Neck manipulation has been shown to be safe and effective and benefits thousands of people suffering from neck pain and headaches. In fact, the risk of a stroke after treatment is the same whether you see a GP and get a prescription, or see a chiropractor and get your neck adjusted. (http://www.ncbi.nlm.nih.gov/pubmed/18204390)
Manipulation of the neck is at least as effective as other medical treatments and is safer than many of the drugs used to treat similar conditions. (http://www.ncbi.nlm.nih.gov/pubmed/17258728)
The term chiropractic is often mis-used for treatment carried out by non-chiropractors. This leads to over-reporting of incidents blamed on chiropractors, including in the BMJ. In one report of 24 cases attributed to chiropractors, not one was shown to be a chiropractor. (http://chiromt.com/content/14/1/16#B21)
Chiropractors are highly trained in spinal care and manipulation. In one UK study undertaken in 2007, of 50,000 neck treatments reviewed, not one single adverse event was reported. (http://www.ncbi.nlm.nih.gov/pubmed/17906581)
The cherry-picking of poor quality research needlessly raises alarm in patients and does little to help people suffering from neck pain and headaches to choose the most appropriate treatment.
I hope that this has allayed any fears or worries about the safety and efficacy of spinal manipulation when carried out by a trained, professional pair of hands. However, should you have any further concerns or queries - please, just ask!