Slightly low neutrophils usually do not have noticeable symptoms, whereas a significant decrease in neutrophils caused by hematologic disorders such as aplastic anemia can lead to symptoms such as bleeding and anemia in the body. Neutrophils are a very important type of white blood cells that contain bactericidal substances such as lysosomes, which play a key role in controlling early infections. When the body’s neutrophils decrease, the body’s ability to fight infection decreases. 1. If the decrease is only mild, there are usually no obvious symptoms because the body has a certain compensatory function. 2. And if it is caused by blood system diseases, such as aplastic anemia causing a significant decrease in neutrophils, there will be a very high risk of serious infections due to the decrease in the body’s white blood cells, red blood cells as well as platelets, as well as bleeding of the superficial skin and mucous membranes, whitening of the mucous membranes, and so on. If the neutrophil is low, it is recommended to go to the hospital as soon as possible to clarify the diagnosis, and standardize the treatment under the guidance of the doctor.