lower jow i feel like it is crackling in many times during eating or yawning .somtimes i feel like it is not fit in its place when i sleep on any side of my face or even when i am just sitting doing nothing . i have this problem for about 6 years . i have no other medical problems except for being nervy that somtimes causes an increase in blood pressure .
Reading your query it seems u might be suffering from Temporomandibular disorders (TMD). The cause of TMD is not clear, but symptoms arise from problems with the muscles of the jaw or with the parts of the joint itself. Injury to the jaw, temporomandibular joint, or muscles of the head and neck -- such as from a heavy blow can cause TMD. As u suggested of being nervy that is being stressed u might be grinding or clenching the teeth, which puts a lot of pressure on the TMJ and can cause dislocation of the soft cushion or disc between the ball and socket also the Presence of osteoarthritis or rheumatoid arthritis in the TMJ can cause a person to tighten facial and jaw muscles or clench the teeth. As there are many reasons to get a TMD problem u need to get it checked clinically, radiographically and blood testing to cum to any diagnosis.... visit your dentist soon Regards Chat Doctor.