Random and Rapid hair loss?

I had noticed here and there that I did lose a great deal of hair when brushing and washing my hair, however my hair is EXTREMELY thick so I never thought much of it. However tonight after washing my hair and not even running a brush through it yet, wads and wads of hair have been coming out huge chunks are coming out. What can cause this to happen, and to happen so rapidly...like after one wash? I haven't used anything different on my hair, no new shampoos, gels or sprays.Random and Rapid hair loss?
Go to your doctor , if your under stress it could be alopecia.Random and Rapid hair loss?
eat healthy