What’s the difference between hair shedding and hair loss?

Hair loss (anagen effluvium) occurs when something stops your hair from growing and may be permanent. It can occur due to genetics, an autoimmune reaction or as a side effect of some medications or other treatments. 

Hair shedding (telogen effluvium) is temporary and often caused by stress, illness, or hormonal changes. Once the cause is identified and treated or removed, your hair usually grows back within 3 to 6 months.