Vitamin D Deficiency Symptoms Affected by Gastrointestinal Diseases
To avoid some health problems, including gastrointestinal diseases that may be serious, one priority an individual can take is to avoid any vitamin D deficiency symptoms. A simple way to get vitamin D synthesized in your body is to have your skin exposed to vital sunlight for less than half an hour each day. Gastrointestinal diseases are abnormalities of the digestive system causing discomfort while dealing with the bowel system.
The main focus for vitamin D is to ensure each person has an accurate amount of calcium to utilize. It assists with the production of the hormones that secures calcium goes into bones and not into other tissues.  The physician evaluating a patient diagnosed with vitamin D deficiency and osteoporosis needs to contemplate a possibility of a gastrointestinal etiology. On a similar note, when a patient with a gastrointestinal disorder needs his/her doctor check that patient for both bone disease and vitamin D deficiency. 
Absorbing Vitamin D for Use
Symptoms arising from gastrointestinal disease and some kidney and liver conditions can be signals that there is a vitamin D deficiency. Those medical abnormalities could cause vitamin D in the digestive tract from being absorbed. This particular vitamin may also be obstructed from being converted to active form where it can be utilize by the body. Irritable bowel syndrome (IBS) is a gastrointestinal disease. An example of IBS is Crohn’s disease, which involves abdominal pain, persistent diarrhea, or blood in the stool and fever occurring. 
Individuals who are allergic to milk or are lactose intolerant obviously would be void of vitamin D coming from fortified milk. 
Impact of Gastrointestinal Disorders
Gastrointestinal disease may impact calcium and/or vitamin D absorption. To form into active compounds, vitamin D must be metabolized another step after it enters the body. Liver diseases alter the way the first step in bioactivation takes place. Prescription medications such as phenytoin may also affect the first metabolic step and causing deficiency of the active metabolites. Another malabsorption of vitamin D has a requisite of only a tiny intestine, liver, and pancreas to provide the milieu (lipase and bile acids) that is needed for unhindered absorption. What can cause this particular problem are chronic pancreatic insufficiency, disorders of the biliary tract, partial gastrectomy, intrinsic small bowel disease, and surgical bypass procedures of the jejunum and ileum. There are other ways that individuals with vitamin D deficiency symptoms have trouble feeling better because of a gastrointestinal disorder. 
As you probably can tell by now, patients with a possibility or already diagnosed with a gastrointestinal disease have the urgency to resolve it. Winter days will be filled with cloudy days for some people. Therefore, digesting food or pills to avoid vitamin D deficiency symptoms will be a nuisance for individuals who will digest them improperly.