Reduced Libido
A reduced sex drive is common and has many causes, but thyroid disease can contribute — directly through hormone effects and indirectly through fatigue, low mood, weight change and relationship strain.
Both an underactive and an overactive thyroid have been associated with reduced libido.
Last medically reviewed: 15 November 2025
Key points
- Both hypothyroidism and hyperthyroidism can reduce sex drive.
- Fatigue, low mood and sleep problems often contribute.
- Thyroid treatment may improve libido, but other causes should be addressed too.
- Persistent problems warrant a broader assessment.
How the thyroid affects libido
Thyroid hormone influences sex hormone binding globulin, prolactin and the balance of oestrogen and testosterone. In hypothyroidism, prolactin can rise and sex hormone balance can shift; in hyperthyroidism, similar disruptions occur.
The effect on energy, mood and body image is often just as important as the hormonal one.
Other contributors
Stress, relationship difficulties, sleep deprivation, depression, anxiety, medication and other illnesses all affect libido. These should not be overlooked when thyroid tests are normal.
In menopause and ageing, hormonal changes also play a major role.
What to do
If reduced libido accompanies fatigue, weight change, temperature intolerance, mood changes or menstrual irregularity, thyroid testing is reasonable.
Correcting thyroid dysfunction may help, but improvement can take months and may require addressing other factors.
Talking about it
Sexual concerns are common and treatable. Raising them with a clinician — and, where appropriate, with a partner — is the first step. There is no need to accept persistent problems silently.
When to seek urgent medical help
- Chest pain or palpitations during sexual activity.
- Sudden loss of libido with severe fatigue or weight loss.
- Symptoms of depression, including loss of interest in most activities.
This guidance does not replace emergency services. If you are seriously unwell, seek urgent medical care immediately.
Frequently asked questions
Can thyroid disease lower sex drive?
Yes — both an underactive and overactive thyroid can reduce libido, directly and through fatigue, mood and body changes.
Will treatment improve it?
It can, but improvement may take months and other factors such as stress, sleep and mood also need attention.
Is it related to fertility?
Thyroid disease can affect both libido and fertility, so persistent difficulties should be assessed.
Should I have my hormones checked?
Thyroid testing is a reasonable start. Depending on the picture, other hormone tests may be arranged.
References & further reading
This page is based on established medical knowledge and guidelines from authoritative sources. Always consult a qualified clinician for personal medical advice.
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