Chiropractic care and fever reductions: How does chiropractic care work with patients who have a fever? Chiropractic care helps the nervous system perform better. The nervous system is responsible for regulating and controlling every function of the body, including fever response. Typically, a patient will present to the chiropractor with a fever and receive a spinal adjustment (not to treat the fever, chiropractors do not treat illness). Post spinal adjustment the fever usually increases a degree for an hour or so and then the fever reduces to a lower level. The reason being is that the nervous system’s autonomic control becomes fine-tuned and is more efficient. The increase in immune system function provided by the improved neural impulses helps your body to fight off the infection.