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What is All are seen in hypothyroidism except - and explain in detail?
Diarrhea is a feature of hyperthyroidism.
Hypothyroidism

Iodine deficiency is the most common cause of hypothyroidism
In area of iodine sufficiency, autoimmune thyroiditis (Hashimoto's disease) is the most common cause.

Clinical features of hypothyroidism

Weight gain, poor appetite                     
Cold intolerance, cool peripheral extremities.
Bradycardia, ↑ Diastolic BP                 
increased cholesterol, phospholips, triglyceride → Arteriosclerosis.