Symptoms of an underactive thyroid may be mild and may not be easy to notice.

Common symptoms include:

• feeling extremely tired (fatigue)
• feeling cold more than usual
• putting on weight
• constipation
• difficulty concentrating or thinking clearly
• low mood or depression
• dry skin, dry hair or hair loss
• a croaky (hoarse) voice
• irregular or heavy periods if you have them

Symptoms usually develop slowly and get worse over time.

See a GP if:

• you think you might have an underactive thyroid

Some of the symptoms are common and can be caused by other conditions. But it's important to get them checked by a GP.