Alopecia areata:
Sudden hair loss that starts with one or more circular bald patches that may overlap.
Alopecia occurs when the immune system attacks hair folicles, and may be brought ont by severe stress.
Hormonal imbalance:
- In women androgens can cause weak hair folicles, also leading to excessive shedding. Male baldness is related to an increase in an androgen called dihydrotestosterone (DHT).It binds to the hair folicles and stops hair growth.
Thyroid:
Either an underactive or overactive thyroid can result in hair loss because each condition causes a hormonal imbalance.
Pregnancy;
Estrogen levels skyrocket during pregnancy, which can temporarily alter your hair growth cycles. During this time, you're likely to experience less hair loss than nromal.
Medications:
This is also known as "drug-induced hair loss" A number of medications taken for common health problems can cause this blood-thinning, depression, anti-inflammatories, calcium channel blockers, vitamin A.
Stress"
Hair loss can be triggered by an intense amount of stress, such as developing an illness, undergoing surgery, lossing someone. 70 percent of hair folicles go into a resting state compared to the estimate 10/20 percent normally in the telogen state.