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Health condition · Clinically reviewed

Hypopituitarism, carefully tested, safely replaced, closely followed.

When the pituitary gland fails, symptoms are quiet and easily missed. Modern UK care starts with a full hormone profile, a dedicated MRI and a specialist plan.

Jump to treatment
A radiographer guides a patient onto the bed of an advanced 3 Tesla MRI scanner in a London imaging suite

Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

    Checked against Society for Endocrinology, Pituitary Foundation and peer-reviewed sources you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK practice including sick-day cortisol rules, checkpoint-inhibitor hypophysitis and pituitary MDT care.

Key facts

Hypopituitarism at a glance.

The essentials, in plain English. What the pituitary does, how it fails, and the axes doctors always check first.

  • What it is

    Deficiency of one or more anterior pituitary hormones, sometimes with posterior pituitary failure and diabetes insipidus.

  • Common causes

    Pituitary tumours, pituitary surgery or radiotherapy, apoplexy, head injury, autoimmune hypophysitis and infiltrative disease.

  • Hormones involved

    ACTH, TSH, LH and FSH, growth hormone, prolactin and antidiuretic hormone can all be affected in any combination.

  • Most urgent axis

    ACTH deficiency causes secondary adrenal insufficiency and needs lifelong hydrocortisone with strict sick-day rules.

  • Investigation

    Full pituitary blood profile, dynamic testing where indicated, dedicated pituitary MRI and formal visual field assessment.

  • MDT care

    Managed by specialist endocrinology teams at UK pituitary centres, often alongside neurosurgery and oncology.

Why this guide matters

A quiet disease, easily missed.

Symptoms are often blamed on ageing, stress or the menopause. A careful hormone workup and a dedicated MRI find what a routine blood test can miss.

  • Cortisol first, always

    Adrenal insufficiency is the axis that can kill. Hydrocortisone is started before thyroid hormone and continues lifelong. See our Addison’s disease guide.

  • A pituitary MRI, not a routine head scan

    A dedicated pituitary MRI is far more sensitive than a standard brain scan for adenomas, apoplexy and empty sella. See our private MRI scan guide.

  • Care belongs in a pituitary centre

    UK pituitary centres such as Barts, King’s, the Royal Free and Sheffield run specialist MDTs. Complex cases are referred there for surgery, radiotherapy and long-term follow-up.

How the diagnosis is made

From vague symptoms to a clear plan.

The steps a UK endocrinologist will normally follow, in order, so you know what to expect and why.

  1. 01

    Assessing

    History and symptom pattern

    A careful review of fatigue, cold intolerance, low libido, weight change, headache and visual symptoms, plus obstetric, trauma and radiation history.

  2. 02

    Assessing

    Medication and treatment review

    Recent opiates, steroids, checkpoint inhibitors and prior pituitary surgery or radiotherapy all shape the differential.

  3. 03

    Assessing

    Examination and visual fields

    Endocrine examination, cranial nerves and bedside visual field testing to look for bitemporal hemianopia from chiasmal compression.

  4. 04

    Confirming

    Full pituitary blood profile

    A 9am cortisol and ACTH, TSH and free T4, LH, FSH and sex hormones, IGF-1 and prolactin as the standard starting panel.

  5. 05

    Confirming

    Dynamic pituitary testing

    Insulin tolerance, glucagon, short synacthen and water deprivation tests confirm axis-specific failure, arranged in a specialist commissioned setting.

  6. 06

    Planning

    Dedicated pituitary MRI

    A specialist commissioned pituitary MRI protocol looks for adenoma, apoplexy, empty sella or infiltrative disease.

  7. 07

    Planning

    MDT plan and long-term follow-up

    Discussed at a pituitary MDT so replacement, surgery, radiotherapy and monitoring are coordinated from the outset.

Typical timeline: a first specialist visit to a settled plan in a few weeks.

Symptoms

What hypopituitarism looks like.

Symptoms are hormone-specific and often insidious. Mass-effect features such as headache and visual loss point to a pituitary tumour.

  • Fatigue and low energy

    Persistent tiredness and reduced stamina from combined cortisol, thyroid and growth hormone deficiency.

