Why is my hair or skin changing? Weight loss injections, stress and hormones explained

Quick answer: Sudden hair shedding is very often a temporary condition called telogen effluvium. It can follow rapid weight loss (including weight loss on GLP-1 injections such as Wegovy or Mounjaro), stress, illness, a high fever or having a baby, and usually shows up two to three months after the trigger. Most people see their hair return to its usual fullness within six to twelve months. Skin can also change with hormones, especially in perimenopause and menopause, when it often becomes drier, thinner and less firm. A qualified hairdresser or skin therapist can help you care for your hair and skin through these changes, and your doctor can help find the cause.

You run your fingers through your hair in the shower and come away with more than usual. Or you look in the mirror one morning and your skin feels tight, dull and somehow different from the face you know.

Changes like these can feel worrying, especially when nobody has told you they might happen. The reassuring news is that many hair and skin changes have a clear reason behind them, and many of them settle with time and good care.

In this guide we explain the most common reasons hair and skin change in adult life, what a beauty professional can do to help, and when it is time to talk to a doctor.

How much hair loss is normal?

Everyone sheds hair every day. The American Academy of Dermatology says losing between 50 and 100 hairs a day is normal, and the NHS gives the same range. Most of the time you don't even notice it.

Each hair grows for a few years, rests, then falls out so a new one can grow in its place. At any one time most of your hairs are growing. When something puts your body under strain, more hairs than usual can switch into the resting stage together. A few months later they all fall at once. This is telogen effluvium, and Alopecia UK notes that people with it may shed up to 300 hairs a day.

It usually looks like hair coming out evenly all over the head, rather than in patches. Your ponytail may feel thinner, or you may find more hair on your pillow, in your brush or in the plughole.

Weight loss injections and hair shedding

GLP-1 medicines such as semaglutide (sold as Ozempic and Wegovy) and tirzepatide (sold as Mounjaro and Zepbound) are now part of everyday life for many people. They are prescribed for type 2 diabetes, weight management and other health reasons. A KFF poll of 1,350 adults in the United States, carried out in late 2025, found that 12% were currently taking one of these medicines and 18% had taken one at some point.

Some people notice extra shedding a few months after starting. A 2026 review of 24 studies in the journal Science Progress brought the evidence together:

• In the main Wegovy trials, 3% of people reported hair loss, compared with 1% of people taking a placebo.
• Across tirzepatide trials for weight management, 5.4% reported hair loss, compared with 0.9% on a placebo.
• In semaglutide trials, hair loss was more common in people who lost more than 20% of their body weight (5.3%) than in people who lost less (2.5%).

The review found that most cases look like telogen effluvium linked to losing weight quickly, rather than damage to the hair follicles. Shedding tends to begin around two to three months after starting a medicine or raising the dose, and generally improves within three to six months once weight settles.

So the important message is a kind one. If you are taking one of these medicines and your hair is shedding, it is common, it is usually temporary, and it is worth mentioning to your prescriber. Please don't stop or change your medicine without talking to them first.

Stress, illness and having a baby

Weight loss is only one of many triggers. The American Academy of Dermatology lists losing 20 pounds (about 9 kg) or more, giving birth, high stress, a high fever, surgery, recovering from an illness and stopping the contraceptive pill as common causes of excessive shedding.

After having a baby, shedding often starts around two months after the birth and usually peaks at about four months. It can feel dramatic, but it is very common and hair generally recovers in time.

Sometimes there is no clear reason at all. Patient.info, a UK medical information site, notes that as many as 1 in 3 cases of telogen effluvium have no obvious cause. Low iron, thyroid changes and some medicines can also play a part, which is why a doctor is the best person to look into the cause.

The good news is that this kind of shedding is usually temporary. The American Academy of Dermatology says hair tends to regain its usual fullness within six to nine months as your body readjusts. Hair grows about 1 cm a month, so it takes a little patience before you see the difference.

