Baldness implies no hair on the head. In humans, baldness generally means androgenic alopecia or "male pattern baldness" or its variant "female pattern baldness". This syndrome occurs in adult male and some female humans and other species. The degree and pattern of baldness can vary greatly; it includes male and female pattern alopecia (androgenic alopecia). This syndrome is also called androgenetic alopecia or alopecia androgenetica. An older term is alopecia seborrheica, used primarily in Europe.
hair loss causes
Lack of vitamins, insufficient nutrition
The most vital cause of hair loss is insufficient nutrition. Persons lacking in vitamin B6 lose their hair and those lacking in folic acid often become totally bald. But the hair grows generally after the liberal intake of these vitamins.
Stress, Prolonged Illness, impure conditions
Other important causes of hair loss are stress such as worry, anxiety, and unexpected shock, general weakness caused by severe or long standing illnesses like typhoid, syphilis, chronic cold, influenza, and anaemia; an unclean situation of the scalp which weakens the hair roots by jamming the pores with the collected dirt; and heredity