Is there a connection between an itchy scalp and hair loss?

For the past few months I started to notice significant hair loss. I began a treatment with argan oil and the hair loss stopped. After a while the hair began to fall excessively and it started to worry me. There is hair all over my house, car, clothes, etc. Also, my scalp started to itch mostly in the evenings before bed. Could the hair loss cause the itchiness of the scalp or vice versa? Is there a connection between the two?