Noticing more hair than usual in your hairbrush, shower or on your pillow can be worrying. Whether you’re experiencing gradual thinning, a receding hairline or sudden hair shedding, understanding what might be causing it is the first step towards finding the right solution.
Hair loss affects both men and women and can happen for many reasons, including genetics, hormonal changes, stress, nutritional deficiencies and certain medical conditions.
According to the NHS, it’s normal to lose around 50 to 100 hairs each day. However, if you’re noticing significantly more shedding, bald patches or changes in your hair’s thickness, it may be worth investigating further.
The good news is that some types of hair loss are temporary, and treatments are available for certain conditions. However, the most effective approach depends on identifying the underlying cause.
In this guide, we’ll explore the most common reasons for hair loss, the signs to look out for and the treatment options that may help.
Hereditary Hair Loss (Androgenetic Alopecia)
One of the most common causes of hair loss is genetics. Known medically as androgenetic alopecia, hereditary hair loss can affect both men and women, although the patterns of thinning often differ.
In men, hereditary hair loss typically begins with a receding hairline or thinning around the crown. Over time, these areas may become more noticeable, sometimes leading to partial or extensive baldness.
Women are more likely to experience gradual thinning across the top of the scalp, often noticing that their parting appears wider or their hair feels less full than it once did.
A hormone called dihydrotestosterone (DHT), which is produced from testosterone, plays an important role in hereditary hair loss. In people who are genetically susceptible, DHT can cause hair follicles to gradually shrink, producing finer and shorter hairs.
Although hereditary hair loss tends to develop gradually, treatments such as minoxidil and, for suitable men, prescription finasteride may help slow its progression. Results vary, and treatment generally needs to continue to maintain its benefits.
If you’re concerned about changes in your hairline or hair density, speaking to your GP or a dermatologist can help you understand your options.
Hormonal Changes and Hair Loss
Hormonal changes can contribute to hair thinning and excessive shedding in both men and women. Conditions such as an underactive or overactive thyroid can disrupt the normal hair growth cycle, sometimes resulting in noticeable hair loss.
Other hormonal factors, including changes associated with pregnancy, menopause and certain medical conditions, may also affect hair growth.
Because hair thinning can have several underlying causes, identifying what is contributing to the problem is an important step before choosing a treatment. People experiencing ongoing shedding or changes in hair density may benefit from professional support for thinning hair, including a personalised assessment of their scalp and hair health.
A GP can also investigate potential underlying causes, such as thyroid problems or nutritional deficiencies, and recommend appropriate treatment or further testing.
Medical Conditions and Nutritional Deficiencies
Hair loss isn’t always caused by genetics or stress. Sometimes, thinning hair or excessive shedding can be a sign of an underlying medical condition or nutritional deficiency.
Identifying the cause is particularly important because treating the underlying problem may help improve hair growth.
Iron Deficiency and Anaemia
Iron plays an important role in maintaining healthy hair growth. Low iron levels, particularly when associated with iron deficiency anaemia, can contribute to increased hair shedding.
Women who experience heavy periods may be more susceptible to iron deficiency, although it can affect anyone.
If you suspect your iron levels are low, your GP can arrange blood tests to investigate. Avoid taking high-dose iron supplements without medical advice, as excessive iron can be harmful.
Thyroid Disorders
Both an underactive thyroid (hypothyroidism) and an overactive thyroid (hyperthyroidism) can affect the hair growth cycle.
Thyroid-related hair loss often causes general thinning rather than distinct bald patches. Other symptoms may include tiredness, unexplained weight changes and changes in sensitivity to temperature.
Treating the thyroid condition can help improve hair growth, although recovery may take several months.
Alopecia Areata
Alopecia areata is an autoimmune condition in which the immune system mistakenly attacks hair follicles.
It commonly causes smooth, round or oval patches of hair loss on the scalp, although eyebrows, eyelashes and other body hair can also be affected.
Hair may regrow naturally in some cases, but the condition can be unpredictable. A dermatologist can discuss available treatment options.
Scalp Conditions and Infections
Certain scalp conditions can interfere with healthy hair growth.
For example, fungal infections such as scalp ringworm can cause patches of hair loss, sometimes accompanied by itching, scaling or inflammation.
