What is an immune system deficiency?
A person with an immune system deficiency has a weakened immune system, which normally fights infection. Those who have a weak immune system are unable to fight infections appropriately. Common causes of immune system deficiency include diabetes, AIDS, and cancer.

What are the symptoms of an immune system deficiency?
Symptoms of immune system deficiency may include body aches, diarrhea, fatigue, rash, runny nose, sore throat, and lymph gland swelling.

How does the doctor treat an immune system deficiency?
Treatment for immune system deficiency depends on the underlying cause. In those with an HIV infection or AIDS, treatment includes antiviral medications.