Humidity, contact with moisture, and stamps sticking to old album pages and then removed are common examples of disturbed gum. Once again, the amount of original gum left (most refer to +/- 50% of the original gum) on the stamp is a distinction that's made amongst some dealers and collectors.
Description of sciatica. Sciatica describes a collection of symptoms that can arise with sciatic nerve compression. This nerve is the largest and longest in the body, running from the base of the spine and down through both legs. Sciatic nerve compression can lead to pain that begins in the lower back and moves through the buttocks, legs and feet.
The cervical spine is the upper part of your spine that supports your neck. The cervical spine has seven vertebrae. The middle part of your back is your thoracic spine. It is made up of 12 vertebrae. The lumbar spine is your lower back and has five vertebrae. Spinal compression can occur in any of these areas.