Sheehan’s syndrome: symptoms, causes, diagnosis, MRI findings and treatment

Sheehan’s syndrome is a potentially serious hormonal disorder that can develop after severe blood loss or very low blood pressure during or shortly after childbirth. The condition occurs when the pituitary gland does not receive enough oxygen-rich blood and part of the gland becomes damaged or dies. Because the pituitary controls several important hormones, the effects can involve the thyroid, adrenal glands, reproductive system, metabolism and overall energy levels.

One of the challenging things about Sheehan’s syndrome is that it may not be obvious immediately after delivery. Some women notice problems with breastfeeding or menstrual periods soon after childbirth, while others develop symptoms gradually over many years. Fatigue, weakness, low blood pressure, hair loss and changes in body weight can easily be mistaken for other conditions.

The good news is that Sheehan’s syndrome can usually be managed effectively once it is diagnosed. Treatment mainly involves replacing the hormones that the pituitary gland can no longer produce adequately.

What is Sheehan’s syndrome?

Sheehan’s syndrome is also called postpartum hypopituitarism or postpartum pituitary necrosis. It develops when severe postpartum hemorrhage causes significant hypotension and reduces blood flow to the pituitary gland.

During pregnancy, the pituitary gland becomes larger, particularly because of the growth of prolactin-producing cells. This increased size makes the gland more vulnerable to reduced blood supply. If a woman experiences major blood loss and circulatory shock during or after childbirth, the enlarged pituitary may become ischemic and suffer permanent damage.

The amount of pituitary damage varies from person to person. Some women develop deficiencies of only a few hormones, while others develop severe or complete anterior pituitary failure.

What is the most common cause of Sheehan syndrome?

The most common cause of Sheehan syndrome is severe postpartum hemorrhage accompanied by hypotension or shock.

Blood loss during childbirth can occur because of uterine atony, placental problems, retained placental tissue, uterine rupture or other obstetric complications. Severe blood loss lowers circulating blood volume and blood pressure. As a result, the pituitary gland may receive insufficient oxygen.

Importantly, postpartum hemorrhage does not automatically mean a woman will develop Sheehan’s syndrome. The risk depends on the severity and duration of blood loss, the degree of hypotension and individual susceptibility.

Modern obstetric care has made Sheehan’s syndrome much less common in many countries. However, it remains an important cause of hypopituitarism in areas where access to emergency obstetric care and blood transfusion is limited.

What are the first signs of Sheehan syndrome?

The earliest signs may be subtle, but failure to produce breast milk after childbirth is one of the classic early clues. A woman may notice that her milk never comes in or that she is unable to breastfeed despite otherwise appropriate breastfeeding support.

Another important early sign is the failure of menstrual periods to return after childbirth. Some women develop secondary amenorrhea, meaning their periods stop after previously occurring normally.

Other early or gradually developing symptoms can include:

• Persistent tiredness or weakness
• Low blood pressure or dizziness
• Reduced libido
• Loss of axillary or pubic hair
• Difficulty concentrating
• Cold intolerance
• Dry skin
• Changes in body weight
• Infertility
• Recurrent low blood sugar
• Headaches
• Nausea
• Increased sensitivity to physical stress

Symptoms may appear immediately, but it is also possible for Sheehan’s syndrome to remain undiagnosed for years.

What are the symptoms of Sheehan’s syndrome?

Symptoms depend on which pituitary hormones have been affected and how much of the gland has been damaged.

Common symptoms include failure of lactation, amenorrhea, fatigue, weakness, low blood pressure, loss of body hair and reduced libido.

Hormonal deficiencies can produce different patterns of symptoms:

Growth hormone deficiency: Adults may experience reduced muscle mass, lower exercise capacity, changes in body composition and reduced quality of life.

Prolactin deficiency: This can result in failure to establish lactation after childbirth.

FSH and LH deficiency: Low levels of these hormones can cause amenorrhea, infertility, vaginal dryness, reduced libido and loss of body hair.

ACTH deficiency: This can result in low cortisol levels, causing fatigue, weakness, nausea, low blood pressure, low blood sugar and, in severe cases, adrenal crisis.

