I do not know if it is a side effect of the radiotherapy. But I would definitely get in touch with the medical team that looked after you or go to your GP.
Were you coughing up a lot of blood? Coughing up blood can also be due to chest infection as that was what was said to me before I was diagnosed.
Will keep fingers crossed for you but defo go and speak to someone.
Radiotherapy is delivered for both curative and palliative/supportive treatment which is why you'll find references to both online. SABR (ablation radiotherapy sometimes called cyber knife) has success rates almost equal to surgery in those whose tumours can't be surgically removed. The problem with the internet is that there is information overload, no sifts or filters and everything comes up - so for those with a little knowledge but lots of passion and curiosity it can be fraught with danger! We can frighten ourselves to death. Much of the information is outdated and also includes all cancers not just lung cancer and even less likely the specific about our personal tumours. I'd urge all patients to discuss their own situation with their own clinicians who should have the biological information about your own tumour, your staging (i.e. the size/spread of the tumour) and the pathological information about any specific markers/mutations within your tumour or your own genome which together with your own physical health (which varies from patient to patient dependent on any other conditions we may have) and our own general fitness before diagnosis, all contribute to the way we are treated. Your oncologist has this information - the internet doesn't.
I coughed up blood 2 weeks ago during a violent coughing fit and thought (as I had a left upper lobectomy in December 2010, diagnosed as lung cancer in Jan 2011) that this might be the return but no, it turns out that I had a respiratory virus that had me isolated in hospital for 5 days. It's hard not to think that every symptom is the cancer returning but most of the time it isn't. I found a book really helpful to reassure me in the early months after surgery on this - called 'cancer is a word not a sentence' by Dr Rob Buckman as it helped me put symptoms into context. Not saying that you shouldn't follow up - but if you can stop your mind jumping to the conclusion that everything is the return of the cancer, it might help you focus on recovering your life. Good luck and hope they get it sorted - whatever it is.
I would consult your medical team if I were you. Every case is different and they know you. Though coughing up blood is distressing, it may not be serious. It might be a side effect of medications or treatment. Consult the experts before panicking. This is a bumpy road we're on and we need correct information.
Jean why do my bones ache? I finished 3 rounds of chemo in June and I was told met and cancer free 90 days ago but my bones hurt bad like arthritis maybe this is the new normal I’m stage 4 and it spread to my brain and they removed it over a year ago
As JanetteR57 has mentioned in her reply radiotherapy can be a curitive treatment, have a chat with your specialist nurse and she will be happy to talk things over with you, I would mention the coughing up blood as others have said it can be a frightening symptom that can have varied causes and the team whose care you are under will be able to advise you. I have added below a link to our radiotherapy booklet which may be of interest to you.
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So worried and scared :-( 
Not so good/not so bad
Any input/advice please on radiotherapy post immunotherapy? 
I'm confused & a little scared!