Perimenopause, menopause and your skin

Hormones shape our skin all through life, and the years around menopause bring some of the biggest changes. According to the American Academy of Dermatology, skin loses about 30% of its collagen in the first five years of menopause, then roughly 2% a year for the next 20 years. Collagen helps keep skin plump and firm, so many people notice:

• Drier skin that feels tight or itchy
• Thinner skin that bruises more easily
• Lines, wrinkles and less firmness around the jaw
• Breakouts, even if you haven't had spots for years
• More sensitivity, redness or irritation
• Thinning hair on the head, or new hairs on the chin or upper lip

If this is happening to you, you are far from alone. A survey of more than 4,300 people in nine countries going through perimenopause and menopause, presented by skincare company Galderma in 2026, found people noticed an average of three skin changes. 57% said these changes made them feel anxious, 60% felt less attractive and 55% felt less confident. More than half said they only learned about these changes as they happened, most often in their 40s.

Knowing what to expect makes such a difference. We wrote more about looking after yourself through this stage in Let's celebrate menopause: mindset, mindfulness and thriving in midlife.

How a salon professional can help

A qualified hairdresser, barber or skin therapist sees your hair and skin up close, often every few weeks. That makes them a lovely source of support and practical care. They can't diagnose a medical condition, but they can help you feel and look more like yourself while your body settles.

For hair that is shedding or thinning, a hairdresser can:

• Suggest a cut that gives more body and movement, so hair looks fuller
• Handle your hair gently, with less tension, heat and pulling
• Recommend styles that avoid tight ponytails, braids and extensions while hair recovers
• Offer relaxing scalp treatments and scalp massage, which many people find soothing
• Adjust colour plans so your hair and scalp are treated kindly
• Keep an eye on changes between visits and let you know if something is worth checking

For skin that is changing, a skin therapist can:

• Offer a hydrating facial tailored to drier or more sensitive skin
• Help you build a simple routine with a gentle cleanser, a good moisturiser and daily sunscreen
• Suggest products that support the skin barrier, such as those with glycerin or hyaluronic acid
• Adapt treatments if your skin has become thinner or more reactive
• Notice anything unusual, such as a changing mole, and encourage you to get it checked

It really helps to tell your professional about any new medicines, health changes, pregnancy or menopause symptoms on your consultation form. It isn't about judging. It simply helps them choose treatments and products that suit you today.

When to see a doctor, dermatologist or trichologist

Your GP or family doctor is the best first step, because they can check for things like low iron or thyroid changes. The NHS suggests seeing a GP before visiting a commercial hair clinic, so the cause can be looked at first. A dermatologist is a doctor who specialises in skin, hair and nails. A trichologist specialises in hair and scalp health and can be helpful alongside your doctor.

It is worth booking an appointment if you notice:

• Heavy shedding that carries on for more than six months
• Bald patches, a widening parting or a receding hairline
• An itchy, sore, red or flaky scalp
• Hair loss along with tiredness, feeling cold or other symptoms
• A rash, a sore that won't heal or a mole that changes
• Skin or hair changes that are affecting how you feel day to day

If you're pregnant, have recently had a baby or are taking a prescribed medicine, your doctor, midwife or prescriber can talk you through what is normal for you.

FAQs

Do weight loss injections make your hair fall out?

Some people notice extra shedding, usually two to three months after starting or increasing the dose. Trials show it affects a small share of people, and it is more common with faster, larger weight loss. It is usually temporary telogen effluvium. Speak to your prescriber before making any change to your medicine.

Will my hair grow back after telogen effluvium?

In most cases, yes. Once the trigger has passed, hair usually returns to its usual fullness within six to twelve months. Because hair grows about 1 cm a month, it can take a little while before you notice the difference.

How do I know if my hair loss is normal?

Losing 50 to 100 hairs a day is normal. If you are losing much more than that, see patches, or the shedding goes on for longer than six months, talk to your doctor.

Why has my skin become so dry in my 40s?

Falling hormone levels in perimenopause and menopause reduce collagen and moisture in the skin. A gentle cleanser, a rich moisturiser, daily sunscreen and a hydrating facial can all help. See your doctor or a dermatologist if dryness is itchy, sore or not improving.

Should I tell my hairdresser or therapist about my medication?

Yes, if you are comfortable to. Medicines and health changes can affect how hair and skin respond to treatments, so sharing helps your professional look after you well. Everything you share should be kept private.

Find support near you

Hair and skin changes are part of life, and you don't have to work them out alone. A caring, qualified professional can help you look after your hair and skin gently while your body settles.

Explore our facial treatment guide to see what to expect, then find a verified professional near you. Every verified profile on The Hair and Beauty Directory has had its qualifications and insurance checked, so you can book with confidence.