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Why Does My Hair Get Greasy? Experts Explain
Genetics, hormones and lifestyle can all play a role in how oily your hair gets, but there are ways to combat it.
Jan. 29, 2026 at 12:47pm
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If your hair always seems to look and feel greasy no matter how much you wash it, you're not alone. It's a common struggle with plenty of potential culprits, including your hair and scalp type, hormones and genetics. To learn more, the author spoke to three trichologists and dermatologists about common causes, treatments and misconceptions around greasy hair, and rounded up their product recommendations that can help clean your hair without stripping it.
Why it matters
Oily hair is often misunderstood as a hygiene issue, when it's really about scalp biology. Understanding the root causes and using the right products can help regulate oil production and maintain a healthy scalp and hair.
The details
Overactive sebaceous glands on the scalp that produce excess oil (called sebum) to protect your hair and skin are the most common cause of greasy hair. Genetics, hormonal fluctuations, stress and lifestyle habits like frequent touching or brushing can trigger this. Those with fine hair tend to show oil more quickly because there's less surface area and cuticle layer to absorb it. Over-washing with harsh, stripping formulas can also stimulate the scalp to produce more oil to protect itself.
- The author spoke to the experts in January 2026.
The players
Aga Tompkins
A board-certified trichologist.
Sara Hallajian
A trichologist and founder of Ame Salon in Santa Monica, California.
Dr. Hadley King
A board-certified dermatologist.
What they’re saying
“Oil itself isn't bad, it's actually essential for a healthy scalp.”
— Aga Tompkins, Board-certified trichologist (nbcnews.com)
“Treating oily hair is less about 'drying it out' and more about balancing and regulating scalp function.”
— Sara Hallajian, Trichologist and founder of Ame Salon (nbcnews.com)
The takeaway
Understanding the root causes of greasy hair and using the right products that gently remove buildup without stripping the scalp can help regulate oil production and maintain a healthy head of hair.
