While chiropractors are thought of mainly for back problems or to heal injuries, chiropractic can also help to relieve sinus pain and allergies. Very commonly a fixation in the upper cervical spine is related to sinus and allergy problems. Joint manipulation can help to improve sinus problems because the treatment decrease pain and improve sinus drainage. Allergies can also be alleviated through the use of chiropractic because it allows the immune system to function more efficiently. A nervous system with less stress contributes to the overall efficiency of the system as well. Stress on the nervous system may prevent it from operating at its best; therefore, it cannot deal with outside conditions affecting the body. When the nervous system functions properly, it can aid the immune system.