Hot ears can be caused by high ambient temperature, emotional stress, trauma, auricular cartilage inflammation, allergies, etc. 1. High ambient temperature and fever, resulting in a corresponding rise in body surface temperature, and thus hot ears. 2. Emotional excitement of the sympathetic nerves, ear capillary dilation, so the ears will be hot. 3. Trauma: after the ear is violently squeezed, pulled and other traumatic injuries, resulting in local skin damage or subcutaneous hematoma formation, so the ear will be hot. 4. Auricular chondritis:The early stage of infection is characterized by local burning sensation, redness, swelling and pain, followed by diffuse enlargement of the whole auricle, increased pain and increased body temperature. 5. Allergy:The contact of the ear with hair, dust, seafood, pollen and other allergens induces an allergic reaction, localized rash, edema and fever. Ear fever may be related to a variety of factors, it is recommended to consult a doctor to clarify the diagnosis and treatment.