Lip burning can originate from nerve damage, exposure to cold temperatures, dry skin, chemical burns, sunburn, lip injury, thermal burns, diabetes and stroke, according to Healthgrades. Lip burning accompanied by severe headaches, difficulty speaking, muscle weakness or vision changes constitutes a medical emergency and must be treated immediately.
Lip burning may indicate that a person is suffering from a serious underlying health condition, such as cranial nerve trauma or transient ischemic attack, explains Healthgrades. Untreated lip burning may result in further health complications, including limb amputation, low blood pressure, permanent nerve damage and infection. Doctors are able to assess a patient's full range of symptoms and make a diagnosis that corresponds to an effective treatment plan.