Other inflammatory scalp conditions may also contribute to hair thinning. Some can cause permanent hair loss if left untreated, making early diagnosis particularly important.
Nutritional Deficiencies
A balanced diet provides the nutrients needed to support normal hair growth.
Deficiencies in nutrients such as protein, iron and zinc can sometimes contribute to hair loss. However, taking additional vitamins or supplements won’t necessarily improve hair growth unless a deficiency is present.
Restrictive diets, rapid weight loss and inadequate calorie intake can also trigger excessive shedding.
Hair-Pulling Disorder (Trichotillomania)
Trichotillomania is a mental health condition characterised by recurrent urges to pull out hair.
It can result in noticeable thinning or irregular patches of hair loss.
Treatment may involve psychological therapies, including cognitive behavioural therapy (CBT), particularly a technique known as habit reversal training.
When Should You See Your GP?
Although some hair loss is temporary, it’s worth seeking medical advice if you experience sudden or unexplained shedding, bald patches, scalp pain or inflammation, or hair loss accompanied by other symptoms.
Your GP can assess your symptoms, consider whether blood tests are appropriate and refer you to a dermatologist if necessary.
Stress and Hair Loss (Telogen Effluvium)
Have you ever noticed your hair shedding more than usual after a particularly stressful period? Physical and emotional stress can sometimes disrupt the normal hair growth cycle, leading to a condition known as telogen effluvium.
Unlike hereditary hair loss, which typically develops gradually, telogen effluvium often causes increased shedding across the scalp.
Common triggers include:
- Significant emotional stress or anxiety.
- Illnesses accompanied by a high temperature.
- Major surgery or physical trauma.
- Rapid weight loss or restrictive dieting.
- Childbirth and hormonal changes.
- Certain medications.
Interestingly, hair shedding doesn’t always happen immediately after a stressful event. It often becomes noticeable around two to three months later, making it difficult to connect the hair loss with its original cause.
The reassuring news is that telogen effluvium is usually temporary. Once the underlying trigger has resolved, excessive shedding often improves within three to six months, although regaining your previous hair density can take considerably longer.
However, persistent or unexplained hair loss shouldn’t automatically be attributed to stress. If you’re experiencing ongoing shedding, bald patches or other symptoms, speak to your GP to rule out nutritional deficiencies, thyroid conditions or other medical causes.
Hair Loss Treatments: What Are Your Options?
If you’re experiencing hair loss, it’s understandable to want to find a solution as quickly as possible. However, the most suitable treatment depends on what’s causing your hair to thin.
Some types of hair loss improve naturally, while others may benefit from medication, lifestyle changes or specialist treatment.
Minoxidil for Hair Loss
Minoxidil is a medication commonly used to treat hereditary hair loss in men and women. It’s available in topical formulations, including solutions and foams applied directly to the scalp.
Minoxidil may help slow hair loss and encourage regrowth in some people, although results vary.
It’s important to understand that:
- Visible improvements generally take several months.
- Some people experience temporary increased shedding when starting treatment.
- Not everyone responds to minoxidil.
- Continued use is usually necessary to maintain the benefits.
- Side effects can include scalp irritation and unwanted facial hair growth.
If you’re considering minoxidil, speak to a pharmacist or healthcare professional about whether it’s suitable for you.
Finasteride for Male Pattern Hair Loss
Finasteride is a prescription medication used to treat male pattern hair loss.
It works by reducing the conversion of testosterone into dihydrotestosterone (DHT), the hormone involved in shrinking genetically susceptible hair follicles.
Finasteride can help slow hair loss and encourage regrowth in some men, although it may take several months before improvements become noticeable.
However, it isn’t suitable for everyone and can cause side effects, including sexual dysfunction and mood changes.
Finasteride is not routinely recommended for women and must not be used during pregnancy.
Anyone considering this medication should discuss the potential benefits and risks with an appropriate healthcare professional.
Can Minoxidil and Finasteride Be Used Together?
For some men experiencing hereditary hair loss, a clinician may recommend using minoxidil and finasteride together.
Because the medications work through different mechanisms, combination treatment may be more effective than either medication alone for certain patients.
However, combining treatments isn’t appropriate for everyone, and potential side effects should be considered.
