What does a chiropractor do?  Chiropractic is a complementary and alternative medicine health care profession concerned with the diagnosis, treatment and prevention of disorders of the neuromusculoskeletal system and the effects of these disorders on general health.
http://en.wikipedia.org/wiki/Chiropractor

What does Chiropractic mean?   Chiropractic is a form of alternative medicine historically based on the idea that misalignment of the spine can cause a wide range of diseases.The main chiropractic treatment technique involves manual therapy, primarily manipulation of the spine.
http://en.wikipedia.org/wiki/Chiropractic

What is spinal manipulation?  Spinal manipulation is a therapeutic intervention performed on synovial joints in the spinal column.
http://en.wikipedia.org/wiki/Spinal_manipulation

What is soft tissue?  In anatomy, the term soft tissue refers to tissues that connect, support, or surround other structures and organs of the body, not being bone. Soft tissue includes tendons, ligaments, fascia, skin, fibrous tissues, fat, synovial membranes (which are connective tissue), muscles, nerves and blood vessels
http://en.wikipedia.org/wiki/Soft_tissue

What is connective tissue?  Connective tissue (CT) is a kind of biological tissue that supports, connects or separates different types of tissues and organs of
the body  
http://en.wikipedia.org/wiki/Connective_tissue

What are tendons?  A tendon (or sinew) is a tough band of fibrous connective tissue that usually connects muscle to bone and is capable of withstanding tension
http://en.wikipedia.org/wiki/Tendon

What are nerves?  A nerve  is an enclosed, cable-like bundle of axons (the long, slender projections of neurons) in the peripheral nervous system. A nerve provides a common pathway for the electrochemical nerve impulses that are transmitted along each of the axons to peripheral organs.
http://en.wikipedia.org/wiki/Nerves

What is neck pain? 
Neck pain, although felt in the neck, can be caused by numerous other spinal problems. Neck pain may arise due to muscular tightness in both the neck and upper back, or pinching of the nerves emanating from the cervical vertebrae. Joint disruption in the neck creates pain, as does joint disruption in the upper back.
http://en.wikipedia.org/wiki/Neck_pain

What causes headaches? 
A headache is pain anywhere in the region of the head or neck. It can be a symptom of a number of different conditions of the head and neck.
http://en.wikipedia.org/wiki/Headache