Hi KeithSorry - I had misread that which was bugging you the most, i.e. it is actually the site of the twitching that irks you as much as its relentlessness. Having reread the thread, I think I am right in saying that it is worriesome to you in terms of re-activating your fear of a dread disease like MND/ ALS, rather than worriesome in terms of being simply fed up of this particular benign twitch. If so, you will note that I have just posted a parallel topic about my thumb, describing my illogical belief that the fasciculation in this one particular body site is going to herald the 'beginning of the end' of life as I know it. I guess we are equally illogical in this belief but I can attest to just how real this illogical fear is. If it is any comfort, when I went to the neurologist in August to discuss my last EMG, which showed denervation/ reinervation in my L quads, she told me that of the many hundreds of MND/ ALS cases she had seen, the upper leg had never once been the starting point (i.e. quads in my case/ hamstrings in your case) although this had been described as an incredibly rare occurence in the MND literature. Limb onset MND is much more likely to present peripherally - i.e. hands (weak grip, dropping things...) / lower legs (foot drop, trippling...). So, in terms of its location, I think your current fasciculation is in a place that is by far moe likely to be of a benign nature than not. Hope this helps. II wish I could apply the same logic about my wretched thumb which has been hard out twitching for several weeks and is, after all, a more peripheral location.All the bestSimon