Gluten Intolerance is the misery that accompanies an immune system reaction to gluten from wheat, barley, rye, and oats when consumed by susceptible individuals. The effects can be wide ranging, and are apparently behind the triggering of numerous "autoimmune disorders".
Many medical practitioners know about the existence of autoimmune disorders. Many have known about them for decades. Very few understand that there is a linkage between autoimmune disorders and dietary wheat gluten.
When a susceptible indivual consumes gluten over many decades of life, different autoimmune disorders pop up from time to time. Unfortunately once you "get" an autoimmune disorder, you seem to have it for life.
Examples of autoimmune disorders include Hashimoto's Thyroiditis, Seborrheic Dermatitis, Vitiligo, Dermatitis Herpetiformis, Type I Diabetes, Rheumatic Fever - - - but the list goes on for over eighty different recognized disorders, with another list of suspects.
Celiac Disease is caused by the same type of immune response as Gluten Intolerance, although it has, as a target, tissues in the small intestine. Human physiological responses to ingesting gluten vary widely among individuals, and even change and evolve over time in each individual.
While Celiac Disease includes flattened villi in the mucosa of the first section of the small intestine, there are many other effects that a person who has Celiac Disease will experience beyond that. There is such a broad spectrum of trouble that there is little to be gained by making a distinction between the two. If you have Celiac Disease, you are Gluten Intolerant; if you are Gluten Intolerant, but have no symptoms of Celiac Disease you may yet develop Celiac Disease.
Anybody who has one autoimmune disorder has a very high likelihood of developing another autoimmune disorder. They may come at wide time intervals - perhaps years apart. They may attack mildly or viciously. It varies widely from person to person.
For all practical puroses, Celiac Disease is but one of many manifestations of Gluten Intolerance.