I'm no expert on this but it may be a vitamin b12 deficiency. Vitamin b12 is absorbed in the small intestines and needs gut bacteria to be properly absorbed. I can vaguely remember reading this so don't take my word for it but you can definitely know what the symptoms are from:
http://www.health.harvard.edu/blog/vitamin-b12-deficiency-can-be-sneaky-harmful-201301105780
If deficient for a long time you can start to get nerve issues in limbs. Like I said I know very little about this but its better for me to say something than nothing at all. I got this on CCFA website for you:
Again, that depends on the extent and location of the disease. Vitamin B-12 is absorbed in the lower ileum—that means that people who have ileitis (Crohn's disease that affects the ileum) or those who have undergone small bowel surgery may have a vitamin B-12 deficiency because they are unable to absorb enough of this vitamin from their diet or from oral supplements. To correct this deficiency—which can be determined by measuring the amount of this vitamin in the blood—a monthly intramuscular injection of vitamin B-12 may be required.
Folic acid (another B vitamin) deficiency is also quite common in patients who are on the drug sulfasalazine. For these patients, the recommended dietary allowance for a folate tablet is 1 mg daily, as a supplement. For most people with chronic IBD, it is worthwhile to take a multivitamin preparation regularly. If you suffer from maldigestion or have undergone intestinal surgery, other vitamins-particularly vitamin D-may be required. Affecting as many as 68 percent of people, vitamin D deficiency is one of the most common nutritional deficiencies seen in association with Crohn's disease. Vitamin D is essential for good bone formation and for the metabolism of calcium.
http://www.health.harvard.edu/blog/vitamin-b12-deficiency-can-be-sneaky-harmful-201301105780
If deficient for a long time you can start to get nerve issues in limbs. Like I said I know very little about this but its better for me to say something than nothing at all. I got this on CCFA website for you:
Again, that depends on the extent and location of the disease. Vitamin B-12 is absorbed in the lower ileum—that means that people who have ileitis (Crohn's disease that affects the ileum) or those who have undergone small bowel surgery may have a vitamin B-12 deficiency because they are unable to absorb enough of this vitamin from their diet or from oral supplements. To correct this deficiency—which can be determined by measuring the amount of this vitamin in the blood—a monthly intramuscular injection of vitamin B-12 may be required.
Folic acid (another B vitamin) deficiency is also quite common in patients who are on the drug sulfasalazine. For these patients, the recommended dietary allowance for a folate tablet is 1 mg daily, as a supplement. For most people with chronic IBD, it is worthwhile to take a multivitamin preparation regularly. If you suffer from maldigestion or have undergone intestinal surgery, other vitamins-particularly vitamin D-may be required. Affecting as many as 68 percent of people, vitamin D deficiency is one of the most common nutritional deficiencies seen in association with Crohn's disease. Vitamin D is essential for good bone formation and for the metabolism of calcium.
