Symptoms of high urea nitrogen need to be analyzed according to the relevant causes. Physiological causes generally do not cause discomfort; pathological causes may include dizziness, headache, nausea, vomiting and other symptoms. 1. Physiological factors: for example, excessive consumption of protein-rich foods can also cause high urea nitrogen, which generally does not cause discomfort. 2. Pathological factors: If the disease belongs to the urinary system and kidney disease, there may be dizziness, headache and other neurological symptoms; nausea, vomiting and other symptoms of the gastrointestinal tract; in addition, there may also be fatigue, loss of appetite and other symptoms. It is recommended that patients with high urea nitrogen consult the hospital in a timely manner, under the guidance of the doctor to improve the relevant examinations, such as pathological factors, should be actively treated to avoid the development of the disease.