The Top Causes of Hair Fall in Summer — and How to Combat Them

Every year, somewhere around June, the same thing happens across Dubai: the brush fills up faster, the shower drain needs clearing more often, and an ordinary morning ends with a small knot of hair in your hand.

Seasonal shedding is a documented pattern, not a sign something has gone wrong. But a UAE summer stacks extra causes on top of it. Here is what is actually driving each one, what the evidence supports, and what is worth changing.

• Summer shedding is real: trichogram data from 823 women showed the proportion of resting-phase hairs peaks in summer and bottoms out in late winter.
• Most of what you see in the brush in August is breakage, not shedding — a materials problem you can influence, rather than a follicle one you mostly cannot.
• The biggest summer change is invisible: you wash more, so hot, chlorinated, hard tap water meets your hair far more often.
• No shower filter stops hair fall, and none softens water. What one does is reduce chlorine and metal traces in the water you wash in daily.
• Shedding that stays heavy past a few months, or comes with visible thinning at the parting, needs a doctor, not a new conditioner.

Is summer shedding real?

Yes — hair shedding follows an annual rhythm, and it peaks in summer. Researchers at the University Hospital of Zürich reviewed six years of records from women who came in complaining of hair loss and, after excluding everyone with a disease or drug known to cause it, analysed trichograms from the 823 who remained. The pattern was clear: the proportion of hairs in the telogen (resting, about-to-shed) phase was highest in summer and lowest in late winter, with a smaller second peak in spring.

Two honest caveats. That research was done in Switzerland, so it captures the underlying seasonal rhythm rather than anything specific to the Gulf. And it studied women who had come to a clinic about hair loss, not a general population. A seasonal peak is temporary; progressive thinning is not the same thing.

What a UAE summer adds on top

1. More sweat means more washing

This is the quiet one, and in Dubai it matters most. Sebum production is temperature-sensitive: classic research in the British Journal of Dermatology found that heating and cooling the skin changed the sebum excretion rate on the order of 10% for every 1 °C change in local skin temperature. Add a Dubai August and a gym session, and the scalp is simply oilier than in January.

So people wash more often — and every extra wash is another round of exposure to hot, chlorinated, hard tap water. The evidence on hard water and hair is genuinely mixed: a 2013 study found no significant effect on tensile strength, while a larger 2018 study in the International Journal of Trichology found mean tensile strength fell from 255.49 in controls to 234.16 after hard-water treatment and concluded hard water increases breakage. What both camps agree on is deposition — scanning electron microscopy shows hard-water-treated hair carries much more calcium and magnesium and has a visibly ruffled surface. Rougher strands tangle more, tangles get pulled, and pulled hair breaks.

2. Sun and UV

UV degrades hair as a material, but be precise about how. A study in the Journal of Photochemistry and Photobiology B irradiated dark-brown, blonde, red and black hair and found a substantial increase in protein loss in water after exposure, with UVB roughly two to five times more damaging than UVA plus visible light, and significant colour changes across every hair type — most pronounced in light hair.

What that study did not find is worth stating: no significant changes in the hair's mechanical properties or surface topography in any of the conditions tested. So treat sun as a colour-and-protein problem rather than proof that UV snaps your hair. And your scalp is skin — an exposed parting burns like any other patch of it.

3. Pool and beach days

Pool water is chlorinated far more heavily than tap water, deliberately. CDC guidance is that free chlorine should be at least 1 ppm in pools and at least 3 ppm in hot tubs, while the World Health Organization notes drinking water typically carries 0.2–1 mg/L. Then there is exposure time: a shower is minutes, an afternoon at the pool is hours. Chlorine is an oxidising agent, so it strips protective oils and lifts the cuticle, leaving hair dry and easier to break.

4. Humidity, tangles and handling

Gulf humidity keeps the cuticle swollen and raised, which is why hair frizzes and knots from July onwards. Add the mineral roughness above and hair tangles at every step — so people brush harder and towel-dry more aggressively. That daily friction is a real source of breakage, and it is entirely within your control.

5. What is happening on the inside

Summer routines quietly disrupt diet: appetite drops in the heat, meals get skipped, hydration slips. Research in the Journal of Investigative Dermatology found mean serum ferritin — the marker of the body's iron stores — was significantly lower in women with androgenetic alopecia and alopecia areata than in women without hair loss, though not in those with telogen effluvium. Iron is not the whole story and the evidence is still debated, but if you are shedding heavily, this is something a doctor can check with a blood test rather than something to guess at with supplements.

The drivers, ranked by what you can change

Driver	Shedding or breakage?	How much you control it	What helps
Seasonal telogen peak	Shedding	None	Patience; a doctor if it persists
Hot, chlorinated, hard wash water	Breakage	High	Cooler washes; a shower filter for chlorine and metals
Brushing, towelling, tight styles	Breakage	Highest	Detangle gently, loose styles, never tie wet hair tightly
Pool and sea exposure	Breakage	High	Pre-wet with clean water, rinse immediately after
UV	Colour and protein loss	Moderate	Cover the parting; protective styles
Iron, protein, illness, hormones	Shedding	Via a doctor	Blood work, not supplements bought on a hunch

The summer routine that actually helps

Rinse early and often — this is the highest-return habit of the season. Cleveland Clinic dermatologists advise wetting your hair with clean water before you get into a pool, so it absorbs less pool water, then showering with a gentle cleanser immediately afterwards. The same applies after the gym.