TSH deficiency: Central hypothyroidism may cause tiredness, cold intolerance, dry skin, constipation, slowed thinking and weight changes.

In severe cases, multiple deficiencies can occur together, resulting in panhypopituitarism.

Which hormone is the first to decrease in Sheehan’s syndrome?

Traditionally, growth hormone (GH) is considered the first pituitary hormone to become deficient, followed by prolactin, gonadotropins such as FSH and LH, ACTH and finally TSH.

However, the exact pattern is not identical in every patient. The extent and distribution of pituitary damage determine which hormone deficiencies develop first and how severe they become.

Growth hormone and prolactin are particularly vulnerable to pituitary injury, while severe necrosis can eventually affect most or all anterior pituitary hormones.

What is partial Sheehan’s syndrome?

Partial Sheehan’s syndrome means that the pituitary gland has been damaged after postpartum hemorrhage, but not all pituitary hormones are deficient.

For example, a woman may have growth hormone and gonadotropin deficiencies while retaining enough ACTH and TSH function. Another patient may have adrenal and thyroid axis abnormalities without complete panhypopituitarism.

This distinction matters because symptoms and treatment depend on the specific hormones that are deficient.

Partial disease can also be harder to recognize. A woman may simply feel tired, have irregular periods or experience reduced libido for years without realizing that these symptoms are connected to an old childbirth complication.

What are the risk factors for Sheehan syndrome?

The major risk factor is severe postpartum hemorrhage, particularly when it causes prolonged hypotension or shock.

Other circumstances associated with increased risk include:

• Major blood loss during or after delivery
• Severe hypotension
• Hypovolemic shock
• Need for substantial blood transfusion
• Placental abruption
• Retained placenta
• Uterine rupture
• Severe uterine atony
• Disseminated intravascular coagulation
• Limited access to emergency obstetric care
• Complicated or high-risk deliveries

A previous postpartum hemorrhage may also increase the likelihood of another postpartum hemorrhage in a future pregnancy.

What are the most common causes of hypophysitis?

Hypophysitis is different from Sheehan’s syndrome. Hypophysitis refers to inflammation of the pituitary gland, whereas Sheehan’s syndrome results primarily from ischemic injury caused by postpartum blood loss and hypotension.

The most common form of primary hypophysitis is lymphocytic hypophysitis, which is thought to have an autoimmune basis and is particularly associated with pregnancy and the postpartum period.

Other causes include:

• Autoimmune disorders
• IgG4-related disease
• Sarcoidosis
• Granulomatosis with polyangiitis
• Infections such as tuberculosis or fungal infections
• Pituitary and parasellar lesions
• Immune checkpoint inhibitor medications used in cancer treatment
• Other inflammatory or infiltrative diseases

Because hypophysitis can also occur around pregnancy, it may sometimes need to be distinguished from Sheehan’s syndrome using the clinical history, hormone testing and MRI.

What are the MR imaging findings in Sheehan syndrome?

MRI of the pituitary is an important part of the evaluation.

In the early stage, MRI may show an enlarged pituitary gland with areas of ischemic injury or reduced/heterogeneous enhancement. As the damaged tissue undergoes atrophy, the gland gradually becomes smaller.

In chronic Sheehan’s syndrome, the classic finding is a partial or completely empty sella. An empty sella means that the normal pituitary tissue has become markedly reduced and cerebrospinal fluid occupies much of the space within the sella turcica.

MRI may therefore show:

• Pituitary gland atrophy
• Partial or complete empty sella
• Reduced or absent contrast enhancement in areas of infarction
• Changes consistent with previous pituitary ischemia
• In some cases, herniation of the optic chiasm into the sella

An empty sella is supportive of the diagnosis but is not, by itself, proof of Sheehan’s syndrome. The MRI findings need to be interpreted alongside the obstetric history and hormone results.

How is Sheehan syndrome diagnosed?

Diagnosis usually involves combining medical history, clinical symptoms, blood tests and pituitary MRI.

A detailed pregnancy history is particularly important. Doctors may ask about severe bleeding during childbirth, low blood pressure, shock, blood transfusions, intensive care admission and problems with breastfeeding afterward.

