Oily Hair: Why Does My Hair Get Greasy So Quickly & What Can I Do About It?

You wash your hair, style it, enjoy perfectly fresh roots… and then seemingly overnight, the grease is back.

If your hair becomes oily quickly, you’re certainly not alone. Greasy hair is usually caused by excess sebum – the natural oil produced by the sebaceous glands in your scalp. Sebum itself isn't a bad thing; it helps protect and lubricate the scalp and hair. The problem comes when your scalp produces more than your hair needs, or when oil combines with sweat, dead skin cells and product build-up.

The good news? The right scalp routine can make oily hair much easier to manage.

Why Does My Hair Get Greasy So Quickly?

There isn't one single cause of oily hair, and sometimes several factors are working together.

1. Your Scalp Naturally Produces More Oil

Some people simply have more active sebaceous glands than others. Genetics and hormones both influence how much oil your scalp produces, so your naturally oily roots may have very little to do with how well you're washing your hair.

2. Hormonal Changes

If your hair suddenly seems oilier than it used to, hormones could be contributing.

Hormonal fluctuations can affect sebum production, which means you may notice changes during puberty, pregnancy, your menstrual cycle or around menopause. Stress and medications that affect hormone levels can also influence how oily your hair becomes.

3. Fine or Straight Hair Can Look Greasier Faster

Hair type makes a surprisingly big difference.

Sebum can travel more easily from the scalp along straight or fine strands than through thicker, curlier hair. This means fine hair can begin looking oily and separated relatively quickly, even when the scalp isn't producing an unusual amount of oil.

4. Product Build-Up

Dry shampoo, styling creams, oils, serums, hairspray and even conditioner can gradually accumulate around the roots.

When this build-up combines with natural sebum and sweat, hair can begin feeling heavy, flat and greasy. If you're a regular styling-product user, introducing an occasional clarifying shampoo can make a noticeable difference.

5. You're Applying Conditioner Too Close to the Roots

Unless you're using a conditioner specifically designed for scalp application, concentrate it through the mid-lengths and ends.

Oily scalps generally don't need rich conditioners or masks applied directly to the root area.

6. You're Touching or Brushing Your Hair Frequently

Constantly running your hands through your hair can transfer oils onto the strands, while frequent brushing distributes your scalp's natural oils further through your hair.

Our Favourite UK Beauty Club Products for Oily Hair

Rather than trying to strip every trace of oil from your scalp, concentrate on cleansing effectively, reducing build-up and keeping the scalp balanced.

Oway Sebum Balance Hair Bath

One of our top choices for a genuinely oily scalp.

Oway Sebum Balance Hair Bath is specifically formulated to purify oily scalps and help regulate excess sebum. Its targeted formula uses a co-surfactant enhanced with zinc salts to help normalise the scalp while cleansing away excess oil.

UK Beauty Club recommends it for:
Hair that becomes greasy very quickly, oily roots and anyone looking for a more targeted scalp-balancing shampoo.

Oway recommends using it around 1–2 times per week, making it easy to alternate with a regular shampoo.

For particularly oily scalps:

Oway Hydro-Balance Scalp Gel

Take your scalp routine one step further with Oway Hydro-Balance Scalp Gel.

This targeted pre-shampoo treatment is applied directly to a dry scalp and left for around 15–20 minutes before cleansing with Sebum Balance Hair Bath or Frequent Use Hair & Scalp Bath.

Think of it as skincare for your scalp rather than simply another hair product.

Paul Mitchell Shampoo Two

If your roots feel coated rather than simply oily, clarifying may be what you're missing.

Paul Mitchell Shampoo Two is a deep-cleansing clarifying shampoo designed to remove excess oil, styling-product residue and mineral build-up, leaving hair feeling cleaner, lighter and fresher. Paul Mitchell specifically recommends it for greasy roots and heavier build-up.

UK Beauty Club recommends it for:
Heavy product users, stubborn greasy roots and anyone who feels like their normal shampoo isn't quite getting their hair clean enough.

Paul Mitchell Tea Tree Special Shampoo

Greasy, congested scalp? This is another excellent option.

Paul Mitchell Tea Tree Special Shampoo combines tea tree, peppermint and lavender for an invigorating cleanse that helps remove impurities and product build-up while leaving the scalp feeling incredibly fresh.

UK Beauty Club recommends it for:
Oily or flaky scalps, frequent product users and anyone who loves that fresh, cooling, just-washed feeling.

Bumble and bumble Sunday Clarifying Shampoo

Sometimes your hair simply needs a reset.

Bumble and bumble Sunday Clarifying Shampoo is a weekly clarifying cleanser designed to remove product residue, excess oil and pollutants that can accumulate throughout the week and leave hair looking dull or weighed down.

UK Beauty Club recommends it for:
Greasy roots combined with styling-product build-up, particularly if your hair starts feeling heavy or flat towards the end of the week.

Good to know: Bumble and bumble advises that Sunday Shampoo isn't suitable for colour-treated hair.

Aveda Scalp Solutions Balancing Shampoo

If you want effective oil removal without leaving your scalp feeling stripped, Aveda Scalp Solutions Balancing Shampoo is a brilliant everyday option.