Style protectively, but loosely. Getting hair up and off a hot neck protects it from sun, sweat and friction. The catch is tension: the American Academy of Dermatology is clear that hairstyles which pull can lead to traction alopecia, and that this can become permanent the longer it goes untreated. Keep it loose, wear braids no longer than six to eight weeks, switch styles regularly, and never pull hair tightly back while wet.

Deep-condition weekly, on the mid-lengths and ends — the oldest, most weathered part of every strand — rather than the roots. A conditioner that sits for ninety seconds cannot undo what the season is doing daily.

And adjust the shower itself: wash lukewarm rather than hot, with a gentle shampoo concentrated on the scalp rather than the lengths.

Fix the water your hair meets every day

Sun exposure is seasonal and pool days are occasional, but your shower happens every day — twice a day for many people in summer. That makes the water the most repeated variable on the list, and the easiest to change permanently.

The word that matters is certified: NSF notes there are no federal regulations governing residential shower filters in the US, so certification is what separates a claim from a promise. NSF/ANSI 177 is the shower-specific standard and its scope is verified reduction of aesthetic free available chlorine; NSF/ANSI 42 is the broader drinking-water aesthetic-effects standard covering chlorine, chloramine, taste, odour and particulate.

blu's Ionic Shower Filter is built on an NSF/ANSI 42 certified filtration medium — that certifies the Nano Molecular Cluster medium itself, not the finished product or the company. The cartridge reduces chlorine, heavy metal ions, dirt and odours rather than eliminating them. Eurofins test reports on the cartridge show free chlorine reduced from 17.09 mg/L to 0.09 mg/L (a 99.5% reduction), and the filter was named Best Overall in Gulf News' March 2024 UAE shower-filter roundup; how the medium works is on The Science page.

Two honest limits. No shower filter softens water — nothing in a cartridge reduces the calcium and magnesium that make Dubai's water hard; that takes ion-exchange resin, which is what the separate NXT LVL Shower Softener & Filter uses. And no filter stops hair loss. What it does is reduce one repeated stressor in a summer that has quite enough of them.

When to see a doctor

Book an appointment if shedding stays heavy for more than a few months, if you can see scalp through your hair at the parting or temples, if your scalp is painful, itchy or inflamed, or if hair fall arrives with fatigue, weight change or other symptoms. Those patterns point at causes — thyroid, iron, hormones, illness, medication, traction — that no shower product addresses, and the earlier they are identified the better the outcome tends to be.

Frequently asked questions

Sources

• Kunz M, Seifert B, Trüeb RM. "Seasonality of hair shedding in healthy women complaining of hair loss." Dermatology 2009;219(2):105–10 — PubMed 19407435
• Cunliffe WJ, Burton JL, Shuster S. "The effect of local temperature variations on the sebum excretion rate." British Journal of Dermatology 1970;83(6):650–4 — PubMed 4250118
• Luqman MW, Ramzan MH, Javaid U, et al. "To Evaluate and Compare Changes in Baseline Strength of Hairs after Treating them with Deionized Water and Hard Water." International Journal of Trichology 2018;10(3):113–7 — PubMed 30034190
• Srinivasan G, Srinivas CR, Mathew AC, Duraiswami D. "Effects of hard water on hair." International Journal of Trichology 2013;5(3):137–9 — found no significant effect on tensile strength — PubMed 24574692
• Srinivasan G, Chakravarthy Rangachari S. "Scanning electron microscopy of hair treated in hard water." International Journal of Dermatology 2016;55(6):e344–6 — PubMed 26711619
• Santos Nogueira AC, Joekes I. "Hair color changes and protein damage caused by ultraviolet radiation." Journal of Photochemistry and Photobiology B 2004;74(2–3):109–17 — PubMed 15157906
• Kantor J, Kessler LJ, Brooks DG, Cotsarelis G. "Decreased serum ferritin is associated with alopecia in women." Journal of Investigative Dermatology 2003;121(5):985–8 — PubMed 14708596
• CDC pool and hot tub chlorine guidance, as restated by the Arkansas Department of Health, "Safe & Healthy Swimming" — healthy.arkansas.gov
• World Health Organization, Chlorine in Drinking-water chemical fact sheet — who.int
• Cleveland Clinic newsroom, "Does pool water affect your skin and hair?" — clevelandclinic.org
• American Academy of Dermatology, "Hairstyles that pull can lead to hair loss" — aad.org
• NSF, "NSF/ANSI 177 – Shower Filter Certification" — nsf.org
• NSF knowledge library, "Filtration Systems Standards" (scope of NSF/ANSI 42) — nsf.org
• Eurofins, test report EFSN24031276 — free chlorine reduction on the blu Nano Molecular Cluster cartridge, 3 April 2024 — Eurofins report EFSN24031276 (PDF)
• blu, The Science and Results — medium, certification and laboratory characterisation, retrieved 1 September 2026.

This article is general information, not medical advice. Persistent or heavy hair fall should be assessed by a doctor or dermatologist.