Hi.. Thanks for the query.. Pain in lower jaw can occur due to a number of causes like tooth infection, gum infection, inflamed salivary gland under the jaw, jaw joint dysfunction, teeth clenching habit, ear infection etc.. I would suggest you to consult an Oral Physician and get evaluated and he can do a clinical evaluation of the inside of mouth that is oral cavity as well as structures surrounding the jaw along with jaw joint and advise you investigations like full mouth x ray or Orthopantomogram and treat you according to the cause as treatment may vary as per cause.. As of now you can take Acetaminophen or Advil to relieve pain.. Take a soft diet and avoid excess mouth opening.. Avoid stress and do meditation and breathing exercises.. Hope this helps.. Regards..