Regardless of where a problem may originate in the body, the neck and shoulders are very often the manifestation of the issue. This is true of both physical and emotional dysfunctions.
On top of the cervical vertebrae is a large roundish object which is virtually always in motion in an attempt to stay balanced and to keep the eyes horizontal. If this object, also known as the head, is well balanced on the vertebrae then the loads on the muscles of the neck and shoulders are relatively low. However, physical disturbances all down the body to the feet can interfere with this dynamic leading to greater loads on and tension in the muscles. For example, a shortening of calf muscles from, say, wearing high heels, tilts the pelvis forward which alters the curvature of the spine which will impact on how the head sits.
In addition, our necks are always adjusting to any imbalances in our body. If we sidebend to one side then there is a tendency for our neck to counteract this movement in order to keep our eyes level with the ground.
Chickens are often used to demonstrate this to great effect!
Our emotions often arise in our stomachs and we are all familiar with the sensation of butterflies or tightening in our bellies. From there they will wind up again to our necks where the emotions can often be expressed in the form of tightening of the muscles of the neck and shoulders. If this becomes a near constant state of tension then we can lose a degree of flexibility in our spine to create a bottleneck in the area.
For these reasons, whenever you book in for a massage, then your therapist is likely to find restrictions and painful areas in your neck that you may not even have been aware of. However, if you do present with a neck problem then it may very well be the case that your therapist could spend significant time working on parts of the body other than the neck if they consider that the root cause of the neck issues may not actually be with the neck.