How stress affects the skin: acne, hair loss, rosacea and psoriasis

Stress affects the skin through the neuro-cutaneous axis: skin and nervous system share an embryonic origin and communicate constantly. Under stress, the body releases cortisol, adrenaline and neuropeptides that increase inflammation, weaken the skin barrier and dysregulate the immune response. In practice this means worsening acne, rosacea, psoriasis, eczema and urticaria, and it can trigger hair loss three months after the event. This is not perception: it is a documented physiological mechanism.

How does stress reach the skin?

Skin and nervous system form from the same embryonic layer, the ectoderm. That shared origin is not merely a curiosity: it explains why they stay connected for life.

Under stress, the hypothalamic-pituitary-adrenal axis activates. Cortisol and catecholamines are released. Nerve endings in the skin release neuropeptides such as substance P, which activate mast cells and trigger local inflammation.

The result has three practical consequences: inflammation rises, the skin barrier weakens — the skin loses more water and becomes more reactive — and the immune response changes, delaying healing and favouring infection.

Does stress cause acne?

It does not cause acne in someone without a predisposition, but it clearly worsens it in those who have one.

Cortisol stimulates sebum production and amplifies inflammation around the follicle. This is why acne flares during exam periods, work overload or bereavement.

There is also an indirect and very common mechanism: stress increases picking at lesions. A large share of the marks left behind do not come from the acne, they come from the hands.

Does stress cause hair loss?

Yes, and it is one of the most recognisable manifestations — but with a delay that misleads almost everyone.

In telogen effluvium, a physical or emotional shock pushes a large number of follicles into the shedding phase at once. Visible hair loss appears two to three months after the event, by which time the person is often better and does not make the connection.

It is typically reversible: hair grows back within six to nine months once the cause is resolved. Other causes of shedding should still be ruled out — low iron, thyroid disorders, deficiencies — because they frequently overlap.

Stress is also a recognised trigger of alopecia areata, where the immune system attacks the follicle and causes well-defined circular patches.

Does stress cause rosacea?

It does not cause it. It triggers flares in those who already have it.

Stress causes facial vasodilation — the flush that appears in a difficult meeting or an argument. In skin with rosacea, that mechanism is already dysregulated, and the episode lingers instead of passing.

In patient surveys, stress consistently ranks among the three most cited triggers, alongside sun and heat.

What about psoriasis and eczema?

These are the two conditions where the link is best documented.

In psoriasis, stress precedes the appearance or worsening of lesions in a significant proportion of patients. And one finding closes the circle: several of the inflammatory cytokines involved in psoriasis are the same ones found elevated in depression. Not a coincidence — overlapping pathways.

In atopic dermatitis, stress worsens itching, and itching worsens stress. The scratch-inflame-scratch cycle sets in, and it has to be broken at two points at once.

There is also urticaria, where stress is a recognised trigger of acute episodes, and chronic forms in which the emotional component is relevant.

Does stress age the skin?

Yes, through three mechanisms.

Cortisol degrades collagen and reduces its production. Oxidative stress increases free radicals and accelerates cellular ageing. And sleep, which almost always deteriorates, is when the skin repairs itself — less sleep means less repair.

On top of that, in stressful periods the skincare routine is usually the first thing to go.

What to do, in practice

On the skin: keep the routine simple even in bad periods. Gentle cleansing, moisturiser and sunscreen. This is not the moment to introduce new or aggressive actives — the barrier is already compromised.

On sleep: this is the intervention with the best return. Seven to nine hours, on a regular schedule.

On exercise: regular physical activity lowers cortisol and improves systemic inflammation. In people with rosacea, moderate intensity is preferable, as very intense exercise can trigger a flare.

On the hands: identifying the picking habit and replacing it. It is the most underestimated measure and one of those that most changes the outcome.

None of these replaces dermatological treatment when there is active disease. They make the difference between controlling it well and controlling it badly.

When to seek help?

• When a skin condition worsens in the same periods every time

• When there has been diffuse hair loss for more than three months

• When you cannot stop picking or scratching

• When the skin is affecting mood, sleep or social life

• When the correct dermatological treatment is not working as expected

The last point deserves a note. When an appropriate treatment is not working as it should, it is worth looking at what surrounds it. Often it is not the treatment that is failing.

Sources

• Marek-Jozefowicz L, et al. The Brain-Skin Axis in Psoriasis — Psychological, Psychiatric, Hormonal, and Dermatological Aspects. Int J Mol Sci. 2022;23(2):669. doi:10.3390/ijms23020669

• American Academy of Dermatology — stress and skin conditions

• European Academy of Dermatology and Venereology

• Portuguese Society of Dermatology and Venereology (SPDV)

Written and reviewed by Dr Ellene Papazis, dermatologist accredited in Portugal and Brazil. Consultations in Porto, Portugal.

Updated 25 July 2026.