While vaccines involving a live element are often contraindicated while having chemo, because your immune system is weakened, an exception is often made for ‘flu vaccines. Any other underlying condition could hVe an impact. As always, check with your GP or oncologist. While I am still on hormonal therapy, I am many years post chemo - I’ve had several flu shots, meningitis and shingles shots, all with no side effects at all. Each time, nurses have run through a checklist but your own doctor will know best. The more of us who can be vaccinated against this miserable virus, the better!