I have pain on left jaw when pressed few metres above jaw joint.it might be a little bit swollen.i had foul taste 2 days ago nd mucus in mouth.pain radiate towards teeth.what can be possible causes?

You may have a dental infection. Please have a dentist take a look.

You probably have an infection in your tooth or gum disease or both. The symptoms are all associated with both problems. See a dentist now for treatment, don't try to fix it yourself.

Most common cause is infection of teeth, gums/bone, or both. Other causes, though relatively rare, are possible. See your Dentist for examination, differential diagnosis, and treatment.