The next step is hormonal evaluation.

What labs are used to diagnose Sheehan syndrome?

Blood tests may include:

• Morning serum cortisol
• ACTH
• TSH
• Free T4
• FSH
• LH
• Estradiol
• Prolactin
• IGF-1 as a marker of growth hormone activity
• Blood glucose
• Serum sodium and other electrolytes
• Complete blood count

Additional stimulation tests may be required when baseline results are inconclusive. These can assess adrenal, growth hormone or other pituitary functions.

An important point is that TSH may appear normal or even mildly elevated despite central hypothyroidism. For this reason, free T4 and the overall clinical picture are important rather than relying on TSH alone.

Hyponatremia, hypoglycemia and anemia may also provide useful clues.

How is Sheehan syndrome treated?

Treatment involves lifelong hormone replacement for the deficiencies that have developed. The exact treatment plan depends on which pituitary functions have been lost.

Cortisol replacement

ACTH deficiency can cause secondary adrenal insufficiency and is one of the most important problems to identify.

Hydrocortisone or another appropriate glucocorticoid may be prescribed. Patients also need to understand that steroid requirements can increase during significant physical stress, such as serious illness, surgery or injury.

Thyroid hormone replacement

Central hypothyroidism is generally treated with levothyroxine.

A crucial safety point is that adrenal insufficiency should be assessed and treated before starting thyroid hormone replacement when both conditions are suspected. Giving thyroid hormone without addressing significant cortisol deficiency can precipitate an adrenal crisis.

Sex hormone replacement

Estrogen and progesterone replacement may be considered in appropriate premenopausal women who have hypogonadism, depending on age, reproductive goals, risks and individual circumstances.

Women who want to become pregnant require specialist fertility management because ovulation may need to be induced using appropriate gonadotropin therapy.

Growth hormone replacement

Growth hormone therapy may be considered in selected adults with confirmed growth hormone deficiency after other hormone deficiencies have been appropriately addressed.

Long-term monitoring is essential because hormone doses may need adjustment over time.

What is another name for Sheehan’s syndrome?

Sheehan’s syndrome is also known as:

• Postpartum hypopituitarism
• Postpartum pituitary necrosis
• Postpartum hypopituitarism syndrome
• Postpartum pituitary insufficiency

The condition is sometimes historically linked with Simmonds’ disease, although the terminology can cause confusion.

What is the difference between Sheehan’s and Simmonds’ disease?

The terms are historically related, and some older sources use them interchangeably.

In modern clinical usage, Sheehan’s syndrome specifically refers to postpartum pituitary damage caused by severe hemorrhage and hypotension, whereas Simmonds’ disease is an older term for severe hypopituitarism or pituitary cachexia caused by various forms of pituitary destruction.

In other words, Sheehan’s syndrome describes a particular cause and setting: postpartum pituitary infarction.

Simmonds’ disease is broader and historically included pituitary failure caused by tumors, infections, destructive lesions and other conditions.

How to differentiate pituitary apoplexy and Sheehan syndrome?

Pituitary apoplexy and Sheehan’s syndrome can both involve acute pituitary injury, but their clinical settings are different.

Sheehan’s syndrome usually follows severe postpartum hemorrhage and hypotension. The presentation may be gradual, with failure to lactate, amenorrhea and progressive symptoms of hypopituitarism.

Pituitary apoplexy is generally a sudden hemorrhage or infarction involving a pituitary lesion, often an adenoma. It classically causes an abrupt, severe headache and may cause visual impairment, double vision, eye-movement abnormalities, vomiting or acute adrenal insufficiency.

MRI is particularly useful. Apoplexy may demonstrate hemorrhagic changes within a pituitary lesion, while Sheehan’s syndrome may show ischemic injury followed by pituitary atrophy and an empty sella.

However, acute Sheehan’s syndrome can occasionally resemble pituitary apoplexy clinically and radiologically. The pregnancy and delivery history is therefore an important diagnostic clue.

What is the incidence of Sheehan’s syndrome?

The incidence varies considerably between countries and populations.

Sheehan’s syndrome has become uncommon in countries with effective management of postpartum hemorrhage, blood transfusion services and modern obstetric care. Cleveland Clinic estimates approximately 5 cases per 100,000 births, although published estimates vary.

