How common is low mood in hypothyroidism?

The thyroid helps regulate processes that affect energy and body function. When thyroid hormone levels are low, some people notice reduced energy, slower thinking, low motivation, and a downcast mood. Symptoms often develop gradually, which can make the change easy to overlook.

Low mood is not specific to thyroid disease. A clinician may ask about symptoms, medical history, medicines, menstrual or reproductive changes when relevant, and family history. Blood tests can help assess thyroid function, while the full picture helps distinguish thyroid-related symptoms from depression, sleep problems, stress, or other health issues.

Arrange an appointment if low mood occurs with persistent tiredness, cold intolerance, constipation, dry skin, hair changes, or slowed thinking. Bring a list of symptoms, medicines, supplements, and when each change began. Do not start thyroid medicine or alter an existing dose without medical guidance.

While waiting for assessment, keep regular meals and sleep times, pace demanding tasks, and tell someone you trust how you are feeling. If hypothyroidism is diagnosed, follow-up helps check whether treatment is controlling symptoms and whether low mood needs additional support.

Seek medical advice when symptoms are persistent, worsening, or interfering with work, relationships, or self-care. Get urgent help for suicidal thoughts, self-harm urges, severe confusion, extreme drowsiness, or an inability to stay safe; contact local emergency services or attend the nearest emergency department.

Ask: Could thyroid problems contribute to my mood? Which tests are appropriate? Could another condition or medicine be involved? If treatment is started, when should symptoms be reviewed? What help is available for low mood itself?