stress blood test explained
Informed by recognized medical guidance
Overview
A stress blood test is a blood test that measures levels of cortisol, a hormone your body releases in response to stress. It helps doctors see how well your adrenal glands (small glands on top of your kidneys) are working.
Key facts
- Cortisol is often called the stress hormone because it helps your body respond to stress.
- The test usually involves taking a blood sample in the morning and sometimes again in the evening.
- Abnormal cortisol levels may point to conditions like Cushing's syndrome (too much cortisol) or Addison's disease (too little).
This test is not done routinely, but it is a standard test when a doctor suspects a problem with cortisol production.
It may be recommended for people with symptoms of high or low cortisol, such as unexplained weight gain, fatigue, or changes in blood pressure.
Symptoms
- Sudden severe headache, vision changes, or seizure
- Fainting or loss of consciousness
- Severe abdominal pain with nausea and vomiting
- Very low blood pressure symptoms: lightheadedness that doesn't go away
- ⚠Persistent vomiting that prevents keeping fluids down
- ⚠Extreme weakness that makes it hard to stand
- ⚠New swelling of the face or legs
Common symptoms
- Unexplained weight gain, especially around the face and belly
- Severe fatigue and weakness
- High blood pressure or low blood pressure
- Mood changes like irritability or depression
- Changes in skin, such as easy bruising or purple stretch marks
Symptoms in children
- Slow growth or short stature
- Delayed puberty
- Excessive weight gain or obesity
- Extreme tiredness
Symptoms in older adults
- Muscle weakness and loss of bone density
- Confusion or memory problems that are new
- Higher risk of infections due to weakened immune system
Causes
Main causes
- Tumours on the pituitary gland or adrenal glands (benign – not cancer)
- Long-term use of steroid medications
- Autoimmune diseases that damage the adrenal glands
- Stress from severe illness or injury
Risk factors
- Taking high-dose or long-term corticosteroid drugs
- Having a family history of adrenal gland disorders
- Having certain rare genetic conditions
- Surgery or trauma that affects the pituitary or adrenal glands
When to see a doctor
See a doctor urgently if:
- If you have sudden, severe symptoms like fainting or extreme weakness
- If you are vomiting and cannot keep down fluids
- If you have a high fever and feel confused
Book a routine appointment if:
- If you have long-term symptoms like fatigue, weight changes, or blood pressure problems
- If you have taken steroid medicines for months and are concerned about side effects
Diagnosis
Your doctor will ask about your symptoms, medical history, and any medications. They may order a stress blood test to measure cortisol levels at specific times.
Tests that may be done
- Morning and evening blood cortisol tests
- Dexamethasone suppression test (taking a small pill to see how your body suppresses cortisol)
- Saliva cortisol test (sometimes done instead of blood)
- 24-hour urine cortisol test
What to expect at your appointment
The test is a simple blood draw. You may be asked to have blood taken early in the morning and again later in the day. For the suppression test, you take a pill at night and have blood drawn the next morning. It is safe and usually takes about 5–10 minutes.
Treatment
Treatment depends on whether cortisol levels are too high or too low. Your doctor will create a plan based on the underlying cause. This often involves medication, lifestyle changes, and regular monitoring.
Self-care at home
- Take your medicines exactly as prescribed
- Avoid sudden stops of steroid medications without doctor approval
- Wear a medical alert bracelet if you have an adrenal condition
- Keep a log of your symptoms to share with your doctor
Medical treatments
If cortisol is too high, treatment may include medications that reduce cortisol production or surgery to remove a tumour. If cortisol is too low, you may need to take a replacement steroid hormone, usually in pill form. Your doctor will adjust the dose based on your needs. Never change your dose without talking to your doctor.
When is surgery considered?
Surgery may be needed if a tumour on the pituitary or adrenal gland is causing high cortisol. In some cases, the tumour is removed, and cortisol levels return to normal.
Living with this condition
Living with a cortisol disorder requires regular check-ups and possibly daily medication. Most people can manage their condition with treatment and lead a normal life.
Lifestyle tips
- Learn to recognise signs of low or high cortisol (like severe fatigue or sudden weight gain)
- Avoid stress when possible – try relaxation techniques like deep breathing
- Get enough sleep – cortisol follows a daily rhythm, so good sleep helps
- Carry a card or wear a bracelet explaining your condition in case of emergency
Diet and exercise
Eat a balanced diet with plenty of fruits, vegetables, and whole grains. Avoid too much sugar and processed foods. Exercise is good, but start slowly and listen to your body. If you have low cortisol, you may need extra salt – ask your doctor.
Mental health and emotional wellbeing
Chronic cortisol problems can affect mood, causing anxiety or depression. It is normal to feel worried. Talk to your doctor if you are struggling emotionally. Counselling or support groups can help.
Prevention
Most causes of cortisol imbalance (like tumours or autoimmune diseases) cannot be prevented. However, if you take steroid medication, you can work with your doctor to use the lowest effective dose for the shortest time.
Screening programmes
There is no routine screening test for cortisol problems unless you have symptoms or risk factors.
Complications
If left untreated
- If cortisol is too high: osteoporosis (weak bones), high blood pressure, diabetes, and increased infections
- If cortisol is too low: adrenal crisis (life-threatening drop in blood pressure)
- Long-term symptoms can damage your heart and immune system
Long-term outlook
With proper diagnosis and treatment, most people with cortisol disorders do very well. Treatment is effective at managing symptoms and preventing complications. Regular follow-up helps keep you healthy.
Find support
Local organisations
- Endocrine Society: Patient Resources ↗ · International
Helplines
External links open third-party websites. Ruqelo Health is not responsible for external content. Listing an organisation does not imply endorsement.
Always verify with your doctor
Health guidelines vary by country and region. The information in this article is based on international clinical guidelines but may not reflect the specific guidelines, medications, or practices in your country. Always discuss your health concerns with your own doctor or healthcare provider, and refer to your local national health guidelines where available.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.
Related conditions
Sources and guidance
This article is educational and is prepared with reference to recognized health information and clinical guidance sources where available. Specific source links may vary by topic.
Last updated: July 30, 2026
Educational note: This information is for education only and is not a diagnosis.
Use it to support, not replace, advice from a licensed clinician.
If symptoms are severe, worsening, or urgent, call your local emergency number or seek emergency care.