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There are those (including myself) on this, and other similar forums, that get plenty of useful advice about many aspects of running and fitness, etc. But without trying to sound patronising, I would just like to pass on my own salutory term regarding health/medical advice.
I am 57 yrs old, and had "let myself go" after being previously relatively fit with several half and full marathons experience in my early 50's. I started last April to try and get back to something like my fitness levels of a few years ago and had the goal of entering the Robin Hood Half Marathon in September.
I took things fairly conservatively, but progressed well, but in May I started to get a sore groin/upper-thigh area.
I embarked on a "self diagnosis" via the internet forums after reading the posts of many very well intentioned people or had experience of such injuries/issues.I took into account when the pain got worse, or eased off, etc,etc. I came to the conclusion that I should not run through the injury, lest I cause further damage, and took a rest from running for over a month. This was overwelmingly the conclusion from most people giving advice. Sadly, the soreness returned almost immediately.
So I decided to see a physio through my GP which , but it was apparent that I would not be able to make the half marathon as planned.
I fully expected the physio to tell me to lay off running for a further period of time and so was not looking forward to the prospect of almost having to start again in my quest to fitness 1 or 2 months later. Instead, she said that I was running with a slight inbalance in the strength of the relevant muscles and a real lack of flexibility down the back of my legs ( I spend all day sat at a desk or in the car). She gave me a group of simple exercises to do, several times a day for two weeks and said I should carry on running.
The soreness disapeared altogether after the 2 weeks, and I have had no issues since.
My physio said that groin problems can be one of around a dozen issues, many of which do not require a rest, merely strengthening and stretching. I am not going to give details of where the injury was, or the excercises, as that will go against what my message is.
Which is that we should not self diagnose an injury in complicated body areas such as knees, ankles and groins. Get proper medical advice.