Introduction The human immune system is a complex network of cells, tissues, and organs that work in concert to defend the body against infections and diseases. One critical component of this system is lymphocytes, a type of white blood cell vital for immune responses. Lymphopenia, or lymphocytopenia, is a condition characterized by an abnormally low level of lymphocytes in the blood. This condition can be a marker of a weakened immune system, making the body more susceptible to infections and diseases. Understanding lymphopenia is essential for early diagnosis and effective management of the underlying causes.   What is Lymphopenia? Lymphopenia…