Hypothyroidism is harmless.
Hypothyroidism . It can cause a number of symptoms , such as poor ability to tolerate cold , a feeling of tiredness , constipation , depression , and weight gain . Occasionally there may be swelling of the front part of the neck due to goitre . In countries with enough iodine in the diet , the most common cause of hypothyroidism is the autoimmune condition Hashimoto 's thyroiditis .