Studies from areas with limited obstetric resources have reported substantially higher prevalence. For example, a population study in northern India reported a prevalence of approximately 3% among women over 20 years of age, while Icelandic data have reported approximately 5.1 cases per 100,000 women.

Because symptoms can appear years or even decades after childbirth, the true burden is difficult to measure.

What are the long-term effects of Sheehan syndrome?

Without treatment, Sheehan’s syndrome can have significant long-term consequences.

Persistent hormone deficiencies can contribute to:

• Chronic fatigue and weakness
• Infertility
• Menstrual disturbances
• Reduced libido
• Loss of muscle mass
• Changes in body composition
• Reduced bone density and osteoporosis
• Anemia
• Low blood pressure
• Low sodium levels
• Low blood glucose
• Reduced quality of life
• Cognitive and mood changes

The most serious complication is adrenal insufficiency and adrenal crisis. Severe cortisol deficiency can become life-threatening, particularly during infection, surgery, trauma or other major physical stress.

Appropriate hormone replacement and regular endocrine follow-up can greatly reduce these risks.

When should you see a doctor?

A woman who experienced severe bleeding, shock or a blood transfusion during childbirth should mention that history to her doctor, especially if she later develops unexplained fatigue, absent periods, infertility, low blood pressure or difficulty producing breast milk.

The possibility of Sheehan’s syndrome deserves particular attention when several symptoms occur together.

A history of postpartum hemorrhage from many years ago should not be dismissed simply because the delivery happened a long time in the past. In some cases, the diagnosis is made decades after the triggering pregnancy.

Frequently asked questions about Sheehan’s syndrome

Can Sheehan syndrome be cured?

The damaged pituitary tissue usually does not regenerate, so there is generally no treatment that restores normal pituitary function. However, the hormone deficiencies can often be managed very effectively with appropriate replacement therapy.

Can someone with Sheehan syndrome live a normal life?

Yes. With accurate diagnosis, appropriate hormone replacement and regular medical monitoring, many people can maintain a good quality of life. Treatment adherence and awareness of adrenal insufficiency are particularly important.

Can Sheehan syndrome occur without obvious postpartum hemorrhage?

It is classically associated with severe postpartum hemorrhage and hypotension. However, the bleeding may not always be well documented, especially when the delivery occurred many years earlier. A compatible clinical picture should therefore prompt further evaluation.

Does Sheehan syndrome affect fertility?

It can. Deficiency of FSH and LH can interfere with ovulation and menstrual cycles. However, fertility may sometimes be restored with specialist treatment using appropriate hormone therapy.

Is an empty sella always caused by Sheehan syndrome?

No. Empty sella has several possible causes and can sometimes occur incidentally. In Sheehan’s syndrome, the MRI finding becomes much more meaningful when combined with a history of postpartum hemorrhage and evidence of pituitary hormone deficiencies.

Is Sheehan syndrome hereditary?

No. Sheehan’s syndrome is generally an acquired condition caused by pituitary ischemia following severe postpartum blood loss and hypotension. It is not considered an inherited disorder.

The bottom line

Sheehan’s syndrome is an important cause of postpartum hypopituitarism that can be overlooked because its symptoms are often nonspecific and may appear years after childbirth. Severe postpartum hemorrhage with hypotension is the classic trigger, while failure to lactate and persistent menstrual abnormalities can provide some of the earliest clues.

Growth hormone is traditionally considered the first pituitary hormone to become deficient, although the pattern varies between individuals. Diagnosis relies on a combination of obstetric history, hormone testing and pituitary MRI. Chronic cases commonly show pituitary atrophy and an empty sella.

Treatment focuses on replacing deficient hormones, with particular attention to cortisol and thyroid hormone deficiencies. Once properly diagnosed and managed, Sheehan’s syndrome is a treatable chronic condition, and regular endocrinology follow-up can help prevent serious complications.

Need Help?

If you or someone you know is experiencing symptoms of Sheehan’s Syndrome, visit us at Sparsh Diagnostic Centre for comprehensive hormonal evaluation and imaging.

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