Sun tendon pain while eating may be caused by the following reasons: 1. Excessive fatigue of the occlusal muscles results. This condition is often seen in patients who often chew harder foods and often use the same side of the teeth for chewing. In addition, if the patient has been mentally tense for a long time and continues to bite, then it may also lead to this condition. 2. This condition is most likely due to neuropathy of the head and face. If the patient has migraine or trigeminal neuralgia, then this pain may also be triggered during eating. 3. This condition may be caused by surrounding inflammation or infection. If the patient has temporomandibular arthritis on one side or periodontitis or infection on one side, the pain may be triggered when eating. 4. This condition may also be caused by cold. If one side of the face or temporal area is cold or wind-blown, then pain may be triggered during meals.