My left lower jaw has been in pain lately. when i open my mouth all the way it hurts. what could it be? it's been happening for a few days.

TMJ: TMJ symptoms are most often temporary and not a signal of serious problems.Conservative treatment in most cases resolves the symptoms. Try a soft diet, ice packs (warm moist heat if that makes it feel better), and avoid extreme jaw movements such as wide yawning and gum chewing. Also consider over the counter pain medicines such as ibuprofen .