Hello, Five weeks ago i reached down for the shower to rinse my hair and i got a really horrible feeling in my neck/shoulder,
i took pain killers and over the course of two/three weeks the pain went , but then i started getting muscle spasm in my upper arm and my thumb went numb and it has been like this since ,
if i sit with my arm relaxed and slightly forward the muscle in the top of my arm, not my bisep starts to feel strange and then i get tingling down from there and the forearm and in my thumb, my tip of the of the thumb hasen't regained full feeling for almost two weeks although i do think its easing off .
Certainly a nerve entrapment / irritation syndrome. What's good is that it is slowly improving.
Never wash your hair in a basin, the shower is the place.
There are several places where the nerve could be affected. In the nerve root, in which case raising your arm above your head may likely relieve the tingling.
Or by the first rib, in which raising your arm may increase the tingling.
Or somewhere in your arm as well.
Do the Upper Limb Tension Test at C-H, and let me know what happens. Use the SiteSearch function. Adson's test for a "First rib syndrome" aka Thoracic Outlet syndrome, is rather difficult to do. It takes a lot of experience to do objectively.
Give it another week, not carrying anything heavy in that arm, and looking out for weakness and numbness in the arm. The triceps is most often affected. Avoid turning to the side and looking up.
Potentially this is a serious problem. It may resolve on its own with some common sense homecare, but if it doesn't, don't wait, get to see a local chiropractor. X-rays of your neck may be necessary.
Read the Pinched nerve in neck page at C-H.
Good luck, let us know in a few weeks how things progress.