The cause of neutropenia varies from cause to cause. Simple neutropenia can be asymptomatic, or it can present with fever, malaise, headache, dizziness, sore throat, cough, muscle aches, herpes, anemia, bleeding, and other symptoms. Low neutrophils may not have any symptoms, if combined with viral infection or bacterial infection may appear uncomfortable symptoms, such as: 1. Viral infections: for example, headache, sore throat, runny nose, cough and other symptoms of cold; influenza virus infection may have fever, fatigue, muscle aches and other symptoms; chickenpox virus infection may have fever, fatigue, pimples on the head, face and trunk, itching and other symptoms. 2. Bacterial infection: such as pertussis bacillus can have fever, cough and other symptoms; dysentery bacillus can have high fever, malaise, abdominal pain, diarrhea and other symptoms; meningitis bacillus can have fever, irritability, headache, vomiting and other symptoms. Blood disorders such as aplastic anemia can also present with low neutrophils, and may have symptoms such as anemia, bleeding, and infection. Autoimmune diseases can also have low neutrophils, which can be accompanied by systemic multi-organ damage and symptoms such as fatigue, fever, anemia and proteinuria. It is recommended to go to the hospital in time when the above symptoms appear, and identify the cause of the disease and then targeted treatment.