The hallmark symptoms of adrenal insufficiency are chronic fatigue, muscle weakness, unintentional weight loss, and low blood pressure. These develop because your adrenal glands no longer produce enough cortisol, a hormone that regulates energy, blood pressure, blood sugar, and your body’s stress response. Symptoms often build gradually over weeks or months, which is why the condition frequently goes undiagnosed until a sudden physical stress like an illness or injury triggers a more severe episode.
The Most Common Symptoms
Fatigue is nearly universal and tends to be persistent, not the kind that improves with rest. Muscle weakness accompanies it, making everyday physical tasks feel disproportionately difficult. Most people also experience a noticeable drop in appetite and lose weight without trying. Abdominal pain, nausea, vomiting, and diarrhea are common enough that some people are initially misdiagnosed with a gastrointestinal condition.
Low blood pressure is another core feature, and it often worsens when you stand up quickly, causing dizziness or fainting. This happens because cortisol helps maintain vascular tone, and without enough of it, your blood vessels can’t constrict properly when you change positions. Low blood sugar episodes can also occur, leaving you feeling shaky, confused, or lightheaded between meals.
Other frequently reported symptoms include:
- Joint pain and general body aches
- Intense cravings for salty foods
- Irregular or absent menstrual periods
- Reduced interest in sex
Why Salt Cravings Happen
In primary adrenal insufficiency (Addison’s disease), the adrenal glands stop producing adequate aldosterone, the hormone responsible for telling your kidneys to hold onto sodium. Without it, your body loses sodium through urine at an abnormally high rate, which also pulls water out with it and contributes to dehydration and low blood pressure. Your brain detects this sodium deficit and responds by generating a strong, sometimes overwhelming desire for salty foods. This craving is a genuine physiological signal, not a preference. In one well-known case study, a child who couldn’t produce aldosterone ate large amounts of salt instinctively from a very young age, driven entirely by the body’s attempt to compensate for continuous sodium loss.
Skin Darkening in Addison’s Disease
One of the most distinctive signs of primary adrenal insufficiency is skin that gradually becomes darker, sometimes resembling a deep tan. This happens through a chain reaction: when the adrenal glands fail, the brain’s pituitary gland ramps up production of a signaling molecule called ACTH in an attempt to stimulate them. ACTH is made from the same precursor molecule as melanocyte-stimulating hormone, which triggers pigment-producing cells in your skin to generate more melanin.
The darkening tends to be most visible in sun-exposed areas like the face and the backs of the hands, but it also concentrates in skin folds, palmar creases, the armpits, nipples, and around the mouth and genitals. Some people develop new freckles, darkened nail beds, or bluish-black discoloration on mucous membranes inside the mouth. This symptom only occurs in primary adrenal insufficiency, not secondary forms, because the mechanism depends on excess ACTH production from the pituitary gland.
How Secondary Adrenal Insufficiency Differs
Secondary adrenal insufficiency occurs when the pituitary gland (located at the base of the brain) fails to produce enough ACTH. The most common cause is prolonged use of corticosteroid medications like prednisone, which suppresses the pituitary’s signaling over time. Because the problem originates in the pituitary rather than the adrenal glands, two key symptoms are absent: there’s no skin darkening and typically no severe salt imbalance, since aldosterone production remains mostly intact through a separate control system.
The remaining symptoms, including fatigue, weakness, low blood pressure, nausea, and weight loss, overlap significantly with primary adrenal insufficiency. This makes secondary forms harder to identify based on symptoms alone, since there’s no visible skin change to raise suspicion.
Mood, Sleep, and Cognitive Effects
Cortisol plays a significant role in brain function, particularly in areas involved in memory, processing speed, and emotional regulation. When cortisol drops too low, many people experience depression, irritability, and reduced motivation. These are often the symptoms that affect daily quality of life most, yet they’re frequently attributed to other causes before adrenal insufficiency is considered.
Sleep disturbances, including insomnia and unrefreshing sleep, are common. Some people report difficulty concentrating, slower thinking, or trouble recalling information. Low sodium levels in the blood, which can accompany primary adrenal insufficiency, contribute to these cognitive symptoms by causing mild brain swelling. In rare and severe cases, particularly during adrenal crisis, more serious neuropsychiatric symptoms like confusion, disorientation, or even psychosis have been documented, though these are uncommon as an initial presentation.
Symptoms in Children
Children with adrenal insufficiency share many of the same symptoms as adults, including fatigue, nausea, vomiting, abdominal pain, and salt craving. The distinguishing feature in pediatric cases is slowed growth. A child who falls off their expected growth curve without an obvious explanation may warrant evaluation for adrenal problems. Delayed puberty can also be a sign, particularly when adrenal insufficiency is part of a broader pituitary hormone deficiency.
Low blood sugar episodes tend to be more pronounced in children, especially when adrenal insufficiency is combined with growth hormone deficiency. Severe hypoglycemia in children can lead to seizures or loss of consciousness, making it one of the more urgent presentations in pediatric cases.
Adrenal Crisis: The Emergency Scenario
Adrenal crisis is a life-threatening escalation that can occur when someone with adrenal insufficiency encounters severe physical stress, such as an infection, surgery, or injury, without adequate cortisol replacement. It can also be the first presentation of adrenal insufficiency in people who haven’t yet been diagnosed.
The symptoms come on rapidly and are far more intense than chronic adrenal insufficiency. They include severe abdominal or flank pain, persistent vomiting, high fever, extreme weakness, rapid heart rate, and a dangerous drop in blood pressure. Confusion, disorientation, and loss of consciousness can follow as the body loses its ability to maintain basic cardiovascular function. Excessive sweating on the face and palms is another characteristic sign. Without emergency treatment, adrenal crisis can be fatal.
People already diagnosed with adrenal insufficiency are typically taught to recognize early warning signs of crisis, such as unusual vomiting, worsening weakness, or dizziness that doesn’t resolve, so they can adjust their medication and seek help before the situation becomes critical.
How the Diagnosis Is Confirmed
Because the symptoms of adrenal insufficiency overlap with many other conditions, including thyroid disorders, depression, and chronic fatigue syndrome, a blood test is needed to confirm the diagnosis. The standard approach is a stimulation test: a synthetic version of ACTH is injected, and cortisol levels are measured 30 to 60 minutes later. Historically, a cortisol response below 18 micrograms per deciliter was considered diagnostic, though newer, more precise lab assays have shifted that threshold down to around 14 to 15 micrograms per deciliter. A baseline cortisol level below 2 micrograms per deciliter before the test is strongly suggestive of adrenal insufficiency on its own.
Once the diagnosis is confirmed, additional testing helps determine whether the cause is primary (adrenal gland damage) or secondary (pituitary dysfunction), which matters because the treatment approach and monitoring differ between the two.