Autimmunity and allergic diseases
The immune system usually defends us against bacteria, parasites and viruses, and can tell the difference between foreign bodies and our own cells. Immune disorders are diseases that occur when the immune system accidently attacks the wrong target. This can cause autoimmune diseases where the immune system attacks the body’s healthy tissues such as the skin, joints or nerve cells. In some diseases, such as type 1 diabetes the body only attacks the one organ - the pancreas, and in others, such as Lupus, the body can attack multiple sites in the body.
Immune disorders also includes allergic diseases, where the immune system attacks harmless environmental particles such as pollen or food particles like peanuts leading to allergies.