A poor diet that lacks essential nutrients generally causes nutritional deficiencies. The body stores nutrients. Therefore, a deficiency is usually detected after a prolonged lack of a nutrient. A number of diseases and conditionsâincluding colon cancer and gastrointestinal conditionsâcan lead to an iron deficiency.
Iodine is LIKELY SAFE for most people when taken by mouth at recommended amounts or when applied to the skin appropriately using approved products. Iodine can cause significant side effects in some people. Common side effects include nausea and stomach pain, runny nose, headache, metallic taste, and diarrhea.
Some side effects from radioactive iodine treatment include: 1  Metallic taste in your mouth. 2  Dry mouth. 3  Sore throat. 4  Neck pain. 5  Radioactive iodine treatment can make your neck swell up or hurt. 6  Nausea or vomiting, which is usually mild. 7  Constipation or diarrhea. 8  Fatigue.