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.
Symptoms of acute vitamin A toxicity include: drowsiness; irritability; abdominal pain; nausea; vomiting; increased pressure on the brain; Symptoms of chronic vitamin A toxicity include: blurry vision or other vision changes; swelling of the bones; bone pain; poor appetite; dizziness; nausea and vomiting; sensitivity to sunlight; dry, rough skin; itchy or peeling skin