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Health condition · Clinically reviewed

Endocrine hypertension, the treatable causes hiding behind resistant blood pressure.

Around one in ten cases of secondary hypertension is driven by a hormone disorder. Finding it changes the treatment - and sometimes cures the problem entirely.

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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 NICE, ESC/ESH and Endocrine Society sources you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK pathways for aldosterone-renin ratio testing, metanephrines and specialist adrenal surgery.

Key facts

Endocrine hypertension at a glance.

The essentials, in plain English - what it is, who it affects, and why finding a hormonal cause changes everything.

  • What it is

    High blood pressure driven by a hormonal disorder rather than essential (primary) hypertension. Around 10 to 15 per cent of secondary hypertension is endocrine.

  • Most common cause

    Primary hyperaldosteronism (Conn syndrome) - either a unilateral adrenal adenoma or bilateral adrenal hyperplasia.

  • Why it matters

    Endocrine causes are often curable or treatment-limiting - missing them means lifelong resistant hypertension and avoidable end-organ damage.

  • When to screen

    Early-onset, resistant or severe hypertension, hypertension with low potassium, adrenal incidentaloma, or a specific hormonal phenotype.

  • Key phenotypes

    Phaeochromocytoma triad (headache, palpitations, sweating), Cushingoid features, hyperthyroid features, hypercalcaemia and acromegaly.

  • Where care happens

    Specialist endocrinology, cardiology and hypertension clinics - with adrenal surgery and complex pathways in commissioned UK centres.

Why this guide matters

One in ten secondary cases - and often curable.

Endocrine hypertension is under-recognised in the UK. The three points below shape when to screen, how to test and what changes for treatment.

  • Pattern beats presumption

    Resistant, early-onset, severe or hypokalaemic hypertension - or an obvious hormonal phenotype - should always trigger secondary screening.

  • The right test in the right order

    Aldosterone-renin ratio, metanephrines and cortisol screening come before imaging - imaging alone can mislead.

  • Surgery can be curative

    A unilateral adrenal adenoma or a resectable pituitary lesion can normalise blood pressure and, sometimes, remove the need for medication.

How the diagnosis is made

From resistant readings to a named cause.

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

  1. 01

    Screening

    Recognise the pattern

    Early-onset, resistant, severe or hypokalaemic hypertension - or hypertension with a hormonal phenotype - triggers a secondary work-up.

  2. 02

    Screening

    Baseline bloods and urine

    U and Es, sodium, potassium, eGFR, FBC, LFTs, glucose, HbA1c, lipids, urinalysis and urine albumin-creatinine ratio.

  3. 03

    Screening

    Aldosterone-renin ratio (ARR)

    The first-line screen for primary hyperaldosteronism. Interfering drugs (MRAs 4 to 6 weeks, beta-blockers 2 weeks) are adjusted where safe.

  4. 04

    Confirming

    Metanephrines and other hormones

    Plasma or 24-hour urinary metanephrines for phaeochromocytoma. Dexamethasone suppression or salivary cortisol for Cushing. TSH, PTH, calcium and IGF-1 as indicated.

  5. 05

    Confirming

    Confirmatory endocrine tests

    Saline or fludrocortisone suppression for aldosteronism, ACTH-based work-up for Cushing, and OGTT with growth hormone for acromegaly.

  6. 06

    Planning

    Imaging and localisation

    Adrenal CT or MRI, pituitary MRI, MIBG or 68Ga-DOTATATE PET-CT, and adrenal vein sampling in commissioned centres.

  7. 07

    Planning

    Genetics and MDT plan

    Genetic testing for phaeo, paraganglioma and pituitary syndromes where relevant. Endocrine, cardiology, surgical and hypertension MDT sets the plan.

Typical timeline: weeks for biochemistry, a few more for imaging and MDT planning.

Signs and phenotypes

What endocrine hypertension can look like.

