What are the symtoms of thyroid disorders?

Depends on Disorder: An overactive thyroid may make you feel like you just drank a pot of coffee: jittery, anxious, rapid/irregular heart beat, headache, insomnia, more frequent trips to the bathroom, weight loss, weak. Underactive thyroid may feel like you're tired all the time, constipated, dry skin/hair, maybe a little weight gain. There may be other symptoms but these are the most common.

Symptoms: Hyperthyroidism leads to tachycardia ie fast heart rate, palpitations, weight loss, anxiety, insomnia, tremors. Hypothyroidism leads to dry skin, coarse hair and hair loss, constipation, fatigue, weight gain, forgetfulness, depression, mood swings and irregular periods.