Partial or complete loss of hair is called alopecia. It can be hereditary, stress-induced, or caused by autoimmune conditions, such as lupus. Other causes of hair loss, especially if it is in an unusual pattern, include:
- Alopecia areata (bald patches on the scalp, beard, and, possibly, eyebrows; eyelashes may fall out)
- Anemia
- Burns
- Certain infectious diseases such as syphilis
- Excessive shampooing and blow-drying
- Hormone changes
- Thyroid diseases
- Nervous habits such as continual hair pulling or scalp rubbing
- Radiation therapy
- Tinea capitis (ringworm of the scalp)
- Tumor of the ovary or adrenal glands
Source: NIH.gov
