There are various causes of hairfall.-
Hormonal changes. Hormonal changes and imbalances - temporary hair loss.
Patchy hair loss- Immunological alteration
Scalp infections. -Fungal infections
Permanent loss - Scarring alopecia in lichen planus,lupus and sarcoidosis.
Hair-pulling disorder- trichotillomania
Medications
- Hormonal contraceptive
- Cancer Chemotherapy
etc
- Radiation therapy to the head.
- A trigger event- Stress including sudden or excessive weight loss, a high fever, surgery, or a death in the family.
-Certain hairstyles and treatments.
-Excessive hairstyling -traction alopecia
- Hot oil hair treatments