People occasionally find that their hair still appears greasy after washing. There are several reasons why this could be happening, such as seborrhea or dietary habits.
Persistently greasy hair may be due to an overproduction of sebum, which can sometimes indicate an underlying health condition.
However, the way people wash and care for their hair, and the type of hair products they use, may be the cause.
This article explores possible causes, treatment, and prevention tips, and when to see a healthcare professional.
Overly greasy hair may be due to seborrhea, which is a relatively common skin condition. Seborrhea occurs when the sebaceous glands create excess oil, or sebum, making the skin and scalp oily.
Most people with seborrhea do not have any underlying health problems. However, some people may have an underlying condition, such as a hormone imbalance.
The type of hair a person has may also affect how greasy their hair becomes. Straight or fine hair is more likely to appear greasy than curly or thick hair. This is because sebum from the scalp can more easily cover the whole strand of hair if it is straight or thin.
If people are using oily or waxy hair products or not cleansing their hair thoroughly, it can cause a buildup of oil, skin cells, and sweat in the hair. This may make it still appear greasy after washing.
Oil may also come from items a person uses on their hair frequently, such as:
- hair towels
- hairbrushes or combs
- hats and scarves
These items can pick up sebum from the scalp when used regularly. Using them without washing them between hair washes may result in the hair becoming greasy faster.
Some evidence suggests that environmental factors may affect hair and scalp health. A 2019 study found that air pollution may increase the rate of sebum excretion, reduce skin moisture, and worsen the symptoms of chronic inflammatory skin diseases.
Diet may also play a part in excess sebum production. According to a
If scaly patches are also present, a person may have seborrheic dermatitis. Seborrheic dermatitis is a common skin condition. It can cause scaly, greasy patches on the scalp and skin. The scaly patches may itch or burn and may flake off.
Treatment for greasy hair can depend on the underlying cause. Managing excessive oil or changing hair care habits may help.
People with straight or fine hair that gets greasy quickly may need to wash their hair daily to remove excess oil. Using a clarifying shampoo occasionally may also help to remove excess residue and buildup.
Using products containing green tea may help manage greasy hair. A small 2016 study looked at the effects of a green tea hair tonic on oily hair in 20 healthy participants.
After 28 days of use, the green tea hair tonic significantly reduced oil on the scalp compared to the placebo and tonic base. The positive effects may be due to properties in green tea that help manage androgen conditions. However, more research is needed.
Some people may benefit from shampoos that contain anionic surfactants. Surfactants
- laureth sulfate
- lauryl sulfate
- sarcosines
- sulfosuccinates
However, anionics can also dry the hair out, which can increase the risk of breakage. People with dry, easily damaged, or dyed hair may need a milder shampoo.
The American Academy of Dermatology Association recommends that people wash their hair based on how often it gets dirty or oily. Someone with straight hair and an oily scalp may want to wash their hair every day, while people with textured, curly, dry, or thick hair may want to wash their hair at least once every 2 to 3 weeks as needed.
People may find the following tips helpful for preventing greasy hair after washing:
- use a clarifying shampoo and a lightweight conditioner, avoiding the roots
- avoid heavy oil or wax-based styling products, as these can add to residue and buildup
- regularly clean hairbrushes, combs, hair towels, pillowcases, and headwear
- try dietary changes, such as a low glycemic diet, to see if this reduces sebum production
If seborrhea is not improving with home treatments, people may want to speak with their doctor or dermatologist for further treatment and check if they have any underlying health issues, such as a hormone imbalance.
People may also consider seeing a dietitian if they think diet plays a role in excessive oil production.
A doctor or dermatologist may be able to prescribe hair products or medications.
Greasy hair after washing may be due to a person’s hair care routine, an overproduction of sebum, environmental factors, or underlying health conditions.
People may be able to stop hair from becoming greasy as quickly by using a gentle clarifying shampoo and lightweight, non-greasy hair products. If home treatments are not effective, people may want to consider speaking with their doctor or dermatologist for further treatment.