baldness CT scan preparation
Informed by recognized medical guidance
Overview
A CT scan (computed tomography) is a special X-ray that creates detailed cross-sectional images of the body. When used to look at the head and scalp, it can help doctors see the skull, blood vessels, and some soft tissues. For hair loss, a CT scan is not a routine test. Your doctor may only ask for one if they suspect an underlying problem in your scalp, sinuses, or brain that could be causing the hair loss.
Key facts
- A CT scan is painless and usually takes only a few minutes.
- Most hair loss is diagnosed from a medical history and a physical exam, not from imaging.
- Contrast dye may be used during the scan to make blood vessels clearer, but you'll be told about this beforehand.
No. CT scans are very common tests in general, but they are rarely used specifically for hair loss. Most people with baldness will never need one.
People who have unexplained hair loss, sudden patchy hair loss, or other symptoms like headaches or sinus pain may be sent for a CT scan to check for hidden causes.
Symptoms
- Call your local emergency number immediately if you have sudden, painful scalp swelling along with hair loss.
- Call emergency services if hair loss is accompanied by severe headache, vision changes, or weakness on one side of the body.
- ⚠Contact your doctor the same day if you have scalp redness, pus, or a fever along with hair loss.
- ⚠Seek same-day care if your hair falls out very quickly, over a few days, without an obvious cause.
Common symptoms
- Gradual thinning of hair on the top of the head
- Receding hairline
- Patchy or circular bald spots
Symptoms in children
- Hair loss in children often appears as patches, and it may be caused by fungal infections or a habit of pulling hair.
Symptoms in older adults
- Hair thins naturally with age, and the hairline often recedes.
Causes
Main causes
- Genetics — a family history of pattern baldness
- Hormone changes — for example, during pregnancy, menopause, or thyroid problems
- Stress or illness — sudden shedding can occur a few months after a stressful event
Risk factors
- Family history
- Certain medications or medical treatments
- Harsh hair products or hairstyles that pull the hair
When to see a doctor
See a doctor urgently if:
- If you have scalp pain, swelling, or signs of infection along with hair loss
- If hair loss is sudden and you also have a fever, headache, or vision problems
Book a routine appointment if:
- If you notice thinning hair and it bothers you
- If you have bald patches that grow larger over several weeks
Diagnosis
To find out what's causing your hair loss, your doctor will take a careful medical history and examine your scalp. They may pull a few hairs gently to see how many come out. They might also look at your scalp with a special magnifying tool.
Tests that may be done
- Medical history and scalp exam
- Blood tests to check hormones, iron, and thyroid function
- Scalp biopsy (taking a very small piece of skin to look at under a microscope)
- CT scan of the head — only if an underlying condition is suspected
What to expect at your appointment
If you have been referred for a CT scan, you will be asked to remove any metal objects like jewellery, glasses, or hairpins. You may be asked not to eat or drink for a few hours before the scan if contrast dye will be used. During the scan, you lie on a table that slides into a doughnut-shaped machine. It is painless and you can usually go home straight after.
Treatment
Treatment for hair loss depends on the cause. In many cases, the hair regrows on its own. For pattern baldness, treatments aim to slow further loss and sometimes help new hair grow. Your doctor will talk to you about what is likely to help for your specific situation.
Self-care at home
- Be gentle with your hair — avoid very tight braids, buns, or weaves
- Use a mild shampoo and avoid harsh chemicals or heat styling
- Eat a balanced diet with plenty of iron, protein, and vitamins
Medical treatments
There are several medical treatments available for common types of hair loss. Some are creams or foams applied to the scalp, and others are taken as tablets. Some can also be given as injections into the scalp. These medicines work best when they are started early, and they need to be used long-term to keep the benefit. Your doctor will explain which option, if any, is suitable for you.
When is surgery considered?
Surgery, such as hair transplant surgery, is an option for some people when other treatments haven't worked. This involves moving healthy hair follicles from one part of the scalp to another. It is a decision to make with a specialist.
Living with this condition
Many people find ways to feel comfortable with their hair loss. This might include a new hairstyle, hair fibres, a wig, or simply getting used to a different look. There is no right way to manage it — whatever helps you feel confident is the best choice.
Lifestyle tips
- Find a gentle hair care routine that works for you
- Protect your scalp from sunburn by wearing a hat or using SPF
- Talk to friends or family if hair loss is affecting your mood
Diet and exercise
A balanced diet and regular exercise help keep your body healthy, and that supports hair health too. You do not need special foods, but make sure you get enough protein, iron, and vitamins from your meals.
Mental health and emotional wellbeing
Hair loss can feel upsetting and affect how you see yourself. It's completely normal to feel frustrated, anxious, or sad about it. Talking to someone you trust can help. If the feelings are overwhelming, consider speaking with a counsellor.
Prevention
Not all hair loss can be prevented, especially if it runs in your family. But you can reduce the risk of hair damage by being gentle with your hair and avoiding hairstyles that pull tightly. Managing stress and eating well may also help.
Complications
If left untreated
- Emotional distress and low self-confidence
- Sunburn on exposed scalp
- If the underlying cause is a medical condition, that condition may go undetected
Long-term outlook
For many types of hair loss, the outlook is good. Some hair loss is temporary, and hair often grows back. Even when hair loss is permanent, there are effective ways to manage it and look and feel your best.
Find support
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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.
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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 31, 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.