Medically reviewed by Dr. Levent Acar, MD
Founder & Lead Hair Transplant Surgeon
Updated on: October 29, 2026
Yes, diabetes can contribute to hair loss, but it’s rarely the only factor. Blood sugar, circulation, the immune system and the general strain of living with a chronic condition can all affect your hair. Other causes, such as thyroid problems, hormonal changes or inherited thinning, often overlap with these.
This guide explains how diabetes can affect hair, which other causes are worth ruling out, and how to tell temporary shedding from longer-term loss. It also covers what may help and whether a hair transplant is ever an option for people with diabetes.
How Diabetes Can Lead to Hair Loss
High blood sugar and the hair growth cycle
Each hair follicle goes through a repeating cycle. During the anagen (growth) phase, a hair grows steadily, often for several years. In the telogen (resting) phase, the hair stops growing, then sheds, and a new hair usually starts in its place.
Researchers are still working out exactly how diabetes affects this cycle. In animal research, type 2 diabetes slowed the activation of hair follicle stem cells, the cells that drive new growth. This may help explain why some people with diabetes notice thinner hair or slower regrowth, although evidence in humans is more limited.
Damaged blood vessels and reduced follicle supply
Hair follicles need a steady supply of oxygen and nutrients. Over time, diabetes can contribute to narrowed arteries, which reduces blood flow, especially to the legs.
The NHS lists hair loss on the legs and feet as a possible symptom of peripheral arterial disease, alongside leg pain when walking and slow-healing sores. Diabetes is one of the underlying causes. If you notice sparse leg hair, mention it to your GP or diabetes team.
The immune system and alopecia areata
Alopecia areata is an autoimmune condition. The immune system attacks hair follicles, usually causing round, patchy bald spots. High blood sugar does not cause it.
People with alopecia areata often have other autoimmune conditions, but the evidence for a direct link with type 1 diabetes is mixed. One study found that alopecia areata was linked with autoimmune thyroid disease rather than the autoimmunity behind type 1 diabetes. Either way, sudden patchy hair loss should be assessed by a dermatologist.
Stress on the body
A new diagnosis, a period of illness, a hospital stay or big swings in blood sugar can put the body under strain. This can push many follicles into the resting phase at once, and shedding often follows a couple of months later. This is called telogen effluvium.
This kind of shedding is usually temporary, and hair typically grows back once the trigger settles.
Type 1 vs Type 2 Diabetes: Is There a Difference?
Both types can affect hair through blood sugar, circulation and stress on the body. The main difference is what tends to overlap with each:
- Type 1 diabetes is autoimmune, so other autoimmune conditions that can affect hair, such as thyroid disease and alopecia areata, are worth keeping in mind.
- Type 2 diabetes is closely tied to insulin resistance and metabolic health, which may connect it to hormonal conditions and pattern hair loss.
Neither type always causes hair loss, and many people with diabetes never notice any change.
Other Causes That Often Overlap
- Hormonal imbalances. Both an underactive and an overactive thyroid can cause thinning hair. In women, PCOS (now also called PMOS) can cause hair loss and is linked to insulin resistance and type 2 diabetes. For women weighing longer-term options, see hair transplant options for women.
- Androgenetic alopecia. Pattern hair loss is common in both men and women. A meta-analysis found that people with androgenetic alopecia were more likely to have metabolic syndrome, which includes raised blood sugar, though research is still developing. This type of loss is usually inherited and gradual, and it doesn’t reverse when blood sugar improves.
- Medication and nutrients. The UK medicines regulator says low vitamin B12 is a common side effect of metformin, especially at higher doses or with long-term use. A 2026 study also found that GLP-1 medicines were linked to a slightly higher risk of hair loss in people with type 2 diabetes than some other diabetes treatments, although the absolute risk was low. Low iron can also play a part; see our guide to how anemia can affect your hair. Never stop or change diabetes medication without speaking to your doctor.
Will Hair Grow Back?
It depends on the cause.
| Likely temporary shedding | Likely progressive or a different cause | |
|---|---|---|
| What it looks like | Diffuse thinning across the whole scalp | Receding hairline, widening parting, crown thinning, or round bald patches |
| When it started | A few months after illness, stress or a period of poor blood sugar control | Gradually, often over months or years |
| How it changes | Improves once your health stabilises | Keeps getting worse, or patches appear suddenly |
| Family history | Not usually relevant | Often similar hair loss in the family |
| Common causes | Telogen effluvium, blood sugar swings, low iron or B12 | Androgenetic alopecia, alopecia areata |
Temporary shedding often grows back. Pattern loss usually continues unless it’s treated, and round patches should be checked by a dermatologist.
Managing Diabetes and Hair Loss Treatments That May Help
Managing your diabetes well is the foundation. Keeping blood sugar within your target range supports circulation, healing and the hair growth cycle. Your doctor may suggest blood tests for thyroid function, iron, B12 or vitamin D to look for other contributors.
Some simple habits can also help:
- Wash and brush gently.
- Avoid tight hairstyles.
- Limit heat styling and harsh chemical treatments while your hair is shedding.
For ongoing thinning, your doctor or a dermatologist can discuss medical hair loss treatments that suit your health and current medicines. Be wary of supplements, oils or serums that claim to stimulate hair growth for people with diabetes. There’s little good evidence for most of them, and supplements are only likely to help if you actually have a deficiency.
Can You Get a Hair Transplant if You Have Diabetes?
Sometimes, yes, but it depends on the person. A hair transplant moves follicles from a stable donor area to thinning areas. It can be an option for established, patterned loss such as androgenetic alopecia. It doesn’t treat diffuse, diabetes-related shedding, and it isn’t a fix for active alopecia areata.
Whether a transplant is suitable depends on:
- how well your diabetes is controlled
- how well you heal
- the quality of your donor area
- your overall health
- clearance from your own doctor
At Cosmedica, every plan starts with a consultation that reviews your hair loss pattern, donor area and medical history, including diabetes, before any treatment is recommended. You can learn more about hair transplant in Turkey and who it may suit.
Results vary from person to person. Hair transplant before and after examples give a realistic picture of what treating pattern loss can look like. If you’re weighing up treatment abroad, the Turkey hair transplant cost page explains what each package includes.
When to See a Doctor
See your GP or diabetes team if you notice any of the following:
- Sudden or heavy shedding
- Round bald patches
- Hair loss with fatigue, weight changes or feeling cold, which can be signs of a thyroid problem
- Loss of hair on your legs or feet, with slow-healing wounds or numbness
- Shedding after starting a new medication
Next Steps
If your hair loss has continued even with stable blood sugar and clear blood tests, it may be a separate, pattern-type loss. The same applies if you’re seeing a receding hairline or thinning at the crown. A free hair analysis can help clarify the pattern and your options.
FAQ
Is hair loss from diabetes permanent?
Not usually. Shedding linked to stress, illness or poor blood sugar control often improves once things settle. Loss from an overlapping cause, such as pattern hair loss, may continue and needs a separate assessment.
Can metformin cause hair loss?
Hair loss isn’t a well-established direct side effect. However, low vitamin B12 is a common side effect of long-term metformin use, and low B12 can play a part in shedding. Speak to your doctor before making any changes.
Why am I losing hair on my legs with diabetes?
Thinning hair on the lower legs can sometimes be a sign of reduced circulation. Mention it to your GP or diabetes team so they can check.
Will controlling my blood sugar make my hair grow back?
It may help if blood sugar was part of the problem, because the growth cycle can recover over the following months. It won’t reverse inherited pattern loss.