Low antibodies are not a B-cell problem, because B-cells do not produce antibodies; it is the plasma cells (effector B-cells) that produce antibodies.
The main causes of low antibodies are physiological and may be due to malnutrition. If low antibodies are present in childhood and are not treated accordingly. Low antibodies can also occur in adulthood, such as the lack of nutrition can also lead to low antibodies, you can appropriate intake of high-quality protein.
Take Hepatitis B as an example, when a person is injected with Hepatitis B vaccine, after the human body recognizes the HBsAg carried by the Hepatitis B vaccine, the B lymphocytes in the body will be activated, transformed and differentiated into plasma cells (i.e., effector B cells), and the plasma cells will produce antibodies that are specifically directed against the Hepatitis B surface antigens, i.e., the Hepatitis B surface antibodies.
Therefore, antibodies are secreted by plasma cells (effector B cells) and can be used by the immune system to identify and neutralize foreign substances, so antibodies are not produced by B cells, which also indicates that low antibodies are not a problem of B cells.
Low antibodies may lead to low immunity, so it is important to take appropriate treatment in time, such as vaccination.