My mum passed away a few months ago she had cancer that had spread to her lungs kidney and other parts. I cared for her at home she was initially taking oramorph but when the pain became too much they put her on a syringe driver. The next morning after she had the driver on I came into her room to find her foaming at the mouth it was like an oats porridge colour and thick texture. I immediately raised her bed and started cleaning her mouth and face . What was this and why did this happen she was still alive...