According to this theory, a pathogenic organism that rapidly mutates and hides is responsible. The body does enormous collateral damage trying to destroy the organism but ends up doing more damage to the body than to the organism. The immune system is complicated. All these components work together as a team. When one part of the team fails to do its job, the entire system is rendered ineffective.
Conventional medicine has three major approaches to immune dysfunction.
This will have the natural effect of depressing the immune system further. Unfortunately, these also have serious side-effects and further weaken the immune system. Though they may initally relieve symptoms they always lead to worse complications eventually. It is truly amazing how much of medicine revolves around immune suppressants. The methods of modern medicine have been surprisingly crude but lately genetic engineering through sophisticated recombinant techniques have managed to duplicate parts of the immune system.