How do hormones affect hair growth?
Hormones called androgens stimulate hair follicles and can cause thick, dark hair on the face and body. In some people hormone levels are normal but the follicles are sensitive to them.
Excess hair in a male-pattern distribution is called hirsutism. Polycystic ovary syndrome is among the most common causes, but thyroid, adrenal or pituitary conditions and some medicines can also increase hair growth.
Hair growth can be the sole sign, or it can come with irregular periods, acne, hair thinning on the scalp and weight gain. When such signs are present, medical assessment before laser is sensible.
Why can laser fall short in hormone-related hair growth?
Laser weakens existing follicles, but while the hormonal stimulus continues, follicles that had not yet produced hair can be activated and new hairs can appear.
This does not mean laser has failed; because the tendency continues, keeping the result may need maintenance sessions. If the hormonal imbalance is treated, the reduction from laser may be better maintained.
Some people have many fine, pale hairs that respond less well to laser. Expectations should be discussed realistically after the hair is examined.
What should be assessed before laser?
The first step in excess hair growth is finding the cause. History, examination and, where needed, hormone tests are requested by an endocrinologist or gynaecologist.
Hair growth that starts quickly, a deepening voice, marked menstrual disturbance or a new increase in muscle mass can point to more serious causes and need specialist review without delay.
When the hormonal cause can be managed with medication, the doctor treating it plans that; the choice of medicine and its amount is a decision for that specialist, not the laser practitioner. Laser is considered as a method that supports this care.
How is a laser plan made for hormonal hair growth?
The plan depends on hair structure, area and skin tone, and sessions often proceed patiently at intervals. Maintenance sessions and follow-up of the hormonal condition may be needed to keep results.
New hair may be seen more often in hormone-sensitive areas such as the face and neck. In these areas intervals may be kept shorter and follow-up more frequent.
Basic preparation and intervals are described on the laser hair removal page. Knowing your hormonal situation and sharing it with the practitioner helps keep the plan realistic.
When should I see a doctor?
If hair growth is new, increasing quickly or comes with irregular periods or a deepening voice, see a doctor before laser. These signs can point to an underlying health problem.
For people planning a pregnancy, drug treatment and the timing of laser need particular care and should be discussed with the treating doctor.
Cosmetic hair reduction does not replace finding the medical cause. Once that is established, laser can be planned with the doctor’s input.
Frequently asked questions
Can I have laser hair removal if I have PCOS?
Usually yes, but because hair can return under hormonal stimulation, maintenance sessions may be needed. The doctor assesses suitability at consultation and may advise endocrine follow-up.
Does laser regulate hormones?
No. Laser acts on hair follicles and does not change hormone levels. Hormonal problems need assessment by the relevant specialist.
Can laser be done during hormone treatment?
Usually yes, but the medicines you take must be reported to the doctor, as some can increase light sensitivity. A decision together with the treating doctor is appropriate.
Why does some hair come back after laser?
Not every follicle is affected at once, and hormonal stimulus can activate new follicles. Sessions or maintenance sessions may then be repeated.
Can hair grow thicker after laser?
Rarely, increased hair growth has been reported, mostly on the face and neck and in darker skin. It should be reported to the doctor and the plan reviewed.
Sources (4)
- Endocrine Society (Journal of Clinical Endocrinology & Metabolism): Evaluation and Treatment of Hirsutism in Premenopausal Women: An Endocrine Society Clinical Practice Guideline (2018)
- American Academy of Dermatology: Laser hair removal: Overview
- British Journal of Dermatology: A randomized controlled trial of laser treatment among hirsute women with polycystic ovary syndrome (2005)
- Cureus: Impact of Laser Therapy on the Quality of Life in Women Living With Polycystic Ovary Syndrome-Associated Hirsutism: An Observational Study (2024)
This content is for general information and does not replace a personal medical assessment.