Sometimes it prevents problems, which also causes problems.
Vaginal and vulvar cancers are usually caused by the human papillomavirus, which also causes cervical cancer.
My eyes felt sore, a result of dry eye, which also causes sporadic blurriness.
The guest appearances of the sun is one – but one which also causes mass upheaval to any student's schedule.
The most severe form of mange is caused by varieties of the mite Sarcoptes scabiei, which also causes human scabies.
Researchers believe that SARS is caused by a virus from the corona family, which also causes a third of all common colds.
It was impossible to read his face, because his expressions have been muted by Parkinson's disease, which also causes an almost constant trembling in his hands.
The Marriott was later cleared, with the players apparently having gone down with an untimely dose of norovirus, or winter vomiting disease which also causes diarrhoea.
While fragile X is the most common inherited cause of mental retardation, Down syndrome — which also causes retardation — is more common but is not inherited.
A defective version of a gene called RPE65 means that, in this condition, retinal cells are starved of vitamin A, which also causes blindness.
Shingles occurs when the varicella zoster virus, which also causes chickenpox and can lie dormant in nerve cells for decades, reactivates to cause a painful rash.
