What could cause this?
121895
You've got too much sulfur in the water. It stinks, but actually it's good for you. The reason it has too much sulfer may be due to your water company or it could be due to your pipes. I think you can call water testing people and they can check all that stuff for you.
481165
It could be caused by any number of things--low blood sugar, dehydration, bad blood circulation, allergies, or some problem in the brain.  If it persists, ask a doctor.
126257
possibilities include:\nvirus, trojan , malware etc.\nsystem admin changed some settings.
588981
It seems there's a variety of things that can cause this.  If you go the link below, you'll see a number of different things people did to resolve this issue, especially on page 2.
411607
NO.  This needs to be checked out by the doc as it could be something serious.  This should have been checked out a long time ago.
519736
could be nothing more than irritation from barometric changes. there my be nothing you can do for it. it could also be ecxima
559570
IT COULD BE STRESS OR ANXIETY
473496
It can be several things. The most probable is magnesium or potassium deficit or restless leg syndrome
541733
possibly an allergic reaction to something.  You need to be seen in the emergency department pronto.
204674
You should consult a medical professional.  There are lots of illnesses that could cause those symptoms, but it's better not to self diagnose.
248201
It could be. Talk to your doctor!
573819
you should see a doctor about this
45192
definitely go and see your doc it could be an infection.
18494
It may be panic attacks, not always a known cause as to why the occur..can be in subconscience. I'd talk to your DR
591025
go to the doctor it may be serious!
499800
Stress usually causes these things!!\nget some Zovorax!!!
184690
See a Doctor it could be something serious.