Autoimmune conditions and hair loss: lupus, thyroid disease and alopecia areata

The immune system is designed to protect the body, but in autoimmune conditions it mistakenly targets the body's own tissues. Hair follicles and the scalp can be caught up in this in several ways. Sometimes the immune system attacks the follicles directly, as in alopecia areata. Sometimes a condition such as lupus inflames the scalp. And sometimes an autoimmune disease affects a gland, such as the thyroid, whose hormones the hair cycle depends on.

This guide explains how the most common autoimmune conditions can affect hair, the difference between scarring and non-scarring hair loss, why these conditions often cluster together, which tests a doctor may consider and when early care matters. It is general information, not personal medical advice. If you have an autoimmune condition and notice hair changes, speak to your doctor.

Short answer

• Alopecia areata is an autoimmune condition in which the immune system attacks hair follicles, usually causing round or oval patches of hair loss without scarring ¹².
• Autoimmune thyroid disease can cause an underactive or overactive thyroid, and both can lead to diffuse thinning ³⁴.
• These conditions often occur together. A meta-analysis of 50 studies found thyroid dysfunction and autoimmune thyroid disease were more common in people with alopecia areata ⁵.
• Lupus can affect hair in several ways, from temporary diffuse shedding linked to disease activity to scarring patches in discoid lupus ⁶⁷.
• Scarring hair loss needs early attention, because damaged follicles may not recover. Non-scarring types often improve when the underlying condition is controlled ⁸⁹.
• See a doctor for new patches, a sore or inflamed scalp, or hair loss with other symptoms such as joint pain, rashes or tiredness.

How autoimmunity affects hair

There are three broad ways an autoimmune condition can lead to hair loss:

1. Direct attack on the follicle. In alopecia areata, immune cells gather around the base of growing hairs and disrupt them. The follicle is not destroyed, which is why hair can return ¹⁰.
2. Inflammation that damages the follicle. In discoid lupus and lichen planopilaris, inflammation can scar the follicle so it can no longer produce hair ⁷⁹.
3. Indirect effects on the hair cycle. A flare of illness, fever, weight loss, thyroid imbalance or some medicines can push many hairs into the resting phase, causing telogen effluvium ¹¹⁶.

Knowing which of these is happening matters, because the outlook and the treatment are very different.

Alopecia areata

Alopecia areata is one of the most common autoimmune causes of hair loss. It can affect people of any age, including children ². Typical features include:

• Smooth, round patches of hair loss on the scalp, beard, eyebrows or elsewhere.
• Short "exclamation mark" hairs at the edges of active patches.
• Sometimes nail changes, such as small pits.
• Unpredictable course: patches may recover on their own, new ones may appear, and a small number of people develop more extensive loss ¹.

Treatment depends on the extent and may include steroid creams or injections, and for more extensive disease, newer medicines such as JAK inhibitors under specialist care ¹². See alopecia areata explained, whether alopecia areata can go away on its own and JAK inhibitors for alopecia areata.

Thyroid disease

The thyroid gland makes hormones that help regulate how fast cells work, including those in hair follicles. Autoimmune conditions are a common cause of both an underactive thyroid (hypothyroidism) and an overactive thyroid (hyperthyroidism) ³⁴.

• An underactive thyroid can cause tiredness, weight gain, feeling cold, dry skin and dry, thinning hair ³.
• An overactive thyroid can cause weight loss, a fast heartbeat, anxiety, heat intolerance and thinning hair ⁴.
• Hair changes are usually diffuse, affecting the whole scalp rather than causing patches.

Once thyroid levels are brought back into the normal range with treatment, shedding often settles, though it can take months for hair to look fuller. See thyroid problems and hair loss.

Why alopecia areata and thyroid disease are linked

Autoimmune conditions tend to cluster, both in individuals and in families. A 2019 meta-analysis of 50 studies found that people with alopecia areata had higher odds of abnormal thyroid function tests, thyroid dysfunction, positive thyroid antibodies and autoimmune thyroid disease than people without it. The authors suggested doctors look out for signs and symptoms of thyroid problems in people with alopecia areata ⁵.

This does not mean everyone with alopecia areata will develop thyroid disease. It does mean it is reasonable to mention symptoms such as tiredness, weight changes, palpitations or feeling unusually hot or cold, and to ask whether a thyroid check is appropriate.

Lupus

Lupus is an autoimmune condition that can affect the skin, joints and internal organs. Common symptoms include joint and muscle pain, extreme tiredness, a facial rash, mouth ulcers, fever and hair loss ¹³. Hair can be affected in several ways ⁶:

• Diffuse non-scarring thinning, often linked with periods of active disease.
• "Lupus hair": short, fragile, broken hairs, often along the front hairline.
• Patchy non-scarring hair loss.
• Scarring patches from discoid lupus, which can appear as red, scaly, sometimes lighter or darker areas with loss of follicle openings ⁷.
• Telogen effluvium caused by the physical stress of illness or by some medicines.

A 2023 review of 237 patients from 27 publications found that diffuse and patchy non-scarring hair loss and lupus hair were strongly linked with systemic disease activity, were likely to respond to lupus treatment and rarely progressed to scarring ⁸. Discoid lupus is different: early treatment matters because scarring can leave lasting bald areas ⁷.

Lichen planopilaris and frontal fibrosing alopecia

These are inflammatory scarring conditions thought to involve the immune system targeting the follicle. Lichen planopilaris may cause redness, scaling and itching or burning around hairs, with gradual patches of loss ⁹. Frontal fibrosing alopecia usually causes a slowly receding hairline and often eyebrow loss, mostly in women after menopause ¹⁴. See scarring alopecia and lichen planopilaris and frontal fibrosing alopecia.