  • Cold intolerance and weight change

    Secondary hypothyroidism causes cold sensitivity, dry skin, constipation and gradual weight gain.

  • Low libido and sexual dysfunction

    Secondary hypogonadism reduces libido and can cause erectile dysfunction, amenorrhoea or subfertility.

  • Headache and visual symptoms

    Mass effect from a pituitary tumour may cause frontal or retro-orbital headache and bitemporal visual loss.

  • Postural dizziness and collapse

    Adrenal insufficiency can present with postural hypotension, nausea and, at worst, an adrenal crisis.

  • Thirst and dilute urine

    Central diabetes insipidus causes intense thirst, high urine output and disturbed sleep from nocturia.

  • Loss of body hair and pale skin

    Long-standing panhypopituitarism can cause thin body hair, fine wrinkling and a characteristic pallor.

  • Red flag - apoplexy

    Sudden severe headache, visual loss, ophthalmoplegia and collapse suggest pituitary apoplexy and needs emergency admission.

Treatment

How hypopituitarism is treated in the UK.

Replacement is tailored to each deficient axis. Surgery, radiotherapy and tumour-specific drugs are added when the cause is a pituitary tumour.

  • Hydrocortisone replacement

    Lifelong glucocorticoid replacement in split daily doses with strict sick-day rules, an emergency injection kit and a medic-alert identifier.

  • Levothyroxine

    Thyroid hormone replacement for secondary hypothyroidism, always started after cortisol replacement to avoid precipitating an adrenal crisis.

  • Testosterone replacement

    For men with secondary hypogonadism, tailored gels or injections restore libido, energy, bone density and mood. See our testosterone replacement clinic guide.

  • Oestrogen and progesterone

    For women with secondary hypogonadism, systemic hormone therapy protects bone and cardiovascular health. See our hormone therapies overview.

  • Growth hormone (somatropin)

    Daily somatropin injections in adults and children with confirmed deficiency, prescribed and monitored in a specialist commissioned pituitary service.

  • Desmopressin (DDAVP)

    Oral, sublingual or intranasal desmopressin for central diabetes insipidus, carefully titrated to avoid hyponatraemia.

  • Fertility hormones

    Gonadotrophin injections to restore ovulation or spermatogenesis when pregnancy is planned, delivered by a specialist commissioned reproductive team.

  • Pituitary surgery and radiotherapy

    Transsphenoidal surgery for compressive tumours and selective radiotherapy for residual or recurrent disease, coordinated by neurosurgery.

Tumour-specific and emergency care

Where surgery and targeted drugs fit alongside replacement.

Transsphenoidal surgery removes compressive tumours (see our pituitary tumour surgery guide). Dopamine agonists shrink prolactinomas, and somatostatin analogues control acromegaly. Pituitary apoplexy is a neurosurgical emergency needing high-dose steroids and rapid MRI. Checkpoint-inhibitor hypophysitis is managed alongside our immunotherapy checkpoint clinic.

What this guide is based on

The sources behind every claim on this page.

UK national guidance and specialist society standards, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your endocrinologist knows your history and can tell you which parts apply to you. If you feel unwell on hormone replacement, get seen without delay.

  • Society for Endocrinology. UK guidance on adrenal insufficiency and pituitary disease.

  • Pituitary Foundation. Patient resources on hypopituitarism and pituitary tumours.

  • NICE Clinical Knowledge Summaries. Adrenal insufficiency, hypothyroidism and hypogonadism.

  • British Neurosurgical Society and British Association of Endocrine and Thyroid Surgeons. Pituitary surgery standards.

Red flags

When hypopituitarism needs urgent attention.

Most hypopituitarism is managed steadily in clinic. These are the situations where waiting is not safe.

  • Pituitary apoplexy

    Sudden severe headache, visual loss, double vision, nausea and collapse. A neurosurgical emergency needing urgent MRI and steroid cover.

  • Adrenal crisis

    Vomiting, dehydration, low blood pressure, confusion or drowsiness in a patient on hydrocortisone. Give intramuscular hydrocortisone and call 999.

