Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern..
As per your complain it seems that if the swelling in jaw can be possibly due to grinding of teeth but some other causes can be a :
1. A
dental abscess in which there is pus formation below the root tips of a deeply infected tooth leading to pain and swelling as well as pain and swelling can increase on lying down due to increase in blood flow on upper body and face which can increase the hydrostatic pressure..
2. Other reason can be some pathology related to the Submandibular
Salivary Gland on that side which is one of the major salivary gland..
I would advise you to get a full mouth x ray that is an
Orthopantomogram [OPG] done.
Also MRI of the salivary gland has to be done..
Complete blood count [CBC]..
All this has to be done under advise of an ORAL PATHOLOGIST and proper treatment can be planned according to the diagnosis..
As of now you can take anti inflammatory painkiller like
Ibuprofen to relieve pain.
Do cool compresses over the swelling..
Hope this information helps..
Thanks and regards..
Dr.Honey Nandwani Arora..