Each cause has its own tell - resistant readings, low potassium, spells, Cushingoid features, or an incidental adrenal nodule.

  • Resistant hypertension

    Blood pressure that stays high on three or more antihypertensives (including a diuretic) at optimal doses.

  • Hypokalaemia

    A low or low-normal potassium - especially on a diuretic - raises the suspicion of primary hyperaldosteronism.

  • Paroxysmal spells

    Episodes of headache, palpitations and sweating with surges in blood pressure suggest phaeochromocytoma.

  • Cushingoid features

    Central obesity, moon face, purple striae, easy bruising, new diabetes and thin skin point to cortisol excess.

  • Adrenal incidentaloma

    A nodule found on scanning for another reason - all need biochemical screening before dismissal.

  • Thyroid disease

    Hyperthyroid and, less often, hypothyroid states can raise blood pressure and warrant thyroid function tests.

  • Acromegalic phenotype

    Enlarging hands, feet and jaw, spaced teeth and coarsening features suggest growth hormone excess.

  • Red flag - severe or early-onset

    Very high readings, hypertensive emergencies, or new hypertension under 40 - always screen for a secondary cause.

Treatment

How endocrine hypertension is treated.

Treatment follows the cause - targeted surgery, targeted drugs and, only then, a rationalised antihypertensive regimen.

  • Adrenalectomy - unilateral aldosteronism

    Laparoscopic adrenalectomy for a lateralising adenoma - often curative and can normalise blood pressure or dramatically reduce drug burden.

  • Mineralocorticoid receptor antagonists

    Spironolactone or eplerenone for bilateral adrenal hyperplasia - with amiloride as an alternative or add-on.

  • Phaeochromocytoma preparation

    Alpha-blockade (phenoxybenzamine or doxazosin) first, then a beta-blocker if needed, plus volume repletion before adrenal surgery.

  • Trans-sphenoidal pituitary surgery

    The first-line treatment for Cushing disease and for growth-hormone-secreting adenomas causing acromegaly.

  • Medical therapy for cortisol excess

    Ketoconazole, metyrapone, osilodrostat, pasireotide, mifepristone or mitotane - used before or instead of surgery in selected cases.

  • Somatostatin analogues and pegvisomant

    Octreotide, lanreotide, pasireotide and pegvisomant for acromegaly not fully controlled by surgery.

  • Antithyroid and parathyroid pathways

    Antithyroid drugs, radioiodine or thyroidectomy for hyperthyroidism, and parathyroidectomy for primary hyperparathyroidism.

  • Rationalise antihypertensives

    Once the endocrine cause is treated, medication is stepped down carefully - many patients need fewer drugs, and some none at all.

What this guide is based on

The sources behind every claim on this page.

UK national guidance, specialist society standards and NHS England service specifications, 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 GP or specialist knows your history and can tell you which parts apply to you. If in doubt, get seen.

  • NICE. Hypertension in adults: diagnosis and management (NG136).

  • ESC and ESH. Guidelines for the management of arterial hypertension.

  • Endocrine Society. Clinical practice guidelines - primary aldosteronism, phaeochromocytoma and paraganglioma, Cushing syndrome, acromegaly.

  • British Hypertension Society. Position statements on secondary hypertension and resistant hypertension.

  • NHS England service specifications for specialist adrenal, pituitary and endocrine cancer services.

Red flags

When endocrine hypertension needs urgent attention.

Most endocrine hypertension is worked up in clinic. These are the situations that need faster action, and where a specialist opinion is essential.

  • Hypertensive emergency

    Very high blood pressure with acute organ damage - chest pain, breathlessness, neurological symptoms or visual change - needs immediate hospital assessment.

  • Phaeochromocytoma crisis

    A surge of catecholamines can cause severe hypertension, arrhythmia or shock. Untreated phaeo is dangerous in pregnancy and surgery.

  • Severe hypokalaemia

    Weakness, arrhythmia or paralysis from very low potassium needs urgent correction alongside investigation for aldosteronism.

