A bad diet, infection, or slow metabolism can produce dandruff, which is characterized by scaly particles that attach to the hair base.
Although traditionally associated with men, hair loss/thinning hair is also common in women. Most men may have male pattern baldness.
Shampooing too often dries hair. Many wash their hair daily, sometimes twice, even though clean hair is good. Your hair will lose all its natural oils.
Split ends result from overbrushing, perming, heat, and poor conditioner.
The scalp produces too much sebum, causing oily hair. Sebaceous glands might "work overtime" and create too much oil.
Frizzy hair is caused by poor hair moisture and might be hereditary.
Chemical or heat-styling damage and environmental pollution can darken hair.
Overusing your curling or flat iron will harm your hair.
Chemicals open your hair shaft when you color it, making it porous and fragile.
Gray hair is a status symbol for many. Gray hair is brittle and unmanageable, so some opt to remove it.