I'm sorry to hear your mum is fighting cancer. I am 48 and was diagnosed 20 months ago with stage 4 kidney cancer. How did that happen? I didn't have any symptoms until just before I was diagnosed. My symptoms were tummy ache that came and went a slight change in the colour of my stools and weight loss but it was only just before diagnosis that these symptoms occurred. I was in total shock and angry to be told that a CT scan showed a 12 cm cancerous tumour on my kidney which had spread to my lungs! Unbelievable. I lost my mum 4 years ago to kidney cancer that spread to her bones, the same cancer. However my mums was found really late and aged 72 her first symptoms were a fractured pelvis!! The cancer caused bones to break! I get angry that my cancer wasn't found sooner but how could it be if I had felt well and kept fit beforehand? Like your mum finding mine was so unexpected but advanced she  found. I used to worry I would die but now 20 months later I am feeling fairly well. 
It wasn't always like this at first I was really ill with immunotherapy and was in an out of hospital and my daughter who is 27 was devastated thinking I was dying. Now I have discovered my treatment isn't working well enough and am currently waiting for a  suitable clinical trial to hopefully control the cancer now growing on my lungs. I feel positive against all the odds and am hopeful that although my cancer may not be curable but can be managed for a few years yet. The problem with cancer is it's often not found until the cancer is advanced but hopefully my age and level of fitness will help and help your mum too. Try and be positive and just be there for your mum.

I'm sorry to hear your mum is fighting cancer. I am 48 and was diagnosed 20 months ago with stage 4 kidney cancer. How did that happen? I didn't have any symptoms until just before I was diagnosed. My symptoms were tummy ache that came and went a slight change in the colour of my stools and weight loss but it was only just before diagnosis that these symptoms occurred. I was in total shock and angry to be told that a CT scan showed a 12 cm cancerous tumour on my kidney which had spread to my lungs! Unbelievable. I lost my mum 4 years ago to kidney cancer that spread to her bones, the same cancer. However my mums was found really late and aged 72 her first symptoms were a fractured pelvis!! The cancer caused bones to break! I get angry that my cancer wasn't found sooner but how could it be if I had felt well and kept fit beforehand? Like your mum finding mine was so unexpected but advanced she  found. I used to worry I would die but now 20 months later I am feeling fairly well. 
It wasn't always like this at first I was really ill with immunotherapy and was in an out of hospital and my daughter who is 27 was devastated thinking I was dying. Now I have discovered my treatment isn't working well enough and am currently waiting for a  suitable clinical trial to hopefully control the cancer now growing on my lungs. I feel positive against all the odds and am hopeful that although my cancer may not be curable but can be managed for a few years yet. The problem with cancer is it's often not found until the cancer is advanced but hopefully my age and level of fitness will help and help your mum too. Try and be positive and just be there for your mum.