HELP....hairs fallin out!!!!!!!!!?

Not mine! My mums...shes not that old but her hairs fallin out. It's all the time, even just sittin around,when she watches TV! She's lucky she had thick hair but its so bad that she's nearly goin bold...and its really upsetting her. I wanna help so Im asking you guys....please help, does anyone know anything/anyway to stop it, and maybe some regrowth?