  • New-onset diabetes with Cushingoid features

    Rapid weight gain, striae and new diabetes deserve a same-week Cushing screen and endocrinology referral.

  • Adrenal incidentaloma over 4 cm

    Larger adrenal lesions - or ones with worrying imaging features - need urgent specialist review to exclude malignancy or a functioning tumour.

  • Family history of endocrine tumours

    MEN2, von Hippel-Lindau, neurofibromatosis type 1 and SDHx families need genetic counselling and surveillance from an early age.

  • Pregnancy and undiagnosed secondary hypertension

    New severe or resistant hypertension in pregnancy needs urgent obstetric and endocrine input.

  • Rapid visual change with pituitary features

    Headache, visual field loss or new endocrine deficiency can signal an expanding pituitary lesion - an urgent neuro-endocrine review.

  • Liquorice or supplement excess

    Chronic liquorice ingestion mimics mineralocorticoid excess - stopping it plus review is often enough.

Living with it

A treatable diagnosis, with a clear pathway.

Four things that make the biggest difference - screening at the right moment, careful preparation for tests, a coordinated MDT and long-term follow-up.

A quiet reminder

Ask early, and ask again.

If your blood pressure feels wrong for your age or refuses to settle on medication, ask for a secondary work-up. It is a simple conversation with a big potential upside.

  1. 01 Screen

    Get the right tests early

    Ask for a secondary hypertension work-up if your blood pressure is resistant, severe, hypokalaemic or started under 40.

  2. 02 Prepare

    Medication interference

    Some antihypertensives interfere with hormone tests. Your specialist may adjust drugs before an aldosterone-renin ratio or metanephrines.

  3. 03 MDT

    A team of specialists

    Endocrinology, cardiology, adrenal and pituitary surgery, radiology and genetics all play a role - expect a coordinated plan.

  4. 04 Long-term

    Life after treatment

    Even when a tumour is cured, follow-up matters - blood pressure, potassium, hormone levels and surveillance for hereditary syndromes.

Frequently asked

Everything we get asked about endocrine hypertension.

Quick answers on who to screen, which tests come first, and what treatment looks like.

  • What is endocrine hypertension?

    Endocrine hypertension is high blood pressure caused by a hormone-producing disorder rather than essential hypertension. It accounts for roughly 10 to 15 per cent of all secondary hypertension and is important to spot because it is often curable or treatment-limiting.

  • Who should be screened for it?

    People with early-onset hypertension (under 40), resistant hypertension on three or more drugs, severe hypertension over 180/110, hypertension with low potassium, an adrenal incidentaloma, a specific hormonal phenotype (such as the phaeochromocytoma triad or Cushingoid features), or a family history of endocrine tumour syndromes.

  • What is the most common endocrine cause?

    Primary hyperaldosteronism (Conn syndrome) is the most common - either a unilateral aldosterone-producing adenoma or bilateral adrenal hyperplasia. It is diagnosed with an aldosterone-renin ratio, confirmatory testing, adrenal imaging and, where surgery is being considered, adrenal vein sampling.

  • How is phaeochromocytoma tested for?

    The first-line tests are plasma or 24-hour urinary metanephrines. If elevated, adrenal imaging (CT or MRI), functional imaging such as MIBG or 68Ga-DOTATATE PET-CT, and genetic testing are arranged through a specialist centre.

  • Can endocrine hypertension be cured?

    Often, yes. A unilateral adrenal adenoma removed laparoscopically can cure aldosteronism, phaeochromocytoma and adrenal Cushing. Pituitary surgery can cure Cushing disease and acromegaly. Even where a full cure is not possible, targeted medical therapy usually improves control dramatically.

  • Will I still need blood pressure medication afterwards?

    Many people need fewer drugs after treatment, and some come off medication entirely. Your specialist will step down antihypertensives carefully and monitor potassium, hormone levels and blood pressure long term.

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