My dad (58yo) has informed me today that his GP has referred him for an endoscopy because he suspects cancer. He's lost 3kg in 3 months and medication that was prescribed to him for all his symptoms isn't making a difference. This weekend has been particularly bad and he hasn't been able to eat and has been sick several times.
Please may I ask (in your experience), how likely it could be that it's cancer? The appointment is in 2 weeks (wouldn't it be sooner if they suspected cancer). He's had these symptoms for around 6 months ish (I think).
What else could it be if medication isn't working or is it normal for medication not to have an affect?