Symptoms of horseshoe kidney usually include lower back pain, lower abdominal mass, frequent urination and so on. It is harmful to lead to hydronephrosis, urinary system diseases and so on. 1. Symptoms of horseshoe kidney (1) Lumbar pain: generally manifested as pain in the lower back and umbilicus, which is intermittent. (2) Lower abdominal mass: patients with horseshoe kidney suffer from hydronephrosis due to the compression of ureter, resulting in lower abdominal mass. (3) Frequent urination: patients with horseshoe kidney usually cause urinary system diseases, so they will have the symptom of frequent urination, accompanied by urinary urgency and painful urination. 2. Harms of horseshoe kidney (1) lead to hydronephrosis: patients with horseshoe kidney are often accompanied by vascular variations, ectopic blood vessels will compress the patient’s ureter, resulting in poor drainage of urine, which is easy to cause hydronephrosis. (2) Lead to urinary system diseases: Normal kidney should be located between the third and fourth lumbar vertebrae, while horseshoe kidney is lower than the normal kidney, usually located in the pelvis and above, and the ureter of horseshoe kidney is shorter than the normal kidney, so it may lead to urinary tract infections, resulting in urinary system diseases. It is recommended that patients with horseshoe kidneys should consult a doctor for relevant examinations in time, and according to the specific situation, under the guidance of the doctor, carry out symptomatic treatment.