Swollen lymph nodes cannot be detected by routine blood tests. Lymph nodes are immune organs and can be determined by palpation and imaging tests to determine whether they are enlarged as follows: 1. Palpation: if lymph nodes are palpated, it means that they are enlarged, but under normal circumstances they will not be palpated; 2. Imaging tests: including ultrasound, CT, etc. If the size of lymph nodes is found to exceed the normal range, it means that they are enlarged. After the swelling of lymph nodes must pay attention to, need to improve the relevant examination, such as blood routine and so on, if the condition requires can also perform lymph node biopsy, can clarify the cause, and then can be for the cause of treatment, patients should not blindly take medicine, or may delay the diagnosis and treatment of the disease.