This is normal, not a disorder. The scalp produces oil; the roots are right next to the supply and the ends are two years' walk away. Long or textured hair makes the gap wider.
The mistake is treating the whole head as one thing.
Why the usual approaches fail
Washing more often to control the roots dries the ends further and can push the scalp to produce more oil.
Using rich products for the ends inevitably reaches the roots and makes them greasy sooner.
Compromising with a "normal hair" product treats neither problem.
Treat the zones separately
Scalp and roots:
- A mild shampoo, lathered at the scalp only
- Fingertips, not nails, for about a minute
- Nothing rich anywhere near the roots — no conditioner, mask, oil or leave-in
- Rinse very thoroughly; residue makes roots greasy faster
Lengths and ends:
- Conditioner every wash, mid-length down
- A mask once or twice a week instead of conditioner
- A leave-in cream or a drop of oil on damp ends
- Regular trims
That is one routine with a dividing line, not two routines.
Washing frequency
Every other day suits most people with this pattern. If you currently wash daily with a strong shampoo, stepping down gradually often reduces oiliness over a few weeks — with an awkward adjustment period.
Between washes, dry shampoo at the roots works as a stopgap, up to two days running.
Small things that help
- Wash your hairbrush. It carries oil from roots to lengths every time you use it
- Stop touching your hair through the day
- Cooler water, and a cool final rinse
- Tie hair up loosely at night to keep ends off skin
- Clarify monthly if you use styling products
When it is more than this
Persistent flaking, itching or soreness at the scalp alongside oiliness may be seborrhoeic dermatitis rather than plain oily scalp — that needs treatment rather than a different shampoo, and a doctor is the right route.
For products for each zone, see the shampoo guide and the hair mask guide.