>>26329An underactive thyroid (hypothyroidism) is a common condition where the thyroid gland in your neck does not make enough hormones. This can cause symptoms like tiredness and weight gain. It can be managed with treatment.
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