  • New bitemporal visual loss

    Progressive loss of peripheral vision suggests chiasmal compression from a pituitary mass and needs urgent imaging.

  • Severe hyponatraemia

    Confusion, seizures or reduced consciousness with low sodium can complicate cortisol deficiency, diabetes insipidus or desmopressin over-treatment.

  • Postpartum collapse or failure to lactate

    Suggests Sheehan syndrome from peripartum pituitary infarction and needs urgent endocrine assessment.

  • Head injury with hormonal symptoms

    Post-traumatic hypopituitarism can emerge weeks or months after a moderate or severe head injury. See our intracranial haematoma guide.

  • Checkpoint-inhibitor hypophysitis

    New headache, fatigue or visual symptoms on immunotherapy needs urgent pituitary bloods. See our immunotherapy checkpoint clinic guide.

  • Missed sick-day steroid dose

    Any patient on hydrocortisone with fever, vomiting or major surgery needs doubled or parenteral doses to prevent crisis.

  • Pregnancy on pituitary replacement

    Cortisol, thyroid and desmopressin doses often need adjustment. Early endocrine review is essential.

Living with it

A lifelong condition, but well controlled.

With modern replacement, annual review and clear sick-day rules, most people live full and active lives.

A quiet reminder

Steroid safety is the single most important habit.

Sick-day rules, an emergency injection kit and a medic-alert identifier prevent almost every adrenal crisis.

  1. 01 Steroid safety

    Learn your sick-day rules

    Double your hydrocortisone during illness, carry an emergency injection and a medic-alert identifier, and know when to seek help.

  2. 02 Review

    Regular endocrine follow-up

    Annual review of every hormone axis, symptoms, blood pressure, bone health and quality of life keeps replacement on track.

  3. 03 Planning

    Plan ahead for pregnancy

    Fertility and hormone replacement can usually be adjusted safely. Speak to your endocrinologist before trying to conceive.

  4. 04 Support

    Use the Pituitary Foundation

    Patient information, helpline support and local groups make living with pituitary disease easier over the long term.

Frequently asked

Everything we get asked about hypopituitarism.

Quick answers on causes, hormone testing, urgent care and long-term replacement.

  • What is hypopituitarism?

    Hypopituitarism is a deficiency of one or more hormones produced by the pituitary gland. It can involve cortisol, thyroid hormone, sex hormones, growth hormone, prolactin and antidiuretic hormone in any combination, and is usually managed lifelong with tailored hormone replacement.

  • What causes hypopituitarism?

    The commonest causes are pituitary tumours and their treatment with surgery or radiotherapy. Others include pituitary apoplexy, Sheehan syndrome after postpartum haemorrhage, traumatic brain injury, autoimmune and lymphocytic hypophysitis, checkpoint-inhibitor immunotherapy, infiltrative disease such as sarcoidosis or haemochromatosis, and rare congenital genetic causes.

  • Which hormone deficiency is the most urgent?

    ACTH deficiency, which causes secondary adrenal insufficiency, is the most urgent because untreated cortisol deficiency can cause an adrenal crisis. Hydrocortisone is replaced first, and thyroid hormone is only started once cortisol is safely covered.

  • How is hypopituitarism diagnosed?

    Diagnosis combines a full pituitary blood profile, dynamic pituitary testing such as an insulin tolerance or glucagon test, a dedicated pituitary MRI and formal visual field assessment. Tests are arranged and interpreted by a specialist commissioned endocrine team.

  • What are sick-day rules?

    Sick-day rules are the steps taken by anyone on hydrocortisone replacement during illness, vomiting or major surgery. Oral doses are usually doubled or tripled, an intramuscular hydrocortisone injection is used if vomiting or drowsy, and hospital review is arranged early. A medic-alert identifier is essential.

  • Can hypopituitarism be reversed?

    Some causes, such as lymphocytic hypophysitis, checkpoint-inhibitor hypophysitis or pituitary apoplexy, can improve with treatment. Others, such as post-surgical or post-radiotherapy deficiency, are usually permanent. Even when hormone deficiency is permanent, careful replacement restores quality of life and prevents complications.

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