And it is taking its toll - 46 per cent struggle to sleep, 28 per cent have developed mental health problems and 18 per cent are unable to work.
The study of 2,000 adults found 82 per cent have a minor health condition, with 59 per cent in significant discomfort from problems such as back pain and headaches.
Sufferers do not seek help because they feel their GP is not interested, they cannot get an appointment or they do not like going.
The research found the typical adult has taken seven days off work in the past year. But nearly 60 per cent said they have worked on despite feeling too ill.
Reasons include not liking taking time off, having too much work to do and not wanting to acknowledge there was a problem.
And 52 per cent said it has never crossed their mind to visit a chemist for advice, said OnePoll's survey for Perrigo. Farah Ali, pharmacist at Warman-Freed, said: "Always seek the advice of a healthcare professional for any prolonged condition.
"Pharmacists are experts in minor health conditions providing self-care solutions. They can offer clinical advice and they'll signpost you if you need to see a GP, nurse or other healthcare professional."