The symptoms of an underactive thyroid develops gradually, with additional symptoms including:
- Being sensitive to the cold
- Dry skin and hair
- Muscle aches
A thyroid function test (i.e. a blood test) is the only way to measure your hormone levels.
Treatment involves taking daily replacement tablets, called levothyroxine, to raise your thyroxine levels.
Left untreated, an underactive thyroid can lead to heart disease, pregnancy issues, and a life-threatening condition called myxoedema coma.