Always seek professional advice before starting or combining hair loss medications.
Hair Transplants
Hair transplantation may be an option for some people experiencing permanent hair loss, particularly hereditary pattern baldness.
The procedure involves moving healthy hair follicles from one area of the scalp to areas where hair has become thinner.
However, hair transplantation isn’t suitable for every type of hair loss, and results depend on factors such as the cause of hair loss, donor hair availability and the experience of the surgeon.
It’s important to have a proper diagnosis and understand the potential risks, costs and limitations before considering surgery.
Can Lifestyle Changes Help Prevent Hair Loss?
Although lifestyle changes cannot prevent hereditary hair loss, looking after your general health may help reduce shedding associated with certain triggers.
Helpful habits include:
- Eating a balanced diet containing adequate protein, iron and other essential nutrients.
- Avoiding crash diets and rapid weight loss.
- Managing stress and prioritising sufficient sleep.
- Being gentle when brushing and styling your hair.
- Avoiding hairstyles that repeatedly pull tightly on the hair.
- Seeking treatment for underlying medical conditions.
Remember that hair growth takes time. Even when the underlying cause has been addressed, it may take several months before noticeable improvements appear.
Frequently Asked Questions About Hair Loss
How Much Hair Loss Is Normal?
According to the NHS, losing between 50 and 100 hairs per day is normal. However, the amount varies depending on your hair type, washing routine and individual hair growth cycle.
If you notice significantly more shedding than usual, a widening parting or visible bald patches, it’s worth speaking to your GP.
Can Hair Grow Back After Thinning?
Yes, hair can sometimes grow back, depending on the underlying cause.
Temporary hair loss caused by stress, illness or nutritional deficiencies often improves once the trigger has been addressed.
Hereditary hair loss tends to progress over time, although treatments such as minoxidil may help slow thinning and encourage regrowth in some people.
Certain conditions that cause scarring of the hair follicles can result in permanent hair loss, making early diagnosis important.
Can Stress Really Cause Hair Loss?
Yes. Significant physical or emotional stress can trigger a condition called telogen effluvium, which causes more hairs than usual to enter the shedding phase.
Hair loss often becomes noticeable two to three months after the stressful event.
In many cases, shedding gradually improves once the underlying trigger has resolved.
Does Hair Loss Mean You Have a Vitamin Deficiency?
Not necessarily. Although deficiencies in nutrients such as iron and zinc can contribute to hair loss, there are many other possible causes.
Taking hair growth supplements without identifying a deficiency is unlikely to help and, in some cases, excessive supplementation can be harmful.
If you’re concerned about nutritional deficiencies, your GP can advise whether blood tests are appropriate.
At What Age Does Hereditary Hair Loss Start?
Hereditary hair loss can begin during the late teenage years or early adulthood, although it becomes more common with age.
Men may notice a receding hairline or thinning crown, while women often experience gradual thinning around their parting.
The age of onset and rate of progression vary considerably between individuals.
When Should I Worry About Hair Loss?
Although some hair shedding is completely normal, you should seek medical advice if you experience:
- Sudden or unexplained hair loss.
- Round or irregular bald patches.
- Scalp redness, pain, itching or scaling.
- Rapidly worsening hair thinning.
- Hair loss accompanied by fatigue, unexplained weight changes or other symptoms.
- Persistent shedding that causes concern.
A GP can help identify possible causes and recommend appropriate investigations or treatment.
Final Thoughts: Understanding Why You’re Losing Your Hair
Hair loss can be frustrating and sometimes upsetting, particularly when you’re unsure what’s causing it. However, it’s important to remember that thinning hair doesn’t always mean permanent hair loss.
From genetics and hormonal changes to stress, nutritional deficiencies and underlying medical conditions, there are many reasons why your hair might be shedding more than usual.
The key is understanding what’s happening rather than rushing into treatments that may not be suitable for your particular type of hair loss.
For some people, addressing an underlying health condition or making changes to their lifestyle may help improve hair growth. Others may benefit from treatments such as minoxidil, prescription medication or specialist advice.
If you’ve noticed persistent thinning, sudden shedding or changes to your scalp, speaking to your GP is a sensible first step.
Ultimately, everyone’s hair is different, and finding the right approach starts with understanding your individual circumstances.