Plant-derived cleansing agents remove excess oil, impurities, pollution and product build-up while the non-drying formula helps maintain scalp hydration. It's suitable for normal-to-oily scalps and can be used daily or as often as required.

UK Beauty Club recommends it for:
Anyone who needs to wash frequently but wants a gentle, scalp-focused cleanser.

Aveda Scalp Solutions Exfoliating Scalp Treatment

We exfoliate our faces – so why do we so often forget about our scalps?

Aveda Scalp Solutions Exfoliating Scalp Treatment uses wintergreen-derived salicylic acid to remove oil and product build-up. Aveda reports that the treatment can instantly reduce scalp sebum by 76%.

Use it as a pre-shampoo treatment to give oily, congested roots a deeper reset.

Should You Wash Oily Hair Every Day?

There's no universal rule that says you need to "train" your hair to go longer between washes.

How frequently you need to shampoo depends on your scalp, hair type, lifestyle and the products you use. In fact, daily washing can be perfectly reasonable for some oily scalps – what's important is choosing a cleanser suitable for frequent use rather than continually using an unnecessarily harsh shampoo.

If your hair needs washing every day, wash it. If you're comfortable going two or three days, that's fine too.

The goal should be a clean, comfortable, balanced scalp, not achieving an arbitrary number of days between washes.

When Is the Best Time to Apply Dry Shampoo?

Here's where most of us have been getting dry shampoo wrong.

We tend to reach for it after our hair has already become greasy.

A better strategy is to use it before your roots become noticeably oily.

Dry shampoo works by absorbing oil rather than actually cleansing the scalp, so treating it as an oil-management product rather than an emergency rescue product can give better-looking results. Dermatologists also stress that dry shampoo shouldn't replace washing with shampoo and water.

Try the Overnight Dry Shampoo Trick

If you know your freshly washed hair normally becomes greasy the following day, try applying a small amount of dry shampoo to clean, dry roots before bed.

Working ahead of the oil can help your dry shampoo absorb sebum as it appears rather than trying to tackle already-saturated roots the following morning.

Massage it lightly through the root area and leave it overnight. In the morning, brush through and style as normal.

You can still add a little more where needed, but start small – overloading your scalp with dry shampoo can create exactly the kind of build-up you're trying to avoid.

Aveda Shampowder™ Dry Shampoo

For extending the time between washes, we love Aveda Shampowder™ Dry Shampoo.

The non-aerosol powder formula uses plant powders, including montmorillonite clay and tapioca starch, to absorb excess oil, impurities and sweat while adding volume and texture. It's also 99% naturally derived and vegan.

It's particularly useful for fine, oily hair because absorbing oil at the root can simultaneously help restore some of the volume that disappears as hair becomes greasy.

Oway Plant & Mineral Refresh

For an alternative way to refresh oily roots between washes, Oway Plant & Mineral Refresh is a great addition to your routine.

This plant and mineral-based dry shampoo helps absorb excess oil and refresh the hair and scalp without the need for water, helping roots look cleaner, lighter and more voluminous. It's particularly useful for extending your style between wash days while giving flat or oily roots a quick refresh.

UK Beauty Club recommends it for:
Oily roots, fine or flat hair and anyone looking to extend the time between shampoos with a quick, convenient refresh.

UKBC Tip: Don't wait until your hair looks very greasy. Try applying a small amount to the roots before bed on the night you expect your hair to become oily. This gives the powder time to absorb excess oil as it develops overnight, helping you wake up with fresher-looking roots.

The UK Beauty Club Oily Hair Routine

If greasy roots are an ongoing battle, try simplifying your routine:

Wash: Choose a scalp-focused shampoo such as Oway Sebum Balance Hair Bath, Aveda Scalp Solutions Balancing Shampoo or Paul Mitchell Tea Tree Special Shampoo.

Deep Clean: Introduce a clarifying shampoo such as Paul Mitchell Shampoo Two or Bumble and bumble Sunday Clarifying Shampoo when build-up is an issue.

Treat: Add a targeted scalp treatment such as Oway Hydro-Balance Scalp Gel or Aveda Scalp Solutions Exfoliating Scalp Treatment.

Condition Carefully: Keep richer conditioners and masks focused mainly on the mid-lengths and ends unless they're specifically formulated for scalp use.

Refresh: Use a small amount of dry shampoo between washes – ideally before your hair reaches peak grease rather than repeatedly layering it onto very oily roots.

And remember: more product isn't necessarily better. A simple, scalp-focused routine can often be far more effective than continually adding products in an attempt to disguise oily roots.

The Bottom Line

Oily hair isn't a sign that your hair is dirty or that you're doing something wrong.

Your scalp naturally produces sebum, and genetics, hormones, hair type, lifestyle and product build-up can all influence how quickly that oil becomes visible.

Instead of fighting your scalp, work with it.

Cleanse according to how frequently your hair genuinely needs it, introduce clarifying or exfoliating products when necessary, avoid weighing down your roots and use dry shampoo strategically between washes.

With the right routine, you might just find that Day Two Hair becomes your new favourite hair day.