Thigh root pain in children is not necessarily leukemia. Thigh root pain is a non-specific symptom, lymphadenitis, thigh root carbuncle or boil, inguinal hernia, muscle strain, shingles and many other diseases may lead to the symptoms of thigh root pain. These causes of thigh pain are often accompanied by other accompanying symptoms, for example, lymphadenitis patients may have lymph nodes at the base of the thigh enlarged, hard, tenderness and other manifestations. Carbuncles or boils may be accompanied by red, swollen and painful skin, as well as fever and other accompanying symptoms. The common manifestations of leukemia include unexplained fever, skin petechiae and ecchymosis, or oral mucosal hemorrhages, blood blisters, etc. There may also be dizziness, fatigue and other symptoms of anemia, and some patients may have the manifestation of bone distension and pain, but most of the patients manifested lower limb bone distension and pain, and it is rare to see the pain at the root of the thigh. It is recommended that patients go to the hospital in a timely manner to improve the relevant examination to clarify the specific causes of the disease, and then for the cause of the treatment.