Goitre contributing factor. In countries that use iodized salt, Hashimoto's thyroiditis is the most common cause. Goitre can also result from cyanide poisoning; this is particularly common in tropical countries where people eat the cyanide-rich cassava root as the staple food. Goitre is treated according to the cause. If the thyroid gland is producing an excess of thyroid hormones (T3 and T4), radioactive iodine is given to the patient to shrink the gland. If goitre is caused by iodine deficiency, small doses of iodide in the form of Lugol's iodine or KI solution are given. If the goitre is associated with
Complement deficiency Complement deficiency Complement deficiency is an immunodeficiency of absent or suboptimal functioning of one of the complement system proteins. Because there are redundancies in the immune system, many complement disorders are never diagnosed, some studies estimated that less than 10% are identified. "Hypocomplementemia" may be used more generally to refer to decreased complement levels while "secondary complement disorder" means decreased complement levels that are not directly due to a genetic cause but secondary to another medical condition. The following symptoms (signs) are consistent with complement deficiency in general: Vaccinations for encapsulated organisms (e.g., "Neisseria meningitidis" and "Streptococcus pneumoniae") is crucial