Scarring versus non-scarring hair loss

A doctor can often tell the difference using a magnified view of the scalp, called trichoscopy, and sometimes a small scalp biopsy. See trichoscopy and scalp analysis.

Medicines for autoimmune conditions and hair

Some medicines used to treat autoimmune conditions can themselves be linked with hair shedding, while others help hair by controlling the disease ¹⁵. If you notice more shedding after starting or changing a medicine, tell your doctor. Do not stop a prescribed medicine on your own, as uncontrolled disease can also cause hair loss. See medicines that can cause hair loss.

Tests a doctor may consider

Depending on your symptoms, a doctor may suggest:

• A full blood count and iron studies, since anaemia and low iron are common and can add to shedding.
• Thyroid function tests, and sometimes thyroid antibodies.
• Tests for lupus or other autoimmune conditions if you have symptoms such as joint pain, rashes, mouth ulcers or fever.
• Trichoscopy and, for suspected scarring hair loss, a scalp biopsy.

Tests are chosen based on your history and examination rather than as a standard panel for everyone. See blood tests for hair loss.

Living with an autoimmune condition and hair loss

Hair loss can be distressing, especially when it comes on top of a long-term illness. Some practical points:

• Keep a simple record of shedding, patches and flares, with dated photos.
• Be gentle with hair: avoid tight styles, harsh chemicals and high heat on fragile hair.
• Protect the scalp from the sun, particularly if you have lupus, as sunlight can trigger skin flares ¹³.
• Consider camouflage options, such as hairstyles, scarves, hair fibres or wigs, while treatment takes effect.
• Seek support if hair loss is affecting your mood or confidence. Patient groups and counselling can help.

Preparing for your appointment

Autoimmune conditions often involve more than one part of the body, so complete information helps your doctor see the full picture. Bring:

• A list of all symptoms, including ones that seem unrelated, such as joint pain, rashes after sun exposure or mouth ulcers.
• Family history of thyroid disease, lupus, alopecia areata, type 1 diabetes or vitiligo.
• A list of medicines and supplements, with start dates.
• Dated photos of patches or thinning areas.
• Previous blood test results, if you have them.

Common myths

• "Autoimmune hair loss always means baldness." Many autoimmune causes, including alopecia areata and thyroid-related thinning, are non-scarring and hair can return.
• "If my thyroid is treated, my hair will recover straight away." Hair grows slowly, so improvement can take months.
• "Alopecia areata is caused by stress alone." Stress may be one trigger in some people, but it is an autoimmune condition with genetic factors.
• "Scalp scarring will heal on its own." Scarring alopecia needs prompt assessment because lost follicles may not recover.
• "Supplements can fix autoimmune hair loss." There is no supplement that treats autoimmune disease; correcting a proven deficiency is different.

Common mistakes

• Treating patches at home for months before seeing a doctor.
• Ignoring other symptoms, such as joint pain, rashes or tiredness, that point to an underlying condition.
• Stopping prescribed medicines because of worries about hair.
• Assuming all hair loss is the same and using one product for everything.
• Delaying care for a sore, red or scaly scalp.

Questions to ask your doctor

• Is my hair loss scarring or non-scarring?
• Could this be linked to my thyroid or another autoimmune condition?
• Which tests would be useful in my case?
• Could any of my medicines be contributing?
• What treatment options are suitable, and how long before I might see a change?

The bottom line

Autoimmune conditions can affect hair directly, as in alopecia areata, through inflammation and scarring, as in discoid lupus and lichen planopilaris, or indirectly through thyroid imbalance, illness and medicines. These conditions often cluster, so a doctor may check for related problems such as thyroid disease. Non-scarring hair loss often improves when the underlying condition is controlled, while scarring types need prompt care to limit further loss. If you notice new patches, a sore or inflamed scalp or hair loss alongside other symptoms, see a doctor. For related reading, see alopecia areata explained and thyroid problems and hair loss.

Frequently asked questions

Which autoimmune diseases cause hair loss?

Common examples include alopecia areata, autoimmune thyroid disease, lupus, and inflammatory scarring conditions such as lichen planopilaris and frontal fibrosing alopecia.

Is autoimmune hair loss reversible?

It depends on the type. Non-scarring hair loss, such as alopecia areata or thyroid-related thinning, can recover. Scarring types can leave lasting bald areas, so early treatment aims to prevent further loss.

Is alopecia areata linked to thyroid disease?

Yes. A meta-analysis of 50 studies found thyroid dysfunction and autoimmune thyroid disease were more common in people with alopecia areata. A doctor may check for thyroid symptoms or order tests.

Does lupus cause hair loss?

It can. Lupus may cause diffuse thinning linked to disease activity, short fragile hairs at the front hairline, or scarring patches in discoid lupus. Non-scarring types often improve with lupus treatment.

How can I tell if hair loss is scarring?

Scarring areas often look smooth and shiny with no visible follicle openings and may be itchy, sore or red. A doctor can check with trichoscopy and sometimes a biopsy.

What blood tests are done for autoimmune hair loss?

It depends on symptoms but may include a full blood count, iron studies, thyroid function and antibodies, and tests for lupus if there are other signs. Your doctor chooses the tests based on your history.

Can medicines for autoimmune disease cause hair loss?

Some can be linked with shedding. Tell your doctor if shedding starts after a medicine change, but do not stop treatment on your own because uncontrolled disease can also cause hair loss.

When should I see a doctor?

If you notice new bald patches, a sore, red or scaly scalp, eyebrow loss, or hair loss together with joint pain, rashes, mouth ulcers, fever or tiredness.

Educational content. Not medical advice.