Hypothyroidism and depression: what to know

Lower thyroid activity may be associated with tiredness, sleepiness, feeling cold, constipation, a hoarse voice, dry skin and difficulty concentrating as well as low mood. These features can resemble depression, and a person can have both conditions. The presence of fatigue or sadness does not by itself show that the thyroid is responsible.

A clinician will consider how symptoms started, their effect on daily life, sleep and appetite, and whether there are physical signs of thyroid imbalance. Thyroid blood tests can help assess the thyroid, while a mental health assessment explores mood, interest, thoughts and safety.

Book an appointment if low mood lasts, affects work or relationships, or appears with physical changes such as constipation, cold intolerance or daytime sleepiness. Keep taking prescribed thyroid treatment as directed and do not stop it because mood feels low. Write down symptoms, sleep, medicines and recent changes. Support from a trusted person, regular meals, gentle activity and a consistent sleep routine can help while you arrange care, but they do not replace assessment.

Get urgent help if you may harm yourself, cannot stay safe, or feel detached from reality. Contact a clinician promptly for rapidly worsening mood, inability to manage basic care, or extreme sleepiness with confusion. If symptoms are milder but persistent, arrange a routine review so thyroid and mental health needs are considered together.

Ask whether thyroid testing or a treatment review is needed, how your mood will be assessed, and whether counselling or another treatment could help. Tell the clinician about sleep, concentration, appetite, energy, medicines and any thoughts of self-harm, even if they feel difficult to mention.