Adam Frosh, Consultant Ear Nose and Throat Surgeon, has been quoted by IOL Lifestyle on an article about people who constantly have to clear their throat.
The article is here.
There are many causes, and it needs to be investigated. Often it is a totally suitable condition.
If you are suffering from this very distressing problem, please don’t hesitate to either get your GP to refer to see him on the NHS, or you can see him privately (contact details here).