Why do lemons and limes give you headaches?

How do you cure hog cholera? How is Swine Flu test done? Does having running nose mean you got HIv? Why do my toenails have ripples? Where on the retina should an object be focused for the best vision? What type of eye damage is caused by uv laser radiation? What is the first part of a digestive track called? What does chronic sniffing mean? Does your belly button ever come undone? What structure in the heart delays the electrical impulse momentarily to allow the ventricles to fill completely? Im 15 and have not started your period is this normal? What are the signs and symptoms of typhoid? What is a thyroid problem what are the effects how does it affect your eating habits and weight and any other info please BTW I'm 14 and might have this? What is the maximum time to check a pulse? How can the dangers of sunburn be reduced? What vein run adjacent to lt common carotid artery? What is the difference between Paint thinner acetone naphtha and lacquer thinner? Why are you immune to most diseases once you have been infected once or vaccinated? Is it a sign of pregnancy if your nipples are stinging? What are causes of irregular teeth?