The pain in the left jaw when pressed may be caused by the following: 1. Local soft tissue contusion caused by trauma, which usually has a clear history of trauma, such as being hit by someone, or caused by a local bump, usually in addition to pain, there will be local swelling, or the formation of subcutaneous petechiae. 2. Local aseptic inflammation, which may be caused by sleeping When accidentally pressed for a long time, resulting in ischemia and caused by sterile inflammation, this condition can disappear naturally. If there is local redness, swelling, heat and pain, you can take oral anti-inflammatory drugs to relieve pain. 3, it may be the formation of swollen lymph nodes in the lower jaw, this condition will be felt when pressing or touching the lower jaw, there will be granular hard nodes, and pain when pressing, the most common is caused by acute pharyngitis, acute tonsillitis.